Both functions that update global counters use the same mechanism. Create a function that contains the common code. Signed-off-by: Christoph Lameter <cl@linux.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> CC: Tejun Heo <tj@kernel.org> Cc: Joonsoo Kim <js1304@gmail.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1454 lines
35 KiB
C
1454 lines
35 KiB
C
/*
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* linux/mm/vmstat.c
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*
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* Manages VM statistics
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* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
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*
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* zoned VM statistics
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* Copyright (C) 2006 Silicon Graphics, Inc.,
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* Christoph Lameter <christoph@lameter.com>
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*/
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/cpu.h>
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#include <linux/vmstat.h>
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#include <linux/sched.h>
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#include <linux/math64.h>
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#include <linux/writeback.h>
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#include <linux/compaction.h>
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#ifdef CONFIG_VM_EVENT_COUNTERS
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DEFINE_PER_CPU(struct vm_event_state, vm_event_states) = {{0}};
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EXPORT_PER_CPU_SYMBOL(vm_event_states);
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static void sum_vm_events(unsigned long *ret)
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{
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int cpu;
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int i;
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memset(ret, 0, NR_VM_EVENT_ITEMS * sizeof(unsigned long));
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for_each_online_cpu(cpu) {
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struct vm_event_state *this = &per_cpu(vm_event_states, cpu);
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for (i = 0; i < NR_VM_EVENT_ITEMS; i++)
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ret[i] += this->event[i];
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}
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}
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/*
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* Accumulate the vm event counters across all CPUs.
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* The result is unavoidably approximate - it can change
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* during and after execution of this function.
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*/
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void all_vm_events(unsigned long *ret)
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{
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get_online_cpus();
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sum_vm_events(ret);
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put_online_cpus();
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}
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EXPORT_SYMBOL_GPL(all_vm_events);
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/*
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* Fold the foreign cpu events into our own.
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*
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* This is adding to the events on one processor
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* but keeps the global counts constant.
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*/
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void vm_events_fold_cpu(int cpu)
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{
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struct vm_event_state *fold_state = &per_cpu(vm_event_states, cpu);
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int i;
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for (i = 0; i < NR_VM_EVENT_ITEMS; i++) {
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count_vm_events(i, fold_state->event[i]);
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fold_state->event[i] = 0;
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}
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}
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#endif /* CONFIG_VM_EVENT_COUNTERS */
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/*
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* Manage combined zone based / global counters
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*
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* vm_stat contains the global counters
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*/
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atomic_long_t vm_stat[NR_VM_ZONE_STAT_ITEMS] __cacheline_aligned_in_smp;
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EXPORT_SYMBOL(vm_stat);
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#ifdef CONFIG_SMP
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int calculate_pressure_threshold(struct zone *zone)
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{
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int threshold;
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int watermark_distance;
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/*
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* As vmstats are not up to date, there is drift between the estimated
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* and real values. For high thresholds and a high number of CPUs, it
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* is possible for the min watermark to be breached while the estimated
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* value looks fine. The pressure threshold is a reduced value such
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* that even the maximum amount of drift will not accidentally breach
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* the min watermark
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*/
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watermark_distance = low_wmark_pages(zone) - min_wmark_pages(zone);
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threshold = max(1, (int)(watermark_distance / num_online_cpus()));
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/*
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* Maximum threshold is 125
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*/
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threshold = min(125, threshold);
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return threshold;
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}
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int calculate_normal_threshold(struct zone *zone)
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{
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int threshold;
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int mem; /* memory in 128 MB units */
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/*
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* The threshold scales with the number of processors and the amount
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* of memory per zone. More memory means that we can defer updates for
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* longer, more processors could lead to more contention.
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* fls() is used to have a cheap way of logarithmic scaling.
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*
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* Some sample thresholds:
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*
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* Threshold Processors (fls) Zonesize fls(mem+1)
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* ------------------------------------------------------------------
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* 8 1 1 0.9-1 GB 4
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* 16 2 2 0.9-1 GB 4
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* 20 2 2 1-2 GB 5
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* 24 2 2 2-4 GB 6
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* 28 2 2 4-8 GB 7
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* 32 2 2 8-16 GB 8
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* 4 2 2 <128M 1
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* 30 4 3 2-4 GB 5
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* 48 4 3 8-16 GB 8
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* 32 8 4 1-2 GB 4
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* 32 8 4 0.9-1GB 4
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* 10 16 5 <128M 1
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* 40 16 5 900M 4
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* 70 64 7 2-4 GB 5
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* 84 64 7 4-8 GB 6
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* 108 512 9 4-8 GB 6
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* 125 1024 10 8-16 GB 8
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* 125 1024 10 16-32 GB 9
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*/
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mem = zone->managed_pages >> (27 - PAGE_SHIFT);
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threshold = 2 * fls(num_online_cpus()) * (1 + fls(mem));
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/*
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* Maximum threshold is 125
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*/
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threshold = min(125, threshold);
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return threshold;
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}
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/*
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* Refresh the thresholds for each zone.
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*/
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void refresh_zone_stat_thresholds(void)
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{
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struct zone *zone;
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int cpu;
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int threshold;
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for_each_populated_zone(zone) {
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unsigned long max_drift, tolerate_drift;
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threshold = calculate_normal_threshold(zone);
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for_each_online_cpu(cpu)
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per_cpu_ptr(zone->pageset, cpu)->stat_threshold
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= threshold;
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/*
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* Only set percpu_drift_mark if there is a danger that
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* NR_FREE_PAGES reports the low watermark is ok when in fact
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* the min watermark could be breached by an allocation
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*/
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tolerate_drift = low_wmark_pages(zone) - min_wmark_pages(zone);
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max_drift = num_online_cpus() * threshold;
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if (max_drift > tolerate_drift)
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zone->percpu_drift_mark = high_wmark_pages(zone) +
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max_drift;
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}
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}
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void set_pgdat_percpu_threshold(pg_data_t *pgdat,
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int (*calculate_pressure)(struct zone *))
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{
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struct zone *zone;
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int cpu;
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int threshold;
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int i;
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for (i = 0; i < pgdat->nr_zones; i++) {
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zone = &pgdat->node_zones[i];
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if (!zone->percpu_drift_mark)
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continue;
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threshold = (*calculate_pressure)(zone);
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for_each_possible_cpu(cpu)
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per_cpu_ptr(zone->pageset, cpu)->stat_threshold
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= threshold;
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}
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}
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/*
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* For use when we know that interrupts are disabled.
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*/
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void __mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
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int delta)
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{
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struct per_cpu_pageset __percpu *pcp = zone->pageset;
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s8 __percpu *p = pcp->vm_stat_diff + item;
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long x;
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long t;
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x = delta + __this_cpu_read(*p);
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t = __this_cpu_read(pcp->stat_threshold);
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if (unlikely(x > t || x < -t)) {
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zone_page_state_add(x, zone, item);
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x = 0;
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}
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__this_cpu_write(*p, x);
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}
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EXPORT_SYMBOL(__mod_zone_page_state);
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/*
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* Optimized increment and decrement functions.
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*
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* These are only for a single page and therefore can take a struct page *
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* argument instead of struct zone *. This allows the inclusion of the code
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* generated for page_zone(page) into the optimized functions.
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*
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* No overflow check is necessary and therefore the differential can be
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* incremented or decremented in place which may allow the compilers to
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* generate better code.
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* The increment or decrement is known and therefore one boundary check can
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* be omitted.
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*
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* NOTE: These functions are very performance sensitive. Change only
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* with care.
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*
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* Some processors have inc/dec instructions that are atomic vs an interrupt.
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* However, the code must first determine the differential location in a zone
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* based on the processor number and then inc/dec the counter. There is no
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* guarantee without disabling preemption that the processor will not change
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* in between and therefore the atomicity vs. interrupt cannot be exploited
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* in a useful way here.
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*/
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void __inc_zone_state(struct zone *zone, enum zone_stat_item item)
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{
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struct per_cpu_pageset __percpu *pcp = zone->pageset;
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s8 __percpu *p = pcp->vm_stat_diff + item;
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s8 v, t;
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v = __this_cpu_inc_return(*p);
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t = __this_cpu_read(pcp->stat_threshold);
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if (unlikely(v > t)) {
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s8 overstep = t >> 1;
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zone_page_state_add(v + overstep, zone, item);
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__this_cpu_write(*p, -overstep);
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}
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}
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void __inc_zone_page_state(struct page *page, enum zone_stat_item item)
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{
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__inc_zone_state(page_zone(page), item);
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}
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EXPORT_SYMBOL(__inc_zone_page_state);
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void __dec_zone_state(struct zone *zone, enum zone_stat_item item)
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{
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struct per_cpu_pageset __percpu *pcp = zone->pageset;
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s8 __percpu *p = pcp->vm_stat_diff + item;
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s8 v, t;
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v = __this_cpu_dec_return(*p);
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t = __this_cpu_read(pcp->stat_threshold);
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if (unlikely(v < - t)) {
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s8 overstep = t >> 1;
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zone_page_state_add(v - overstep, zone, item);
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__this_cpu_write(*p, overstep);
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}
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}
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void __dec_zone_page_state(struct page *page, enum zone_stat_item item)
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{
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__dec_zone_state(page_zone(page), item);
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}
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EXPORT_SYMBOL(__dec_zone_page_state);
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#ifdef CONFIG_HAVE_CMPXCHG_LOCAL
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/*
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* If we have cmpxchg_local support then we do not need to incur the overhead
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* that comes with local_irq_save/restore if we use this_cpu_cmpxchg.
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*
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* mod_state() modifies the zone counter state through atomic per cpu
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* operations.
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*
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* Overstep mode specifies how overstep should handled:
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* 0 No overstepping
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* 1 Overstepping half of threshold
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* -1 Overstepping minus half of threshold
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*/
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static inline void mod_state(struct zone *zone,
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enum zone_stat_item item, int delta, int overstep_mode)
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{
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struct per_cpu_pageset __percpu *pcp = zone->pageset;
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s8 __percpu *p = pcp->vm_stat_diff + item;
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long o, n, t, z;
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do {
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z = 0; /* overflow to zone counters */
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/*
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* The fetching of the stat_threshold is racy. We may apply
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* a counter threshold to the wrong the cpu if we get
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* rescheduled while executing here. However, the next
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* counter update will apply the threshold again and
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* therefore bring the counter under the threshold again.
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*
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* Most of the time the thresholds are the same anyways
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* for all cpus in a zone.
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*/
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t = this_cpu_read(pcp->stat_threshold);
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o = this_cpu_read(*p);
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n = delta + o;
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if (n > t || n < -t) {
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int os = overstep_mode * (t >> 1) ;
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/* Overflow must be added to zone counters */
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z = n + os;
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n = -os;
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}
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} while (this_cpu_cmpxchg(*p, o, n) != o);
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if (z)
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zone_page_state_add(z, zone, item);
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}
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void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
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int delta)
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{
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mod_state(zone, item, delta, 0);
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}
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EXPORT_SYMBOL(mod_zone_page_state);
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void inc_zone_state(struct zone *zone, enum zone_stat_item item)
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{
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mod_state(zone, item, 1, 1);
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}
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void inc_zone_page_state(struct page *page, enum zone_stat_item item)
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{
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mod_state(page_zone(page), item, 1, 1);
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}
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EXPORT_SYMBOL(inc_zone_page_state);
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void dec_zone_page_state(struct page *page, enum zone_stat_item item)
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{
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mod_state(page_zone(page), item, -1, -1);
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}
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EXPORT_SYMBOL(dec_zone_page_state);
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#else
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/*
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* Use interrupt disable to serialize counter updates
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*/
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void mod_zone_page_state(struct zone *zone, enum zone_stat_item item,
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int delta)
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{
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unsigned long flags;
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local_irq_save(flags);
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__mod_zone_page_state(zone, item, delta);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(mod_zone_page_state);
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void inc_zone_state(struct zone *zone, enum zone_stat_item item)
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{
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unsigned long flags;
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local_irq_save(flags);
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__inc_zone_state(zone, item);
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local_irq_restore(flags);
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}
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void inc_zone_page_state(struct page *page, enum zone_stat_item item)
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{
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unsigned long flags;
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struct zone *zone;
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zone = page_zone(page);
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local_irq_save(flags);
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__inc_zone_state(zone, item);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(inc_zone_page_state);
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void dec_zone_page_state(struct page *page, enum zone_stat_item item)
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{
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unsigned long flags;
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local_irq_save(flags);
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__dec_zone_page_state(page, item);
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(dec_zone_page_state);
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#endif
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static inline void fold_diff(int *diff)
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{
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int i;
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
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if (diff[i])
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atomic_long_add(diff[i], &vm_stat[i]);
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}
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|
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/*
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* Update the zone counters for the current cpu.
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*
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* Note that refresh_cpu_vm_stats strives to only access
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* node local memory. The per cpu pagesets on remote zones are placed
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* in the memory local to the processor using that pageset. So the
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* loop over all zones will access a series of cachelines local to
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* the processor.
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*
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* The call to zone_page_state_add updates the cachelines with the
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* statistics in the remote zone struct as well as the global cachelines
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* with the global counters. These could cause remote node cache line
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* bouncing and will have to be only done when necessary.
|
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*/
|
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static void refresh_cpu_vm_stats(int cpu)
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{
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struct zone *zone;
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int i;
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int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
|
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|
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for_each_populated_zone(zone) {
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struct per_cpu_pageset *p;
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|
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p = per_cpu_ptr(zone->pageset, cpu);
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|
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
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if (p->vm_stat_diff[i]) {
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unsigned long flags;
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int v;
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|
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local_irq_save(flags);
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v = p->vm_stat_diff[i];
|
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p->vm_stat_diff[i] = 0;
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local_irq_restore(flags);
|
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atomic_long_add(v, &zone->vm_stat[i]);
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global_diff[i] += v;
|
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#ifdef CONFIG_NUMA
|
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/* 3 seconds idle till flush */
|
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p->expire = 3;
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#endif
|
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}
|
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cond_resched();
|
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#ifdef CONFIG_NUMA
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/*
|
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* Deal with draining the remote pageset of this
|
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* processor
|
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*
|
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* Check if there are pages remaining in this pageset
|
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* if not then there is nothing to expire.
|
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*/
|
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if (!p->expire || !p->pcp.count)
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continue;
|
|
|
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/*
|
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* We never drain zones local to this processor.
|
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*/
|
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if (zone_to_nid(zone) == numa_node_id()) {
|
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p->expire = 0;
|
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continue;
|
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}
|
|
|
|
p->expire--;
|
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if (p->expire)
|
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continue;
|
|
|
|
if (p->pcp.count)
|
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drain_zone_pages(zone, &p->pcp);
|
|
#endif
|
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}
|
|
fold_diff(global_diff);
|
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}
|
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|
|
/*
|
|
* Fold the data for an offline cpu into the global array.
|
|
* There cannot be any access by the offline cpu and therefore
|
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* synchronization is simplified.
|
|
*/
|
|
void cpu_vm_stats_fold(int cpu)
|
|
{
|
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struct zone *zone;
|
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int i;
|
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int global_diff[NR_VM_ZONE_STAT_ITEMS] = { 0, };
|
|
|
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for_each_populated_zone(zone) {
|
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struct per_cpu_pageset *p;
|
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|
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p = per_cpu_ptr(zone->pageset, cpu);
|
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|
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
|
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if (p->vm_stat_diff[i]) {
|
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int v;
|
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|
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v = p->vm_stat_diff[i];
|
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p->vm_stat_diff[i] = 0;
|
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atomic_long_add(v, &zone->vm_stat[i]);
|
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global_diff[i] += v;
|
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}
|
|
}
|
|
|
|
fold_diff(global_diff);
|
|
}
|
|
|
|
/*
|
|
* this is only called if !populated_zone(zone), which implies no other users of
|
|
* pset->vm_stat_diff[] exsist.
|
|
*/
|
|
void drain_zonestat(struct zone *zone, struct per_cpu_pageset *pset)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
|
|
if (pset->vm_stat_diff[i]) {
|
|
int v = pset->vm_stat_diff[i];
|
|
pset->vm_stat_diff[i] = 0;
|
|
atomic_long_add(v, &zone->vm_stat[i]);
|
|
atomic_long_add(v, &vm_stat[i]);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_NUMA
|
|
/*
|
|
* zonelist = the list of zones passed to the allocator
|
|
* z = the zone from which the allocation occurred.
|
|
*
|
|
* Must be called with interrupts disabled.
|
|
*
|
|
* When __GFP_OTHER_NODE is set assume the node of the preferred
|
|
* zone is the local node. This is useful for daemons who allocate
|
|
* memory on behalf of other processes.
|
|
*/
|
|
void zone_statistics(struct zone *preferred_zone, struct zone *z, gfp_t flags)
|
|
{
|
|
if (z->zone_pgdat == preferred_zone->zone_pgdat) {
|
|
__inc_zone_state(z, NUMA_HIT);
|
|
} else {
|
|
__inc_zone_state(z, NUMA_MISS);
|
|
__inc_zone_state(preferred_zone, NUMA_FOREIGN);
|
|
}
|
|
if (z->node == ((flags & __GFP_OTHER_NODE) ?
|
|
preferred_zone->node : numa_node_id()))
|
|
__inc_zone_state(z, NUMA_LOCAL);
|
|
else
|
|
__inc_zone_state(z, NUMA_OTHER);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_COMPACTION
|
|
|
|
struct contig_page_info {
|
|
unsigned long free_pages;
|
|
unsigned long free_blocks_total;
|
|
unsigned long free_blocks_suitable;
|
|
};
|
|
|
|
/*
|
|
* Calculate the number of free pages in a zone, how many contiguous
|
|
* pages are free and how many are large enough to satisfy an allocation of
|
|
* the target size. Note that this function makes no attempt to estimate
|
|
* how many suitable free blocks there *might* be if MOVABLE pages were
|
|
* migrated. Calculating that is possible, but expensive and can be
|
|
* figured out from userspace
|
|
*/
|
|
static void fill_contig_page_info(struct zone *zone,
|
|
unsigned int suitable_order,
|
|
struct contig_page_info *info)
|
|
{
|
|
unsigned int order;
|
|
|
|
info->free_pages = 0;
|
|
info->free_blocks_total = 0;
|
|
info->free_blocks_suitable = 0;
|
|
|
|
for (order = 0; order < MAX_ORDER; order++) {
|
|
unsigned long blocks;
|
|
|
|
/* Count number of free blocks */
|
|
blocks = zone->free_area[order].nr_free;
|
|
info->free_blocks_total += blocks;
|
|
|
|
/* Count free base pages */
|
|
info->free_pages += blocks << order;
|
|
|
|
/* Count the suitable free blocks */
|
|
if (order >= suitable_order)
|
|
info->free_blocks_suitable += blocks <<
|
|
(order - suitable_order);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* A fragmentation index only makes sense if an allocation of a requested
|
|
* size would fail. If that is true, the fragmentation index indicates
|
|
* whether external fragmentation or a lack of memory was the problem.
|
|
* The value can be used to determine if page reclaim or compaction
|
|
* should be used
|
|
*/
|
|
static int __fragmentation_index(unsigned int order, struct contig_page_info *info)
|
|
{
|
|
unsigned long requested = 1UL << order;
|
|
|
|
if (!info->free_blocks_total)
|
|
return 0;
|
|
|
|
/* Fragmentation index only makes sense when a request would fail */
|
|
if (info->free_blocks_suitable)
|
|
return -1000;
|
|
|
|
/*
|
|
* Index is between 0 and 1 so return within 3 decimal places
|
|
*
|
|
* 0 => allocation would fail due to lack of memory
|
|
* 1 => allocation would fail due to fragmentation
|
|
*/
|
|
return 1000 - div_u64( (1000+(div_u64(info->free_pages * 1000ULL, requested))), info->free_blocks_total);
|
|
}
|
|
|
|
/* Same as __fragmentation index but allocs contig_page_info on stack */
|
|
int fragmentation_index(struct zone *zone, unsigned int order)
|
|
{
|
|
struct contig_page_info info;
|
|
|
|
fill_contig_page_info(zone, order, &info);
|
|
return __fragmentation_index(order, &info);
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_PROC_FS) || defined(CONFIG_COMPACTION)
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/seq_file.h>
|
|
|
|
static char * const migratetype_names[MIGRATE_TYPES] = {
|
|
"Unmovable",
|
|
"Reclaimable",
|
|
"Movable",
|
|
"Reserve",
|
|
#ifdef CONFIG_CMA
|
|
"CMA",
|
|
#endif
|
|
#ifdef CONFIG_MEMORY_ISOLATION
|
|
"Isolate",
|
|
#endif
|
|
};
|
|
|
|
static void *frag_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
pg_data_t *pgdat;
|
|
loff_t node = *pos;
|
|
for (pgdat = first_online_pgdat();
|
|
pgdat && node;
|
|
pgdat = next_online_pgdat(pgdat))
|
|
--node;
|
|
|
|
return pgdat;
|
|
}
|
|
|
|
static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
|
|
{
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
|
|
(*pos)++;
|
|
return next_online_pgdat(pgdat);
|
|
}
|
|
|
|
static void frag_stop(struct seq_file *m, void *arg)
|
|
{
|
|
}
|
|
|
|
/* Walk all the zones in a node and print using a callback */
|
|
static void walk_zones_in_node(struct seq_file *m, pg_data_t *pgdat,
|
|
void (*print)(struct seq_file *m, pg_data_t *, struct zone *))
|
|
{
|
|
struct zone *zone;
|
|
struct zone *node_zones = pgdat->node_zones;
|
|
unsigned long flags;
|
|
|
|
for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
|
|
if (!populated_zone(zone))
|
|
continue;
|
|
|
|
spin_lock_irqsave(&zone->lock, flags);
|
|
print(m, pgdat, zone);
|
|
spin_unlock_irqrestore(&zone->lock, flags);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_PROC_FS) || defined(CONFIG_SYSFS) || defined(CONFIG_NUMA)
|
|
#ifdef CONFIG_ZONE_DMA
|
|
#define TEXT_FOR_DMA(xx) xx "_dma",
|
|
#else
|
|
#define TEXT_FOR_DMA(xx)
|
|
#endif
|
|
|
|
#ifdef CONFIG_ZONE_DMA32
|
|
#define TEXT_FOR_DMA32(xx) xx "_dma32",
|
|
#else
|
|
#define TEXT_FOR_DMA32(xx)
|
|
#endif
|
|
|
|
#ifdef CONFIG_HIGHMEM
|
|
#define TEXT_FOR_HIGHMEM(xx) xx "_high",
|
|
#else
|
|
#define TEXT_FOR_HIGHMEM(xx)
|
|
#endif
|
|
|
|
#define TEXTS_FOR_ZONES(xx) TEXT_FOR_DMA(xx) TEXT_FOR_DMA32(xx) xx "_normal", \
|
|
TEXT_FOR_HIGHMEM(xx) xx "_movable",
|
|
|
|
const char * const vmstat_text[] = {
|
|
/* Zoned VM counters */
|
|
"nr_free_pages",
|
|
"nr_alloc_batch",
|
|
"nr_inactive_anon",
|
|
"nr_active_anon",
|
|
"nr_inactive_file",
|
|
"nr_active_file",
|
|
"nr_unevictable",
|
|
"nr_mlock",
|
|
"nr_anon_pages",
|
|
"nr_mapped",
|
|
"nr_file_pages",
|
|
"nr_dirty",
|
|
"nr_writeback",
|
|
"nr_slab_reclaimable",
|
|
"nr_slab_unreclaimable",
|
|
"nr_page_table_pages",
|
|
"nr_kernel_stack",
|
|
"nr_unstable",
|
|
"nr_bounce",
|
|
"nr_vmscan_write",
|
|
"nr_vmscan_immediate_reclaim",
|
|
"nr_writeback_temp",
|
|
"nr_isolated_anon",
|
|
"nr_isolated_file",
|
|
"nr_shmem",
|
|
"nr_dirtied",
|
|
"nr_written",
|
|
|
|
#ifdef CONFIG_NUMA
|
|
"numa_hit",
|
|
"numa_miss",
|
|
"numa_foreign",
|
|
"numa_interleave",
|
|
"numa_local",
|
|
"numa_other",
|
|
#endif
|
|
"nr_anon_transparent_hugepages",
|
|
"nr_free_cma",
|
|
"nr_dirty_threshold",
|
|
"nr_dirty_background_threshold",
|
|
|
|
#ifdef CONFIG_VM_EVENT_COUNTERS
|
|
"pgpgin",
|
|
"pgpgout",
|
|
"pswpin",
|
|
"pswpout",
|
|
|
|
TEXTS_FOR_ZONES("pgalloc")
|
|
|
|
"pgfree",
|
|
"pgactivate",
|
|
"pgdeactivate",
|
|
|
|
"pgfault",
|
|
"pgmajfault",
|
|
|
|
TEXTS_FOR_ZONES("pgrefill")
|
|
TEXTS_FOR_ZONES("pgsteal_kswapd")
|
|
TEXTS_FOR_ZONES("pgsteal_direct")
|
|
TEXTS_FOR_ZONES("pgscan_kswapd")
|
|
TEXTS_FOR_ZONES("pgscan_direct")
|
|
"pgscan_direct_throttle",
|
|
|
|
#ifdef CONFIG_NUMA
|
|
"zone_reclaim_failed",
|
|
#endif
|
|
"pginodesteal",
|
|
"slabs_scanned",
|
|
"kswapd_inodesteal",
|
|
"kswapd_low_wmark_hit_quickly",
|
|
"kswapd_high_wmark_hit_quickly",
|
|
"pageoutrun",
|
|
"allocstall",
|
|
|
|
"pgrotated",
|
|
|
|
#ifdef CONFIG_NUMA_BALANCING
|
|
"numa_pte_updates",
|
|
"numa_hint_faults",
|
|
"numa_hint_faults_local",
|
|
"numa_pages_migrated",
|
|
#endif
|
|
#ifdef CONFIG_MIGRATION
|
|
"pgmigrate_success",
|
|
"pgmigrate_fail",
|
|
#endif
|
|
#ifdef CONFIG_COMPACTION
|
|
"compact_migrate_scanned",
|
|
"compact_free_scanned",
|
|
"compact_isolated",
|
|
"compact_stall",
|
|
"compact_fail",
|
|
"compact_success",
|
|
#endif
|
|
|
|
#ifdef CONFIG_HUGETLB_PAGE
|
|
"htlb_buddy_alloc_success",
|
|
"htlb_buddy_alloc_fail",
|
|
#endif
|
|
"unevictable_pgs_culled",
|
|
"unevictable_pgs_scanned",
|
|
"unevictable_pgs_rescued",
|
|
"unevictable_pgs_mlocked",
|
|
"unevictable_pgs_munlocked",
|
|
"unevictable_pgs_cleared",
|
|
"unevictable_pgs_stranded",
|
|
|
|
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
|
|
"thp_fault_alloc",
|
|
"thp_fault_fallback",
|
|
"thp_collapse_alloc",
|
|
"thp_collapse_alloc_failed",
|
|
"thp_split",
|
|
"thp_zero_page_alloc",
|
|
"thp_zero_page_alloc_failed",
|
|
#endif
|
|
#ifdef CONFIG_SMP
|
|
"nr_tlb_remote_flush",
|
|
"nr_tlb_remote_flush_received",
|
|
#endif
|
|
"nr_tlb_local_flush_all",
|
|
"nr_tlb_local_flush_one",
|
|
|
|
#endif /* CONFIG_VM_EVENTS_COUNTERS */
|
|
};
|
|
#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA */
|
|
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static void frag_show_print(struct seq_file *m, pg_data_t *pgdat,
|
|
struct zone *zone)
|
|
{
|
|
int order;
|
|
|
|
seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
|
|
for (order = 0; order < MAX_ORDER; ++order)
|
|
seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
/*
|
|
* This walks the free areas for each zone.
|
|
*/
|
|
static int frag_show(struct seq_file *m, void *arg)
|
|
{
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
walk_zones_in_node(m, pgdat, frag_show_print);
|
|
return 0;
|
|
}
|
|
|
|
static void pagetypeinfo_showfree_print(struct seq_file *m,
|
|
pg_data_t *pgdat, struct zone *zone)
|
|
{
|
|
int order, mtype;
|
|
|
|
for (mtype = 0; mtype < MIGRATE_TYPES; mtype++) {
|
|
seq_printf(m, "Node %4d, zone %8s, type %12s ",
|
|
pgdat->node_id,
|
|
zone->name,
|
|
migratetype_names[mtype]);
|
|
for (order = 0; order < MAX_ORDER; ++order) {
|
|
unsigned long freecount = 0;
|
|
struct free_area *area;
|
|
struct list_head *curr;
|
|
|
|
area = &(zone->free_area[order]);
|
|
|
|
list_for_each(curr, &area->free_list[mtype])
|
|
freecount++;
|
|
seq_printf(m, "%6lu ", freecount);
|
|
}
|
|
seq_putc(m, '\n');
|
|
}
|
|
}
|
|
|
|
/* Print out the free pages at each order for each migatetype */
|
|
static int pagetypeinfo_showfree(struct seq_file *m, void *arg)
|
|
{
|
|
int order;
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
|
|
/* Print header */
|
|
seq_printf(m, "%-43s ", "Free pages count per migrate type at order");
|
|
for (order = 0; order < MAX_ORDER; ++order)
|
|
seq_printf(m, "%6d ", order);
|
|
seq_putc(m, '\n');
|
|
|
|
walk_zones_in_node(m, pgdat, pagetypeinfo_showfree_print);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void pagetypeinfo_showblockcount_print(struct seq_file *m,
|
|
pg_data_t *pgdat, struct zone *zone)
|
|
{
|
|
int mtype;
|
|
unsigned long pfn;
|
|
unsigned long start_pfn = zone->zone_start_pfn;
|
|
unsigned long end_pfn = zone_end_pfn(zone);
|
|
unsigned long count[MIGRATE_TYPES] = { 0, };
|
|
|
|
for (pfn = start_pfn; pfn < end_pfn; pfn += pageblock_nr_pages) {
|
|
struct page *page;
|
|
|
|
if (!pfn_valid(pfn))
|
|
continue;
|
|
|
|
page = pfn_to_page(pfn);
|
|
|
|
/* Watch for unexpected holes punched in the memmap */
|
|
if (!memmap_valid_within(pfn, page, zone))
|
|
continue;
|
|
|
|
mtype = get_pageblock_migratetype(page);
|
|
|
|
if (mtype < MIGRATE_TYPES)
|
|
count[mtype]++;
|
|
}
|
|
|
|
/* Print counts */
|
|
seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
|
|
for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
|
|
seq_printf(m, "%12lu ", count[mtype]);
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
/* Print out the free pages at each order for each migratetype */
|
|
static int pagetypeinfo_showblockcount(struct seq_file *m, void *arg)
|
|
{
|
|
int mtype;
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
|
|
seq_printf(m, "\n%-23s", "Number of blocks type ");
|
|
for (mtype = 0; mtype < MIGRATE_TYPES; mtype++)
|
|
seq_printf(m, "%12s ", migratetype_names[mtype]);
|
|
seq_putc(m, '\n');
|
|
walk_zones_in_node(m, pgdat, pagetypeinfo_showblockcount_print);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This prints out statistics in relation to grouping pages by mobility.
|
|
* It is expensive to collect so do not constantly read the file.
|
|
*/
|
|
static int pagetypeinfo_show(struct seq_file *m, void *arg)
|
|
{
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
|
|
/* check memoryless node */
|
|
if (!node_state(pgdat->node_id, N_MEMORY))
|
|
return 0;
|
|
|
|
seq_printf(m, "Page block order: %d\n", pageblock_order);
|
|
seq_printf(m, "Pages per block: %lu\n", pageblock_nr_pages);
|
|
seq_putc(m, '\n');
|
|
pagetypeinfo_showfree(m, pgdat);
|
|
pagetypeinfo_showblockcount(m, pgdat);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations fragmentation_op = {
|
|
.start = frag_start,
|
|
.next = frag_next,
|
|
.stop = frag_stop,
|
|
.show = frag_show,
|
|
};
|
|
|
|
static int fragmentation_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &fragmentation_op);
|
|
}
|
|
|
|
static const struct file_operations fragmentation_file_operations = {
|
|
.open = fragmentation_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static const struct seq_operations pagetypeinfo_op = {
|
|
.start = frag_start,
|
|
.next = frag_next,
|
|
.stop = frag_stop,
|
|
.show = pagetypeinfo_show,
|
|
};
|
|
|
|
static int pagetypeinfo_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &pagetypeinfo_op);
|
|
}
|
|
|
|
static const struct file_operations pagetypeinfo_file_ops = {
|
|
.open = pagetypeinfo_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static void zoneinfo_show_print(struct seq_file *m, pg_data_t *pgdat,
|
|
struct zone *zone)
|
|
{
|
|
int i;
|
|
seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
|
|
seq_printf(m,
|
|
"\n pages free %lu"
|
|
"\n min %lu"
|
|
"\n low %lu"
|
|
"\n high %lu"
|
|
"\n scanned %lu"
|
|
"\n spanned %lu"
|
|
"\n present %lu"
|
|
"\n managed %lu",
|
|
zone_page_state(zone, NR_FREE_PAGES),
|
|
min_wmark_pages(zone),
|
|
low_wmark_pages(zone),
|
|
high_wmark_pages(zone),
|
|
zone->pages_scanned,
|
|
zone->spanned_pages,
|
|
zone->present_pages,
|
|
zone->managed_pages);
|
|
|
|
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
|
|
seq_printf(m, "\n %-12s %lu", vmstat_text[i],
|
|
zone_page_state(zone, i));
|
|
|
|
seq_printf(m,
|
|
"\n protection: (%lu",
|
|
zone->lowmem_reserve[0]);
|
|
for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
|
|
seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
|
|
seq_printf(m,
|
|
")"
|
|
"\n pagesets");
|
|
for_each_online_cpu(i) {
|
|
struct per_cpu_pageset *pageset;
|
|
|
|
pageset = per_cpu_ptr(zone->pageset, i);
|
|
seq_printf(m,
|
|
"\n cpu: %i"
|
|
"\n count: %i"
|
|
"\n high: %i"
|
|
"\n batch: %i",
|
|
i,
|
|
pageset->pcp.count,
|
|
pageset->pcp.high,
|
|
pageset->pcp.batch);
|
|
#ifdef CONFIG_SMP
|
|
seq_printf(m, "\n vm stats threshold: %d",
|
|
pageset->stat_threshold);
|
|
#endif
|
|
}
|
|
seq_printf(m,
|
|
"\n all_unreclaimable: %u"
|
|
"\n start_pfn: %lu"
|
|
"\n inactive_ratio: %u",
|
|
zone->all_unreclaimable,
|
|
zone->zone_start_pfn,
|
|
zone->inactive_ratio);
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
/*
|
|
* Output information about zones in @pgdat.
|
|
*/
|
|
static int zoneinfo_show(struct seq_file *m, void *arg)
|
|
{
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
walk_zones_in_node(m, pgdat, zoneinfo_show_print);
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations zoneinfo_op = {
|
|
.start = frag_start, /* iterate over all zones. The same as in
|
|
* fragmentation. */
|
|
.next = frag_next,
|
|
.stop = frag_stop,
|
|
.show = zoneinfo_show,
|
|
};
|
|
|
|
static int zoneinfo_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &zoneinfo_op);
|
|
}
|
|
|
|
static const struct file_operations proc_zoneinfo_file_operations = {
|
|
.open = zoneinfo_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
enum writeback_stat_item {
|
|
NR_DIRTY_THRESHOLD,
|
|
NR_DIRTY_BG_THRESHOLD,
|
|
NR_VM_WRITEBACK_STAT_ITEMS,
|
|
};
|
|
|
|
static void *vmstat_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
unsigned long *v;
|
|
int i, stat_items_size;
|
|
|
|
if (*pos >= ARRAY_SIZE(vmstat_text))
|
|
return NULL;
|
|
stat_items_size = NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long) +
|
|
NR_VM_WRITEBACK_STAT_ITEMS * sizeof(unsigned long);
|
|
|
|
#ifdef CONFIG_VM_EVENT_COUNTERS
|
|
stat_items_size += sizeof(struct vm_event_state);
|
|
#endif
|
|
|
|
v = kmalloc(stat_items_size, GFP_KERNEL);
|
|
m->private = v;
|
|
if (!v)
|
|
return ERR_PTR(-ENOMEM);
|
|
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
|
|
v[i] = global_page_state(i);
|
|
v += NR_VM_ZONE_STAT_ITEMS;
|
|
|
|
global_dirty_limits(v + NR_DIRTY_BG_THRESHOLD,
|
|
v + NR_DIRTY_THRESHOLD);
|
|
v += NR_VM_WRITEBACK_STAT_ITEMS;
|
|
|
|
#ifdef CONFIG_VM_EVENT_COUNTERS
|
|
all_vm_events(v);
|
|
v[PGPGIN] /= 2; /* sectors -> kbytes */
|
|
v[PGPGOUT] /= 2;
|
|
#endif
|
|
return (unsigned long *)m->private + *pos;
|
|
}
|
|
|
|
static void *vmstat_next(struct seq_file *m, void *arg, loff_t *pos)
|
|
{
|
|
(*pos)++;
|
|
if (*pos >= ARRAY_SIZE(vmstat_text))
|
|
return NULL;
|
|
return (unsigned long *)m->private + *pos;
|
|
}
|
|
|
|
static int vmstat_show(struct seq_file *m, void *arg)
|
|
{
|
|
unsigned long *l = arg;
|
|
unsigned long off = l - (unsigned long *)m->private;
|
|
|
|
seq_printf(m, "%s %lu\n", vmstat_text[off], *l);
|
|
return 0;
|
|
}
|
|
|
|
static void vmstat_stop(struct seq_file *m, void *arg)
|
|
{
|
|
kfree(m->private);
|
|
m->private = NULL;
|
|
}
|
|
|
|
static const struct seq_operations vmstat_op = {
|
|
.start = vmstat_start,
|
|
.next = vmstat_next,
|
|
.stop = vmstat_stop,
|
|
.show = vmstat_show,
|
|
};
|
|
|
|
static int vmstat_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &vmstat_op);
|
|
}
|
|
|
|
static const struct file_operations proc_vmstat_file_operations = {
|
|
.open = vmstat_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
#ifdef CONFIG_SMP
|
|
static DEFINE_PER_CPU(struct delayed_work, vmstat_work);
|
|
int sysctl_stat_interval __read_mostly = HZ;
|
|
|
|
static void vmstat_update(struct work_struct *w)
|
|
{
|
|
refresh_cpu_vm_stats(smp_processor_id());
|
|
schedule_delayed_work(&__get_cpu_var(vmstat_work),
|
|
round_jiffies_relative(sysctl_stat_interval));
|
|
}
|
|
|
|
static void start_cpu_timer(int cpu)
|
|
{
|
|
struct delayed_work *work = &per_cpu(vmstat_work, cpu);
|
|
|
|
INIT_DEFERRABLE_WORK(work, vmstat_update);
|
|
schedule_delayed_work_on(cpu, work, __round_jiffies_relative(HZ, cpu));
|
|
}
|
|
|
|
/*
|
|
* Use the cpu notifier to insure that the thresholds are recalculated
|
|
* when necessary.
|
|
*/
|
|
static int vmstat_cpuup_callback(struct notifier_block *nfb,
|
|
unsigned long action,
|
|
void *hcpu)
|
|
{
|
|
long cpu = (long)hcpu;
|
|
|
|
switch (action) {
|
|
case CPU_ONLINE:
|
|
case CPU_ONLINE_FROZEN:
|
|
refresh_zone_stat_thresholds();
|
|
start_cpu_timer(cpu);
|
|
node_set_state(cpu_to_node(cpu), N_CPU);
|
|
break;
|
|
case CPU_DOWN_PREPARE:
|
|
case CPU_DOWN_PREPARE_FROZEN:
|
|
cancel_delayed_work_sync(&per_cpu(vmstat_work, cpu));
|
|
per_cpu(vmstat_work, cpu).work.func = NULL;
|
|
break;
|
|
case CPU_DOWN_FAILED:
|
|
case CPU_DOWN_FAILED_FROZEN:
|
|
start_cpu_timer(cpu);
|
|
break;
|
|
case CPU_DEAD:
|
|
case CPU_DEAD_FROZEN:
|
|
refresh_zone_stat_thresholds();
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block vmstat_notifier =
|
|
{ &vmstat_cpuup_callback, NULL, 0 };
|
|
#endif
|
|
|
|
static int __init setup_vmstat(void)
|
|
{
|
|
#ifdef CONFIG_SMP
|
|
int cpu;
|
|
|
|
register_cpu_notifier(&vmstat_notifier);
|
|
|
|
for_each_online_cpu(cpu)
|
|
start_cpu_timer(cpu);
|
|
#endif
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_create("buddyinfo", S_IRUGO, NULL, &fragmentation_file_operations);
|
|
proc_create("pagetypeinfo", S_IRUGO, NULL, &pagetypeinfo_file_ops);
|
|
proc_create("vmstat", S_IRUGO, NULL, &proc_vmstat_file_operations);
|
|
proc_create("zoneinfo", S_IRUGO, NULL, &proc_zoneinfo_file_operations);
|
|
#endif
|
|
return 0;
|
|
}
|
|
module_init(setup_vmstat)
|
|
|
|
#if defined(CONFIG_DEBUG_FS) && defined(CONFIG_COMPACTION)
|
|
#include <linux/debugfs.h>
|
|
|
|
|
|
/*
|
|
* Return an index indicating how much of the available free memory is
|
|
* unusable for an allocation of the requested size.
|
|
*/
|
|
static int unusable_free_index(unsigned int order,
|
|
struct contig_page_info *info)
|
|
{
|
|
/* No free memory is interpreted as all free memory is unusable */
|
|
if (info->free_pages == 0)
|
|
return 1000;
|
|
|
|
/*
|
|
* Index should be a value between 0 and 1. Return a value to 3
|
|
* decimal places.
|
|
*
|
|
* 0 => no fragmentation
|
|
* 1 => high fragmentation
|
|
*/
|
|
return div_u64((info->free_pages - (info->free_blocks_suitable << order)) * 1000ULL, info->free_pages);
|
|
|
|
}
|
|
|
|
static void unusable_show_print(struct seq_file *m,
|
|
pg_data_t *pgdat, struct zone *zone)
|
|
{
|
|
unsigned int order;
|
|
int index;
|
|
struct contig_page_info info;
|
|
|
|
seq_printf(m, "Node %d, zone %8s ",
|
|
pgdat->node_id,
|
|
zone->name);
|
|
for (order = 0; order < MAX_ORDER; ++order) {
|
|
fill_contig_page_info(zone, order, &info);
|
|
index = unusable_free_index(order, &info);
|
|
seq_printf(m, "%d.%03d ", index / 1000, index % 1000);
|
|
}
|
|
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
/*
|
|
* Display unusable free space index
|
|
*
|
|
* The unusable free space index measures how much of the available free
|
|
* memory cannot be used to satisfy an allocation of a given size and is a
|
|
* value between 0 and 1. The higher the value, the more of free memory is
|
|
* unusable and by implication, the worse the external fragmentation is. This
|
|
* can be expressed as a percentage by multiplying by 100.
|
|
*/
|
|
static int unusable_show(struct seq_file *m, void *arg)
|
|
{
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
|
|
/* check memoryless node */
|
|
if (!node_state(pgdat->node_id, N_MEMORY))
|
|
return 0;
|
|
|
|
walk_zones_in_node(m, pgdat, unusable_show_print);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations unusable_op = {
|
|
.start = frag_start,
|
|
.next = frag_next,
|
|
.stop = frag_stop,
|
|
.show = unusable_show,
|
|
};
|
|
|
|
static int unusable_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &unusable_op);
|
|
}
|
|
|
|
static const struct file_operations unusable_file_ops = {
|
|
.open = unusable_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static void extfrag_show_print(struct seq_file *m,
|
|
pg_data_t *pgdat, struct zone *zone)
|
|
{
|
|
unsigned int order;
|
|
int index;
|
|
|
|
/* Alloc on stack as interrupts are disabled for zone walk */
|
|
struct contig_page_info info;
|
|
|
|
seq_printf(m, "Node %d, zone %8s ",
|
|
pgdat->node_id,
|
|
zone->name);
|
|
for (order = 0; order < MAX_ORDER; ++order) {
|
|
fill_contig_page_info(zone, order, &info);
|
|
index = __fragmentation_index(order, &info);
|
|
seq_printf(m, "%d.%03d ", index / 1000, index % 1000);
|
|
}
|
|
|
|
seq_putc(m, '\n');
|
|
}
|
|
|
|
/*
|
|
* Display fragmentation index for orders that allocations would fail for
|
|
*/
|
|
static int extfrag_show(struct seq_file *m, void *arg)
|
|
{
|
|
pg_data_t *pgdat = (pg_data_t *)arg;
|
|
|
|
walk_zones_in_node(m, pgdat, extfrag_show_print);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct seq_operations extfrag_op = {
|
|
.start = frag_start,
|
|
.next = frag_next,
|
|
.stop = frag_stop,
|
|
.show = extfrag_show,
|
|
};
|
|
|
|
static int extfrag_open(struct inode *inode, struct file *file)
|
|
{
|
|
return seq_open(file, &extfrag_op);
|
|
}
|
|
|
|
static const struct file_operations extfrag_file_ops = {
|
|
.open = extfrag_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release,
|
|
};
|
|
|
|
static int __init extfrag_debug_init(void)
|
|
{
|
|
struct dentry *extfrag_debug_root;
|
|
|
|
extfrag_debug_root = debugfs_create_dir("extfrag", NULL);
|
|
if (!extfrag_debug_root)
|
|
return -ENOMEM;
|
|
|
|
if (!debugfs_create_file("unusable_index", 0444,
|
|
extfrag_debug_root, NULL, &unusable_file_ops))
|
|
goto fail;
|
|
|
|
if (!debugfs_create_file("extfrag_index", 0444,
|
|
extfrag_debug_root, NULL, &extfrag_file_ops))
|
|
goto fail;
|
|
|
|
return 0;
|
|
fail:
|
|
debugfs_remove_recursive(extfrag_debug_root);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
module_init(extfrag_debug_init);
|
|
#endif
|