Per zone counter infrastructure The counters that we currently have for the VM are split per processor. The processor however has not much to do with the zone these pages belong to. We cannot tell f.e. how many ZONE_DMA pages are dirty. So we are blind to potentially inbalances in the usage of memory in various zones. F.e. in a NUMA system we cannot tell how many pages are dirty on a particular node. If we knew then we could put measures into the VM to balance the use of memory between different zones and different nodes in a NUMA system. For example it would be possible to limit the dirty pages per node so that fast local memory is kept available even if a process is dirtying huge amounts of pages. Another example is zone reclaim. We do not know how many unmapped pages exist per zone. So we just have to try to reclaim. If it is not working then we pause and try again later. It would be better if we knew when it makes sense to reclaim unmapped pages from a zone. This patchset allows the determination of the number of unmapped pages per zone. We can remove the zone reclaim interval with the counters introduced here. Futhermore the ability to have various usage statistics available will allow the development of new NUMA balancing algorithms that may be able to improve the decision making in the scheduler of when to move a process to another node and hopefully will also enable automatic page migration through a user space program that can analyse the memory load distribution and then rebalance memory use in order to increase performance. The counter framework here implements differential counters for each processor in struct zone. The differential counters are consolidated when a threshold is exceeded (like done in the current implementation for nr_pageache), when slab reaping occurs or when a consolidation function is called. Consolidation uses atomic operations and accumulates counters per zone in the zone structure and also globally in the vm_stat array. VM functions can access the counts by simply indexing a global or zone specific array. The arrangement of counters in an array also simplifies processing when output has to be generated for /proc/*. Counters can be updated by calling inc/dec_zone_page_state or _inc/dec_zone_page_state analogous to *_page_state. The second group of functions can be called if it is known that interrupts are disabled. Special optimized increment and decrement functions are provided. These can avoid certain checks and use increment or decrement instructions that an architecture may provide. We also add a new CONFIG_DMA_IS_NORMAL that signifies that an architecture can do DMA to all memory and therefore ZONE_NORMAL will not be populated. This is only currently set for IA64 SGI SN2 and currently only affects node_page_state(). In the best case node_page_state can be reduced to retrieving a single counter for the one zone on the node. [akpm@osdl.org: cleanups] [akpm@osdl.org: export vm_stat[] for filesystems] Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
628 lines
14 KiB
C
628 lines
14 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/config.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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/*
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* Accumulate the page_state information 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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DEFINE_PER_CPU(struct page_state, page_states) = {0};
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atomic_t nr_pagecache = ATOMIC_INIT(0);
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EXPORT_SYMBOL(nr_pagecache);
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#ifdef CONFIG_SMP
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DEFINE_PER_CPU(long, nr_pagecache_local) = 0;
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#endif
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static void __get_page_state(struct page_state *ret, int nr, cpumask_t *cpumask)
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{
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unsigned cpu;
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memset(ret, 0, nr * sizeof(unsigned long));
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cpus_and(*cpumask, *cpumask, cpu_online_map);
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for_each_cpu_mask(cpu, *cpumask) {
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unsigned long *in;
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unsigned long *out;
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unsigned off;
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unsigned next_cpu;
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in = (unsigned long *)&per_cpu(page_states, cpu);
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next_cpu = next_cpu(cpu, *cpumask);
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if (likely(next_cpu < NR_CPUS))
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prefetch(&per_cpu(page_states, next_cpu));
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out = (unsigned long *)ret;
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for (off = 0; off < nr; off++)
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*out++ += *in++;
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}
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}
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void get_page_state_node(struct page_state *ret, int node)
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{
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int nr;
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cpumask_t mask = node_to_cpumask(node);
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nr = offsetof(struct page_state, GET_PAGE_STATE_LAST);
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nr /= sizeof(unsigned long);
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__get_page_state(ret, nr+1, &mask);
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}
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void get_page_state(struct page_state *ret)
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{
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int nr;
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cpumask_t mask = CPU_MASK_ALL;
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nr = offsetof(struct page_state, GET_PAGE_STATE_LAST);
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nr /= sizeof(unsigned long);
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__get_page_state(ret, nr + 1, &mask);
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}
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void get_full_page_state(struct page_state *ret)
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{
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cpumask_t mask = CPU_MASK_ALL;
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__get_page_state(ret, sizeof(*ret) / sizeof(unsigned long), &mask);
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}
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unsigned long read_page_state_offset(unsigned long offset)
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{
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unsigned long ret = 0;
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int cpu;
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for_each_online_cpu(cpu) {
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unsigned long in;
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in = (unsigned long)&per_cpu(page_states, cpu) + offset;
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ret += *((unsigned long *)in);
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}
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return ret;
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}
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void __mod_page_state_offset(unsigned long offset, unsigned long delta)
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{
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void *ptr;
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ptr = &__get_cpu_var(page_states);
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*(unsigned long *)(ptr + offset) += delta;
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}
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EXPORT_SYMBOL(__mod_page_state_offset);
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void mod_page_state_offset(unsigned long offset, unsigned long delta)
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{
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unsigned long flags;
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void *ptr;
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local_irq_save(flags);
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ptr = &__get_cpu_var(page_states);
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*(unsigned long *)(ptr + offset) += delta;
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local_irq_restore(flags);
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}
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EXPORT_SYMBOL(mod_page_state_offset);
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void __get_zone_counts(unsigned long *active, unsigned long *inactive,
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unsigned long *free, struct pglist_data *pgdat)
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{
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struct zone *zones = pgdat->node_zones;
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int i;
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*active = 0;
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*inactive = 0;
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*free = 0;
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for (i = 0; i < MAX_NR_ZONES; i++) {
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*active += zones[i].nr_active;
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*inactive += zones[i].nr_inactive;
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*free += zones[i].free_pages;
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}
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}
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void get_zone_counts(unsigned long *active,
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unsigned long *inactive, unsigned long *free)
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{
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struct pglist_data *pgdat;
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*active = 0;
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*inactive = 0;
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*free = 0;
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for_each_online_pgdat(pgdat) {
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unsigned long l, m, n;
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__get_zone_counts(&l, &m, &n, pgdat);
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*active += l;
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*inactive += m;
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*free += n;
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}
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}
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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];
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EXPORT_SYMBOL(vm_stat);
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#ifdef CONFIG_SMP
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#define STAT_THRESHOLD 32
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/*
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* Determine pointer to currently valid differential byte given a zone and
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* the item number.
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*
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* Preemption must be off
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*/
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static inline s8 *diff_pointer(struct zone *zone, enum zone_stat_item item)
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{
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return &zone_pcp(zone, smp_processor_id())->vm_stat_diff[item];
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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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s8 *p;
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long x;
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p = diff_pointer(zone, item);
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x = delta + *p;
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if (unlikely(x > STAT_THRESHOLD || x < -STAT_THRESHOLD)) {
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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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*p = x;
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}
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EXPORT_SYMBOL(__mod_zone_page_state);
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/*
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* For an unknown interrupt state
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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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/*
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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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*
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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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* 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_page_state(struct page *page, enum zone_stat_item item)
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{
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struct zone *zone = page_zone(page);
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s8 *p = diff_pointer(zone, item);
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(*p)++;
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if (unlikely(*p > STAT_THRESHOLD)) {
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zone_page_state_add(*p, zone, item);
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*p = 0;
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}
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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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struct zone *zone = page_zone(page);
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s8 *p = diff_pointer(zone, item);
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(*p)--;
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if (unlikely(*p < -STAT_THRESHOLD)) {
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zone_page_state_add(*p, zone, item);
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*p = 0;
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}
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}
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EXPORT_SYMBOL(__dec_zone_page_state);
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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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s8 *p;
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zone = page_zone(page);
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local_irq_save(flags);
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p = diff_pointer(zone, item);
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(*p)++;
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if (unlikely(*p > STAT_THRESHOLD)) {
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zone_page_state_add(*p, zone, item);
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*p = 0;
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}
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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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struct zone *zone;
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s8 *p;
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zone = page_zone(page);
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local_irq_save(flags);
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p = diff_pointer(zone, item);
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(*p)--;
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if (unlikely(*p < -STAT_THRESHOLD)) {
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zone_page_state_add(*p, zone, item);
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*p = 0;
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}
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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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/*
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* Update the zone counters for one cpu.
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*/
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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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unsigned long flags;
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for_each_zone(zone) {
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struct per_cpu_pageset *pcp;
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pcp = zone_pcp(zone, cpu);
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
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if (pcp->vm_stat_diff[i]) {
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local_irq_save(flags);
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zone_page_state_add(pcp->vm_stat_diff[i],
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zone, i);
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pcp->vm_stat_diff[i] = 0;
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local_irq_restore(flags);
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}
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}
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}
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static void __refresh_cpu_vm_stats(void *dummy)
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{
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refresh_cpu_vm_stats(smp_processor_id());
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}
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/*
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* Consolidate all counters.
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*
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* Note that the result is less inaccurate but still inaccurate
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* if concurrent processes are allowed to run.
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*/
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void refresh_vm_stats(void)
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{
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on_each_cpu(__refresh_cpu_vm_stats, NULL, 0, 1);
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}
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EXPORT_SYMBOL(refresh_vm_stats);
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#endif
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#ifdef CONFIG_PROC_FS
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#include <linux/seq_file.h>
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static void *frag_start(struct seq_file *m, loff_t *pos)
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{
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pg_data_t *pgdat;
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loff_t node = *pos;
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for (pgdat = first_online_pgdat();
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pgdat && node;
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pgdat = next_online_pgdat(pgdat))
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--node;
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return pgdat;
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}
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static void *frag_next(struct seq_file *m, void *arg, loff_t *pos)
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{
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pg_data_t *pgdat = (pg_data_t *)arg;
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(*pos)++;
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return next_online_pgdat(pgdat);
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}
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static void frag_stop(struct seq_file *m, void *arg)
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{
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}
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/*
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* This walks the free areas for each zone.
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*/
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static int frag_show(struct seq_file *m, void *arg)
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{
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pg_data_t *pgdat = (pg_data_t *)arg;
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struct zone *zone;
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struct zone *node_zones = pgdat->node_zones;
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unsigned long flags;
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int order;
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for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; ++zone) {
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if (!populated_zone(zone))
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continue;
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spin_lock_irqsave(&zone->lock, flags);
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seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
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for (order = 0; order < MAX_ORDER; ++order)
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seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
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spin_unlock_irqrestore(&zone->lock, flags);
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seq_putc(m, '\n');
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}
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return 0;
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}
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struct seq_operations fragmentation_op = {
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.start = frag_start,
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.next = frag_next,
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.stop = frag_stop,
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.show = frag_show,
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};
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static char *vmstat_text[] = {
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/* Zoned VM counters */
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/* Page state */
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"nr_dirty",
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"nr_writeback",
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"nr_unstable",
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"nr_page_table_pages",
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"nr_mapped",
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"nr_slab",
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"pgpgin",
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"pgpgout",
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"pswpin",
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"pswpout",
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"pgalloc_high",
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"pgalloc_normal",
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"pgalloc_dma32",
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"pgalloc_dma",
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"pgfree",
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"pgactivate",
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"pgdeactivate",
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"pgfault",
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"pgmajfault",
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"pgrefill_high",
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"pgrefill_normal",
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"pgrefill_dma32",
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"pgrefill_dma",
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"pgsteal_high",
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"pgsteal_normal",
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"pgsteal_dma32",
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"pgsteal_dma",
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"pgscan_kswapd_high",
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"pgscan_kswapd_normal",
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"pgscan_kswapd_dma32",
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"pgscan_kswapd_dma",
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"pgscan_direct_high",
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"pgscan_direct_normal",
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"pgscan_direct_dma32",
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"pgscan_direct_dma",
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"pginodesteal",
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"slabs_scanned",
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"kswapd_steal",
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"kswapd_inodesteal",
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"pageoutrun",
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"allocstall",
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"pgrotated",
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"nr_bounce",
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};
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/*
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* Output information about zones in @pgdat.
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*/
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static int zoneinfo_show(struct seq_file *m, void *arg)
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{
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pg_data_t *pgdat = arg;
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struct zone *zone;
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struct zone *node_zones = pgdat->node_zones;
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unsigned long flags;
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for (zone = node_zones; zone - node_zones < MAX_NR_ZONES; zone++) {
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int i;
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if (!populated_zone(zone))
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continue;
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spin_lock_irqsave(&zone->lock, flags);
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seq_printf(m, "Node %d, zone %8s", pgdat->node_id, zone->name);
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seq_printf(m,
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"\n pages free %lu"
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"\n min %lu"
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"\n low %lu"
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"\n high %lu"
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"\n active %lu"
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"\n inactive %lu"
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"\n scanned %lu (a: %lu i: %lu)"
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"\n spanned %lu"
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"\n present %lu",
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zone->free_pages,
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zone->pages_min,
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zone->pages_low,
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zone->pages_high,
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zone->nr_active,
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zone->nr_inactive,
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zone->pages_scanned,
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zone->nr_scan_active, zone->nr_scan_inactive,
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zone->spanned_pages,
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zone->present_pages);
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for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
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seq_printf(m, "\n %-12s %lu", vmstat_text[i],
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zone_page_state(zone, i));
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seq_printf(m,
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"\n protection: (%lu",
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zone->lowmem_reserve[0]);
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for (i = 1; i < ARRAY_SIZE(zone->lowmem_reserve); i++)
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seq_printf(m, ", %lu", zone->lowmem_reserve[i]);
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seq_printf(m,
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")"
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"\n pagesets");
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for_each_online_cpu(i) {
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struct per_cpu_pageset *pageset;
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int j;
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|
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pageset = zone_pcp(zone, i);
|
|
for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
|
|
if (pageset->pcp[j].count)
|
|
break;
|
|
}
|
|
if (j == ARRAY_SIZE(pageset->pcp))
|
|
continue;
|
|
for (j = 0; j < ARRAY_SIZE(pageset->pcp); j++) {
|
|
seq_printf(m,
|
|
"\n cpu: %i pcp: %i"
|
|
"\n count: %i"
|
|
"\n high: %i"
|
|
"\n batch: %i",
|
|
i, j,
|
|
pageset->pcp[j].count,
|
|
pageset->pcp[j].high,
|
|
pageset->pcp[j].batch);
|
|
}
|
|
#ifdef CONFIG_NUMA
|
|
seq_printf(m,
|
|
"\n numa_hit: %lu"
|
|
"\n numa_miss: %lu"
|
|
"\n numa_foreign: %lu"
|
|
"\n interleave_hit: %lu"
|
|
"\n local_node: %lu"
|
|
"\n other_node: %lu",
|
|
pageset->numa_hit,
|
|
pageset->numa_miss,
|
|
pageset->numa_foreign,
|
|
pageset->interleave_hit,
|
|
pageset->local_node,
|
|
pageset->other_node);
|
|
#endif
|
|
}
|
|
seq_printf(m,
|
|
"\n all_unreclaimable: %u"
|
|
"\n prev_priority: %i"
|
|
"\n temp_priority: %i"
|
|
"\n start_pfn: %lu",
|
|
zone->all_unreclaimable,
|
|
zone->prev_priority,
|
|
zone->temp_priority,
|
|
zone->zone_start_pfn);
|
|
spin_unlock_irqrestore(&zone->lock, flags);
|
|
seq_putc(m, '\n');
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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 void *vmstat_start(struct seq_file *m, loff_t *pos)
|
|
{
|
|
unsigned long *v;
|
|
struct page_state *ps;
|
|
int i;
|
|
|
|
if (*pos >= ARRAY_SIZE(vmstat_text))
|
|
return NULL;
|
|
|
|
v = kmalloc(NR_VM_ZONE_STAT_ITEMS * sizeof(unsigned long)
|
|
+ sizeof(*ps), 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);
|
|
ps = (struct page_state *)(v + NR_VM_ZONE_STAT_ITEMS);
|
|
get_full_page_state(ps);
|
|
ps->pgpgin /= 2; /* sectors -> kbytes */
|
|
ps->pgpgout /= 2;
|
|
return v + *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;
|
|
}
|
|
|
|
struct seq_operations vmstat_op = {
|
|
.start = vmstat_start,
|
|
.next = vmstat_next,
|
|
.stop = vmstat_stop,
|
|
.show = vmstat_show,
|
|
};
|
|
|
|
#endif /* CONFIG_PROC_FS */
|
|
|