mm/lru: replace pgdat lru_lock with lruvec lock

This patch moves per node lru_lock into lruvec, thus bring a lru_lock for
each of memcg per node.  So on a large machine, each of memcg don't have
to suffer from per node pgdat->lru_lock competition.  They could go fast
with their self lru_lock.

After move memcg charge before lru inserting, page isolation could
serialize page's memcg, then per memcg lruvec lock is stable and could
replace per node lru lock.

In isolate_migratepages_block(), compact_unlock_should_abort and
lock_page_lruvec_irqsave are open coded to work with compact_control.
Also add a debug func in locking which may give some clues if there are
sth out of hands.

Daniel Jordan's testing show 62% improvement on modified readtwice case on
his 2P * 10 core * 2 HT broadwell box.
https://lore.kernel.org/lkml/20200915165807.kpp7uhiw7l3loofu@ca-dmjordan1.us.oracle.com/

Hugh Dickins helped on the patch polish, thanks!

[alex.shi@linux.alibaba.com: fix comment typo]
  Link: https://lkml.kernel.org/r/5b085715-292a-4b43-50b3-d73dc90d1de5@linux.alibaba.com
[alex.shi@linux.alibaba.com: use page_memcg()]
  Link: https://lkml.kernel.org/r/5a4c2b72-7ee8-2478-fc0e-85eb83aafec4@linux.alibaba.com

Link: https://lkml.kernel.org/r/1604566549-62481-18-git-send-email-alex.shi@linux.alibaba.com
Signed-off-by: Alex Shi <alex.shi@linux.alibaba.com>
Acked-by: Hugh Dickins <hughd@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rong Chen <rong.a.chen@intel.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
Cc: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: "Huang, Ying" <ying.huang@intel.com>
Cc: Jann Horn <jannh@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mika Penttilä <mika.penttila@nextfour.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Yang <richard.weiyang@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alex Shi 2020-12-15 12:34:29 -08:00 committed by Linus Torvalds
parent fc574c2355
commit 6168d0da2b
10 changed files with 275 additions and 126 deletions

View File

@ -491,6 +491,19 @@ struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm);
struct mem_cgroup *get_mem_cgroup_from_page(struct page *page);
struct lruvec *lock_page_lruvec(struct page *page);
struct lruvec *lock_page_lruvec_irq(struct page *page);
struct lruvec *lock_page_lruvec_irqsave(struct page *page,
unsigned long *flags);
#ifdef CONFIG_DEBUG_VM
void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page);
#else
static inline void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page)
{
}
#endif
static inline
struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css){
return css ? container_of(css, struct mem_cgroup, css) : NULL;
@ -996,6 +1009,31 @@ static inline void mem_cgroup_put(struct mem_cgroup *memcg)
{
}
static inline struct lruvec *lock_page_lruvec(struct page *page)
{
struct pglist_data *pgdat = page_pgdat(page);
spin_lock(&pgdat->__lruvec.lru_lock);
return &pgdat->__lruvec;
}
static inline struct lruvec *lock_page_lruvec_irq(struct page *page)
{
struct pglist_data *pgdat = page_pgdat(page);
spin_lock_irq(&pgdat->__lruvec.lru_lock);
return &pgdat->__lruvec;
}
static inline struct lruvec *lock_page_lruvec_irqsave(struct page *page,
unsigned long *flagsp)
{
struct pglist_data *pgdat = page_pgdat(page);
spin_lock_irqsave(&pgdat->__lruvec.lru_lock, *flagsp);
return &pgdat->__lruvec;
}
static inline struct mem_cgroup *
mem_cgroup_iter(struct mem_cgroup *root,
struct mem_cgroup *prev,
@ -1215,6 +1253,10 @@ static inline
void count_memcg_event_mm(struct mm_struct *mm, enum vm_event_item idx)
{
}
static inline void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page)
{
}
#endif /* CONFIG_MEMCG */
/* idx can be of type enum memcg_stat_item or node_stat_item */
@ -1296,6 +1338,22 @@ static inline struct lruvec *parent_lruvec(struct lruvec *lruvec)
return mem_cgroup_lruvec(memcg, lruvec_pgdat(lruvec));
}
static inline void unlock_page_lruvec(struct lruvec *lruvec)
{
spin_unlock(&lruvec->lru_lock);
}
static inline void unlock_page_lruvec_irq(struct lruvec *lruvec)
{
spin_unlock_irq(&lruvec->lru_lock);
}
static inline void unlock_page_lruvec_irqrestore(struct lruvec *lruvec,
unsigned long flags)
{
spin_unlock_irqrestore(&lruvec->lru_lock, flags);
}
#ifdef CONFIG_CGROUP_WRITEBACK
struct wb_domain *mem_cgroup_wb_domain(struct bdi_writeback *wb);

View File

@ -276,6 +276,8 @@ enum lruvec_flags {
struct lruvec {
struct list_head lists[NR_LRU_LISTS];
/* per lruvec lru_lock for memcg */
spinlock_t lru_lock;
/*
* These track the cost of reclaiming one LRU - file or anon -
* over the other. As the observed cost of reclaiming one LRU
@ -782,7 +784,6 @@ typedef struct pglist_data {
/* Write-intensive fields used by page reclaim */
ZONE_PADDING(_pad1_)
spinlock_t lru_lock;
#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
/*

View File

@ -804,7 +804,7 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
unsigned long nr_scanned = 0, nr_isolated = 0;
struct lruvec *lruvec;
unsigned long flags = 0;
bool locked = false;
struct lruvec *locked = NULL;
struct page *page = NULL, *valid_page = NULL;
unsigned long start_pfn = low_pfn;
bool skip_on_failure = false;
@ -868,11 +868,20 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
* contention, to give chance to IRQs. Abort completely if
* a fatal signal is pending.
*/
if (!(low_pfn % SWAP_CLUSTER_MAX)
&& compact_unlock_should_abort(&pgdat->lru_lock,
flags, &locked, cc)) {
low_pfn = 0;
goto fatal_pending;
if (!(low_pfn % SWAP_CLUSTER_MAX)) {
if (locked) {
unlock_page_lruvec_irqrestore(locked, flags);
locked = NULL;
}
if (fatal_signal_pending(current)) {
cc->contended = true;
low_pfn = 0;
goto fatal_pending;
}
cond_resched();
}
if (!pfn_valid_within(low_pfn))
@ -944,9 +953,8 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
if (unlikely(__PageMovable(page)) &&
!PageIsolated(page)) {
if (locked) {
spin_unlock_irqrestore(&pgdat->lru_lock,
flags);
locked = false;
unlock_page_lruvec_irqrestore(locked, flags);
locked = NULL;
}
if (!isolate_movable_page(page, isolate_mode))
@ -987,10 +995,19 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
if (!TestClearPageLRU(page))
goto isolate_fail_put;
rcu_read_lock();
lruvec = mem_cgroup_page_lruvec(page, pgdat);
/* If we already hold the lock, we can skip some rechecking */
if (!locked) {
locked = compact_lock_irqsave(&pgdat->lru_lock,
&flags, cc);
if (lruvec != locked) {
if (locked)
unlock_page_lruvec_irqrestore(locked, flags);
compact_lock_irqsave(&lruvec->lru_lock, &flags, cc);
locked = lruvec;
rcu_read_unlock();
lruvec_memcg_debug(lruvec, page);
/* Try get exclusive access under lock */
if (!skip_updated) {
@ -1009,9 +1026,8 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn,
SetPageLRU(page);
goto isolate_fail_put;
}
}
lruvec = mem_cgroup_page_lruvec(page, pgdat);
} else
rcu_read_unlock();
/* The whole page is taken off the LRU; skip the tail pages. */
if (PageCompound(page))
@ -1045,8 +1061,8 @@ isolate_success:
isolate_fail_put:
/* Avoid potential deadlock in freeing page under lru_lock */
if (locked) {
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
locked = false;
unlock_page_lruvec_irqrestore(locked, flags);
locked = NULL;
}
put_page(page);
@ -1061,8 +1077,8 @@ isolate_fail:
*/
if (nr_isolated) {
if (locked) {
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
locked = false;
unlock_page_lruvec_irqrestore(locked, flags);
locked = NULL;
}
putback_movable_pages(&cc->migratepages);
cc->nr_migratepages = 0;
@ -1090,7 +1106,7 @@ isolate_fail:
isolate_abort:
if (locked)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
unlock_page_lruvec_irqrestore(locked, flags);
if (page) {
SetPageLRU(page);
put_page(page);

View File

@ -2365,7 +2365,7 @@ static void lru_add_page_tail(struct page *head, struct page *tail,
VM_BUG_ON_PAGE(!PageHead(head), head);
VM_BUG_ON_PAGE(PageCompound(tail), head);
VM_BUG_ON_PAGE(PageLRU(tail), head);
lockdep_assert_held(&lruvec_pgdat(lruvec)->lru_lock);
lockdep_assert_held(&lruvec->lru_lock);
if (list) {
/* page reclaim is reclaiming a huge page */
@ -2449,7 +2449,6 @@ static void __split_huge_page(struct page *page, struct list_head *list,
pgoff_t end)
{
struct page *head = compound_head(page);
pg_data_t *pgdat = page_pgdat(head);
struct lruvec *lruvec;
struct address_space *swap_cache = NULL;
unsigned long offset = 0;
@ -2467,10 +2466,8 @@ static void __split_huge_page(struct page *page, struct list_head *list,
xa_lock(&swap_cache->i_pages);
}
/* prevent PageLRU to go away from under us, and freeze lru stats */
spin_lock(&pgdat->lru_lock);
lruvec = mem_cgroup_page_lruvec(head, pgdat);
/* lock lru list/PageCompound, ref freezed by page_ref_freeze */
lruvec = lock_page_lruvec(head);
for (i = nr - 1; i >= 1; i--) {
__split_huge_page_tail(head, i, lruvec, list);
@ -2491,7 +2488,7 @@ static void __split_huge_page(struct page *page, struct list_head *list,
}
ClearPageCompound(head);
spin_unlock(&pgdat->lru_lock);
unlock_page_lruvec(lruvec);
/* Caller disabled irqs, so they are still disabled here */
split_page_owner(head, nr);

View File

@ -20,6 +20,9 @@
* Lockless page tracking & accounting
* Unified hierarchy configuration model
* Copyright (C) 2015 Red Hat, Inc., Johannes Weiner
*
* Per memcg lru locking
* Copyright (C) 2020 Alibaba, Inc, Alex Shi
*/
#include <linux/page_counter.h>
@ -1330,6 +1333,23 @@ int mem_cgroup_scan_tasks(struct mem_cgroup *memcg,
return ret;
}
#ifdef CONFIG_DEBUG_VM
void lruvec_memcg_debug(struct lruvec *lruvec, struct page *page)
{
struct mem_cgroup *memcg;
if (mem_cgroup_disabled())
return;
memcg = page_memcg(page);
if (!memcg)
VM_BUG_ON_PAGE(lruvec_memcg(lruvec) != root_mem_cgroup, page);
else
VM_BUG_ON_PAGE(lruvec_memcg(lruvec) != memcg, page);
}
#endif
/**
* mem_cgroup_page_lruvec - return lruvec for isolating/putting an LRU page
* @page: the page
@ -1370,6 +1390,60 @@ out:
return lruvec;
}
/**
* lock_page_lruvec - lock and return lruvec for a given page.
* @page: the page
*
* This series functions should be used in either conditions:
* PageLRU is cleared or unset
* or page->_refcount is zero
* or page is locked.
*/
struct lruvec *lock_page_lruvec(struct page *page)
{
struct lruvec *lruvec;
struct pglist_data *pgdat = page_pgdat(page);
rcu_read_lock();
lruvec = mem_cgroup_page_lruvec(page, pgdat);
spin_lock(&lruvec->lru_lock);
rcu_read_unlock();
lruvec_memcg_debug(lruvec, page);
return lruvec;
}
struct lruvec *lock_page_lruvec_irq(struct page *page)
{
struct lruvec *lruvec;
struct pglist_data *pgdat = page_pgdat(page);
rcu_read_lock();
lruvec = mem_cgroup_page_lruvec(page, pgdat);
spin_lock_irq(&lruvec->lru_lock);
rcu_read_unlock();
lruvec_memcg_debug(lruvec, page);
return lruvec;
}
struct lruvec *lock_page_lruvec_irqsave(struct page *page, unsigned long *flags)
{
struct lruvec *lruvec;
struct pglist_data *pgdat = page_pgdat(page);
rcu_read_lock();
lruvec = mem_cgroup_page_lruvec(page, pgdat);
spin_lock_irqsave(&lruvec->lru_lock, *flags);
rcu_read_unlock();
lruvec_memcg_debug(lruvec, page);
return lruvec;
}
/**
* mem_cgroup_update_lru_size - account for adding or removing an lru page
* @lruvec: mem_cgroup per zone lru vector
@ -3281,10 +3355,8 @@ void obj_cgroup_uncharge(struct obj_cgroup *objcg, size_t size)
#endif /* CONFIG_MEMCG_KMEM */
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
/*
* Because tail pages are not marked as "used", set it. We're under
* pgdat->lru_lock and migration entries setup in all page mappings.
* Because page_memcg(head) is not set on compound tails, set it now.
*/
void mem_cgroup_split_huge_fixup(struct page *head)
{

View File

@ -262,12 +262,12 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
int nr = pagevec_count(pvec);
int delta_munlocked = -nr;
struct pagevec pvec_putback;
struct lruvec *lruvec = NULL;
int pgrescued = 0;
pagevec_init(&pvec_putback);
/* Phase 1: page isolation */
spin_lock_irq(&zone->zone_pgdat->lru_lock);
for (i = 0; i < nr; i++) {
struct page *page = pvec->pages[i];
@ -277,10 +277,16 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
* so we can spare the get_page() here.
*/
if (TestClearPageLRU(page)) {
struct lruvec *lruvec;
struct lruvec *new_lruvec;
new_lruvec = mem_cgroup_page_lruvec(page,
page_pgdat(page));
if (new_lruvec != lruvec) {
if (lruvec)
unlock_page_lruvec_irq(lruvec);
lruvec = lock_page_lruvec_irq(page);
}
lruvec = mem_cgroup_page_lruvec(page,
page_pgdat(page));
del_page_from_lru_list(page, lruvec,
page_lru(page));
continue;
@ -299,8 +305,12 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
pagevec_add(&pvec_putback, pvec->pages[i]);
pvec->pages[i] = NULL;
}
__mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
spin_unlock_irq(&zone->zone_pgdat->lru_lock);
if (lruvec) {
__mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
unlock_page_lruvec_irq(lruvec);
} else if (delta_munlocked) {
mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
}
/* Now we can release pins of pages that we are not munlocking */
pagevec_release(&pvec_putback);

View File

@ -77,6 +77,7 @@ void lruvec_init(struct lruvec *lruvec)
enum lru_list lru;
memset(lruvec, 0, sizeof(struct lruvec));
spin_lock_init(&lruvec->lru_lock);
for_each_lru(lru)
INIT_LIST_HEAD(&lruvec->lists[lru]);

View File

@ -6870,7 +6870,6 @@ static void __meminit pgdat_init_internals(struct pglist_data *pgdat)
init_waitqueue_head(&pgdat->pfmemalloc_wait);
pgdat_page_ext_init(pgdat);
spin_lock_init(&pgdat->lru_lock);
lruvec_init(&pgdat->__lruvec);
}

116
mm/swap.c
View File

@ -79,16 +79,14 @@ static DEFINE_PER_CPU(struct lru_pvecs, lru_pvecs) = {
static void __page_cache_release(struct page *page)
{
if (PageLRU(page)) {
pg_data_t *pgdat = page_pgdat(page);
struct lruvec *lruvec;
unsigned long flags;
spin_lock_irqsave(&pgdat->lru_lock, flags);
lruvec = mem_cgroup_page_lruvec(page, pgdat);
lruvec = lock_page_lruvec_irqsave(page, &flags);
VM_BUG_ON_PAGE(!PageLRU(page), page);
__ClearPageLRU(page);
del_page_from_lru_list(page, lruvec, page_off_lru(page));
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
unlock_page_lruvec_irqrestore(lruvec, flags);
}
__ClearPageWaiters(page);
}
@ -207,32 +205,30 @@ static void pagevec_lru_move_fn(struct pagevec *pvec,
void (*move_fn)(struct page *page, struct lruvec *lruvec))
{
int i;
struct pglist_data *pgdat = NULL;
struct lruvec *lruvec;
struct lruvec *lruvec = NULL;
unsigned long flags = 0;
for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
struct pglist_data *pagepgdat = page_pgdat(page);
if (pagepgdat != pgdat) {
if (pgdat)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
pgdat = pagepgdat;
spin_lock_irqsave(&pgdat->lru_lock, flags);
}
struct lruvec *new_lruvec;
/* block memcg migration during page moving between lru */
if (!TestClearPageLRU(page))
continue;
lruvec = mem_cgroup_page_lruvec(page, pgdat);
new_lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page));
if (lruvec != new_lruvec) {
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = lock_page_lruvec_irqsave(page, &flags);
}
(*move_fn)(page, lruvec);
SetPageLRU(page);
}
if (pgdat)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags);
release_pages(pvec->pages, pvec->nr);
pagevec_reinit(pvec);
}
@ -274,9 +270,15 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
{
do {
unsigned long lrusize;
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
spin_lock_irq(&pgdat->lru_lock);
/*
* Hold lruvec->lru_lock is safe here, since
* 1) The pinned lruvec in reclaim, or
* 2) From a pre-LRU page during refault (which also holds the
* rcu lock, so would be safe even if the page was on the LRU
* and could move simultaneously to a new lruvec).
*/
spin_lock_irq(&lruvec->lru_lock);
/* Record cost event */
if (file)
lruvec->file_cost += nr_pages;
@ -300,7 +302,7 @@ void lru_note_cost(struct lruvec *lruvec, bool file, unsigned int nr_pages)
lruvec->file_cost /= 2;
lruvec->anon_cost /= 2;
}
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&lruvec->lru_lock);
} while ((lruvec = parent_lruvec(lruvec)));
}
@ -364,13 +366,15 @@ static inline void activate_page_drain(int cpu)
static void activate_page(struct page *page)
{
pg_data_t *pgdat = page_pgdat(page);
struct lruvec *lruvec;
page = compound_head(page);
spin_lock_irq(&pgdat->lru_lock);
if (PageLRU(page))
__activate_page(page, mem_cgroup_page_lruvec(page, pgdat));
spin_unlock_irq(&pgdat->lru_lock);
if (TestClearPageLRU(page)) {
lruvec = lock_page_lruvec_irq(page);
__activate_page(page, lruvec);
unlock_page_lruvec_irq(lruvec);
SetPageLRU(page);
}
}
#endif
@ -860,8 +864,7 @@ void release_pages(struct page **pages, int nr)
{
int i;
LIST_HEAD(pages_to_free);
struct pglist_data *locked_pgdat = NULL;
struct lruvec *lruvec;
struct lruvec *lruvec = NULL;
unsigned long flags;
unsigned int lock_batch;
@ -871,11 +874,11 @@ void release_pages(struct page **pages, int nr)
/*
* Make sure the IRQ-safe lock-holding time does not get
* excessive with a continuous string of pages from the
* same pgdat. The lock is held only if pgdat != NULL.
* same lruvec. The lock is held only if lruvec != NULL.
*/
if (locked_pgdat && ++lock_batch == SWAP_CLUSTER_MAX) {
spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags);
locked_pgdat = NULL;
if (lruvec && ++lock_batch == SWAP_CLUSTER_MAX) {
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL;
}
page = compound_head(page);
@ -883,10 +886,9 @@ void release_pages(struct page **pages, int nr)
continue;
if (is_zone_device_page(page)) {
if (locked_pgdat) {
spin_unlock_irqrestore(&locked_pgdat->lru_lock,
flags);
locked_pgdat = NULL;
if (lruvec) {
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL;
}
/*
* ZONE_DEVICE pages that return 'false' from
@ -907,27 +909,27 @@ void release_pages(struct page **pages, int nr)
continue;
if (PageCompound(page)) {
if (locked_pgdat) {
spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags);
locked_pgdat = NULL;
if (lruvec) {
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = NULL;
}
__put_compound_page(page);
continue;
}
if (PageLRU(page)) {
struct pglist_data *pgdat = page_pgdat(page);
struct lruvec *new_lruvec;
if (pgdat != locked_pgdat) {
if (locked_pgdat)
spin_unlock_irqrestore(&locked_pgdat->lru_lock,
new_lruvec = mem_cgroup_page_lruvec(page,
page_pgdat(page));
if (new_lruvec != lruvec) {
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec,
flags);
lock_batch = 0;
locked_pgdat = pgdat;
spin_lock_irqsave(&locked_pgdat->lru_lock, flags);
lruvec = lock_page_lruvec_irqsave(page, &flags);
}
lruvec = mem_cgroup_page_lruvec(page, locked_pgdat);
VM_BUG_ON_PAGE(!PageLRU(page), page);
__ClearPageLRU(page);
del_page_from_lru_list(page, lruvec, page_off_lru(page));
@ -937,8 +939,8 @@ void release_pages(struct page **pages, int nr)
list_add(&page->lru, &pages_to_free);
}
if (locked_pgdat)
spin_unlock_irqrestore(&locked_pgdat->lru_lock, flags);
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags);
mem_cgroup_uncharge_list(&pages_to_free);
free_unref_page_list(&pages_to_free);
@ -1026,26 +1028,24 @@ static void __pagevec_lru_add_fn(struct page *page, struct lruvec *lruvec)
void __pagevec_lru_add(struct pagevec *pvec)
{
int i;
struct pglist_data *pgdat = NULL;
struct lruvec *lruvec;
struct lruvec *lruvec = NULL;
unsigned long flags = 0;
for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
struct pglist_data *pagepgdat = page_pgdat(page);
struct lruvec *new_lruvec;
if (pagepgdat != pgdat) {
if (pgdat)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
pgdat = pagepgdat;
spin_lock_irqsave(&pgdat->lru_lock, flags);
new_lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page));
if (lruvec != new_lruvec) {
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags);
lruvec = lock_page_lruvec_irqsave(page, &flags);
}
lruvec = mem_cgroup_page_lruvec(page, pgdat);
__pagevec_lru_add_fn(page, lruvec);
}
if (pgdat)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
if (lruvec)
unlock_page_lruvec_irqrestore(lruvec, flags);
release_pages(pvec->pages, pvec->nr);
pagevec_reinit(pvec);
}

View File

@ -1764,14 +1764,12 @@ int isolate_lru_page(struct page *page)
WARN_RATELIMIT(PageTail(page), "trying to isolate tail page");
if (TestClearPageLRU(page)) {
pg_data_t *pgdat = page_pgdat(page);
struct lruvec *lruvec;
get_page(page);
lruvec = mem_cgroup_page_lruvec(page, pgdat);
spin_lock_irq(&pgdat->lru_lock);
lruvec = lock_page_lruvec_irq(page);
del_page_from_lru_list(page, lruvec, page_lru(page));
spin_unlock_irq(&pgdat->lru_lock);
unlock_page_lruvec_irq(lruvec);
ret = 0;
}
@ -1838,7 +1836,6 @@ static int too_many_isolated(struct pglist_data *pgdat, int file,
static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
struct list_head *list)
{
struct pglist_data *pgdat = lruvec_pgdat(lruvec);
int nr_pages, nr_moved = 0;
LIST_HEAD(pages_to_free);
struct page *page;
@ -1849,9 +1846,9 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
VM_BUG_ON_PAGE(PageLRU(page), page);
list_del(&page->lru);
if (unlikely(!page_evictable(page))) {
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&lruvec->lru_lock);
putback_lru_page(page);
spin_lock_irq(&pgdat->lru_lock);
spin_lock_irq(&lruvec->lru_lock);
continue;
}
@ -1873,9 +1870,9 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
__ClearPageActive(page);
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&lruvec->lru_lock);
destroy_compound_page(page);
spin_lock_irq(&pgdat->lru_lock);
spin_lock_irq(&lruvec->lru_lock);
} else
list_add(&page->lru, &pages_to_free);
@ -1952,7 +1949,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
lru_add_drain();
spin_lock_irq(&pgdat->lru_lock);
spin_lock_irq(&lruvec->lru_lock);
nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &page_list,
&nr_scanned, sc, lru);
@ -1964,14 +1961,14 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
__count_memcg_events(lruvec_memcg(lruvec), item, nr_scanned);
__count_vm_events(PGSCAN_ANON + file, nr_scanned);
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&lruvec->lru_lock);
if (nr_taken == 0)
return 0;
nr_reclaimed = shrink_page_list(&page_list, pgdat, sc, &stat, false);
spin_lock_irq(&pgdat->lru_lock);
spin_lock_irq(&lruvec->lru_lock);
move_pages_to_lru(lruvec, &page_list);
__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
@ -1980,7 +1977,7 @@ shrink_inactive_list(unsigned long nr_to_scan, struct lruvec *lruvec,
__count_vm_events(item, nr_reclaimed);
__count_memcg_events(lruvec_memcg(lruvec), item, nr_reclaimed);
__count_vm_events(PGSTEAL_ANON + file, nr_reclaimed);
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&lruvec->lru_lock);
lru_note_cost(lruvec, file, stat.nr_pageout);
mem_cgroup_uncharge_list(&page_list);
@ -2033,7 +2030,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
lru_add_drain();
spin_lock_irq(&pgdat->lru_lock);
spin_lock_irq(&lruvec->lru_lock);
nr_taken = isolate_lru_pages(nr_to_scan, lruvec, &l_hold,
&nr_scanned, sc, lru);
@ -2044,7 +2041,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
__count_vm_events(PGREFILL, nr_scanned);
__count_memcg_events(lruvec_memcg(lruvec), PGREFILL, nr_scanned);
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&lruvec->lru_lock);
while (!list_empty(&l_hold)) {
cond_resched();
@ -2090,7 +2087,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
/*
* Move pages back to the lru list.
*/
spin_lock_irq(&pgdat->lru_lock);
spin_lock_irq(&lruvec->lru_lock);
nr_activate = move_pages_to_lru(lruvec, &l_active);
nr_deactivate = move_pages_to_lru(lruvec, &l_inactive);
@ -2101,7 +2098,7 @@ static void shrink_active_list(unsigned long nr_to_scan,
__count_memcg_events(lruvec_memcg(lruvec), PGDEACTIVATE, nr_deactivate);
__mod_node_page_state(pgdat, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&lruvec->lru_lock);
mem_cgroup_uncharge_list(&l_active);
free_unref_page_list(&l_active);
@ -2689,10 +2686,10 @@ again:
/*
* Determine the scan balance between anon and file LRUs.
*/
spin_lock_irq(&pgdat->lru_lock);
spin_lock_irq(&target_lruvec->lru_lock);
sc->anon_cost = target_lruvec->anon_cost;
sc->file_cost = target_lruvec->file_cost;
spin_unlock_irq(&pgdat->lru_lock);
spin_unlock_irq(&target_lruvec->lru_lock);
/*
* Target desirable inactive:active list ratios for the anon
@ -4268,16 +4265,15 @@ int node_reclaim(struct pglist_data *pgdat, gfp_t gfp_mask, unsigned int order)
*/
void check_move_unevictable_pages(struct pagevec *pvec)
{
struct lruvec *lruvec;
struct pglist_data *pgdat = NULL;
struct lruvec *lruvec = NULL;
int pgscanned = 0;
int pgrescued = 0;
int i;
for (i = 0; i < pvec->nr; i++) {
struct page *page = pvec->pages[i];
struct pglist_data *pagepgdat = page_pgdat(page);
int nr_pages;
struct lruvec *new_lruvec;
if (PageTransTail(page))
continue;
@ -4289,13 +4285,12 @@ void check_move_unevictable_pages(struct pagevec *pvec)
if (!TestClearPageLRU(page))
continue;
if (pagepgdat != pgdat) {
if (pgdat)
spin_unlock_irq(&pgdat->lru_lock);
pgdat = pagepgdat;
spin_lock_irq(&pgdat->lru_lock);
new_lruvec = mem_cgroup_page_lruvec(page, page_pgdat(page));
if (lruvec != new_lruvec) {
if (lruvec)
unlock_page_lruvec_irq(lruvec);
lruvec = lock_page_lruvec_irq(page);
}
lruvec = mem_cgroup_page_lruvec(page, pgdat);
if (page_evictable(page) && PageUnevictable(page)) {
enum lru_list lru = page_lru_base_type(page);
@ -4309,10 +4304,10 @@ void check_move_unevictable_pages(struct pagevec *pvec)
SetPageLRU(page);
}
if (pgdat) {
if (lruvec) {
__count_vm_events(UNEVICTABLE_PGRESCUED, pgrescued);
__count_vm_events(UNEVICTABLE_PGSCANNED, pgscanned);
spin_unlock_irq(&pgdat->lru_lock);
unlock_page_lruvec_irq(lruvec);
} else if (pgscanned) {
count_vm_events(UNEVICTABLE_PGSCANNED, pgscanned);
}