From: Andrew Morton <akpm@linux-foundation.org>
To: aarcange@redhat.com, akpm@linux-foundation.org,
alex.shi@linux.alibaba.com, alexander.duyck@gmail.com,
aryabinin@virtuozzo.com, daniel.m.jordan@oracle.com,
hannes@cmpxchg.org, hughd@google.com, iamjoonsoo.kim@lge.com,
jannh@google.com, khlebnikov@yandex-team.ru,
kirill.shutemov@linux.intel.com, kirill@shutemov.name,
linux-mm@kvack.org, mgorman@techsingularity.net,
mhocko@kernel.org, mhocko@suse.com, mika.penttila@nextfour.com,
minchan@kernel.org, mm-commits@vger.kernel.org,
richard.weiyang@gmail.com, rong.a.chen@intel.com,
shakeelb@google.com, tglx@linutronix.de, tj@kernel.org,
torvalds@linux-foundation.org, vbabka@suse.cz,
vdavydov.dev@gmail.com, willy@infradead.org,
yang.shi@linux.alibaba.com, ying.huang@intel.com
Subject: [patch 16/19] mm/swap.c: serialize memcg changes in pagevec_lru_move_fn
Date: Tue, 15 Dec 2020 14:21:18 -0800 [thread overview]
Message-ID: <20201215222118.m_yVR3JBW%akpm@linux-foundation.org> (raw)
In-Reply-To: <20201215123253.954eca9a5ef4c0d52fd381fa@linux-foundation.org>
From: Alex Shi <alex.shi@linux.alibaba.com>
Subject: mm/swap.c: serialize memcg changes in pagevec_lru_move_fn
Hugh Dickins' found a memcg change bug on original version: If we want to
change the pgdat->lru_lock to memcg's lruvec lock, we have to serialize
mem_cgroup_move_account during pagevec_lru_move_fn. The possible bad
scenario would like:
cpu 0 cpu 1
lruvec = mem_cgroup_page_lruvec()
if (!isolate_lru_page())
mem_cgroup_move_account
spin_lock_irqsave(&lruvec->lru_lock <== wrong lock.
So we need TestClearPageLRU to block isolate_lru_page(), that serializes
the memcg change. and then removing the PageLRU check in move_fn callee
as the consequence.
__pagevec_lru_add_fn() is different from the others, because the pages it
deals with are, by definition, not yet on the lru. TestClearPageLRU is
not needed and would not work, so __pagevec_lru_add() goes its own way.
Link: https://lkml.kernel.org/r/1604566549-62481-17-git-send-email-alex.shi@linux.alibaba.com
Reported-by: Hugh Dickins <hughd@google.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>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Alexander Duyck <alexander.duyck@gmail.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: "Chen, Rong A" <rong.a.chen@intel.com>
Cc: Daniel Jordan <daniel.m.jordan@oracle.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: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Mel Gorman <mgorman@techsingularity.net>
Cc: Michal Hocko <mhocko@kernel.org>
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: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Wei Yang <richard.weiyang@gmail.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/swap.c | 44 +++++++++++++++++++++++++++++++++++---------
1 file changed, 35 insertions(+), 9 deletions(-)
--- a/mm/swap.c~mm-swapc-serialize-memcg-changes-in-pagevec_lru_move_fn
+++ a/mm/swap.c
@@ -222,8 +222,14 @@ static void pagevec_lru_move_fn(struct p
spin_lock_irqsave(&pgdat->lru_lock, flags);
}
+ /* block memcg migration during page moving between lru */
+ if (!TestClearPageLRU(page))
+ continue;
+
lruvec = mem_cgroup_page_lruvec(page, pgdat);
(*move_fn)(page, lruvec);
+
+ SetPageLRU(page);
}
if (pgdat)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
@@ -233,7 +239,7 @@ static void pagevec_lru_move_fn(struct p
static void pagevec_move_tail_fn(struct page *page, struct lruvec *lruvec)
{
- if (PageLRU(page) && !PageUnevictable(page)) {
+ if (!PageUnevictable(page)) {
del_page_from_lru_list(page, lruvec, page_lru(page));
ClearPageActive(page);
add_page_to_lru_list_tail(page, lruvec, page_lru(page));
@@ -306,7 +312,7 @@ void lru_note_cost_page(struct page *pag
static void __activate_page(struct page *page, struct lruvec *lruvec)
{
- if (PageLRU(page) && !PageActive(page) && !PageUnevictable(page)) {
+ if (!PageActive(page) && !PageUnevictable(page)) {
int lru = page_lru_base_type(page);
int nr_pages = thp_nr_pages(page);
@@ -362,7 +368,8 @@ static void activate_page(struct page *p
page = compound_head(page);
spin_lock_irq(&pgdat->lru_lock);
- __activate_page(page, mem_cgroup_page_lruvec(page, pgdat));
+ if (PageLRU(page))
+ __activate_page(page, mem_cgroup_page_lruvec(page, pgdat));
spin_unlock_irq(&pgdat->lru_lock);
}
#endif
@@ -519,9 +526,6 @@ static void lru_deactivate_file_fn(struc
bool active;
int nr_pages = thp_nr_pages(page);
- if (!PageLRU(page))
- return;
-
if (PageUnevictable(page))
return;
@@ -562,7 +566,7 @@ static void lru_deactivate_file_fn(struc
static void lru_deactivate_fn(struct page *page, struct lruvec *lruvec)
{
- if (PageLRU(page) && PageActive(page) && !PageUnevictable(page)) {
+ if (PageActive(page) && !PageUnevictable(page)) {
int lru = page_lru_base_type(page);
int nr_pages = thp_nr_pages(page);
@@ -579,7 +583,7 @@ static void lru_deactivate_fn(struct pag
static void lru_lazyfree_fn(struct page *page, struct lruvec *lruvec)
{
- if (PageLRU(page) && PageAnon(page) && PageSwapBacked(page) &&
+ if (PageAnon(page) && PageSwapBacked(page) &&
!PageSwapCache(page) && !PageUnevictable(page)) {
bool active = PageActive(page);
int nr_pages = thp_nr_pages(page);
@@ -1021,7 +1025,29 @@ static void __pagevec_lru_add_fn(struct
*/
void __pagevec_lru_add(struct pagevec *pvec)
{
- pagevec_lru_move_fn(pvec, __pagevec_lru_add_fn);
+ int i;
+ struct pglist_data *pgdat = NULL;
+ struct lruvec *lruvec;
+ 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);
+ }
+
+ lruvec = mem_cgroup_page_lruvec(page, pgdat);
+ __pagevec_lru_add_fn(page, lruvec);
+ }
+ if (pgdat)
+ spin_unlock_irqrestore(&pgdat->lru_lock, flags);
+ release_pages(pvec->pages, pvec->nr);
+ pagevec_reinit(pvec);
}
/**
_
next prev parent reply other threads:[~2020-12-15 22:22 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-15 20:32 incoming Andrew Morton
2020-12-15 20:33 ` [patch 01/19] mm/thp: move lru_add_page_tail() to huge_memory.c Andrew Morton
2020-12-15 20:33 ` [patch 02/19] mm/thp: use head for head page in lru_add_page_tail() Andrew Morton
2020-12-15 20:33 ` [patch 03/19] mm/thp: simplify lru_add_page_tail() Andrew Morton
2020-12-15 20:33 ` [patch 04/19] mm/thp: narrow lru locking Andrew Morton
2020-12-15 20:33 ` [patch 05/19] mm/vmscan: remove unnecessary lruvec adding Andrew Morton
2020-12-15 20:33 ` [patch 06/19] mm/rmap: stop store reordering issue on page->mapping Andrew Morton
2020-12-15 20:33 ` [patch 07/19] mm: page_idle_get_page() does not need lru_lock Andrew Morton
2020-12-15 20:33 ` [patch 08/19] mm/memcg: add debug checking in lock_page_memcg Andrew Morton
2020-12-15 20:33 ` [patch 09/19] mm/swap.c: fold vm event PGROTATED into pagevec_move_tail_fn Andrew Morton
2020-12-15 20:34 ` [patch 11/19] mm/vmscan: remove lruvec reget in move_pages_to_lru Andrew Morton
2020-12-15 20:34 ` [patch 12/19] mm/mlock: remove lru_lock on TestClearPageMlocked Andrew Morton
2020-12-15 20:34 ` [patch 13/19] mm/mlock: remove __munlock_isolate_lru_page() Andrew Morton
2020-12-15 20:34 ` [patch 14/19] mm/lru: introduce TestClearPageLRU() Andrew Morton
2020-12-15 20:34 ` [patch 15/19] mm/compaction: do page isolation first in compaction Andrew Morton
2020-12-15 20:34 ` [patch 16/19] mm/swap.c: serialize memcg changes in pagevec_lru_move_fn Andrew Morton
2020-12-15 20:34 ` [patch 17/19] mm/lru: replace pgdat lru_lock with lruvec lock Andrew Morton
2020-12-15 20:34 ` [patch 18/19] mm/lru: introduce relock_page_lruvec() Andrew Morton
2020-12-15 20:34 ` [patch 19/19] mm/lru: revise the comments of lru_lock Andrew Morton
2020-12-15 21:00 ` incoming Linus Torvalds
2020-12-15 22:20 ` [patch 01/19] mm/thp: move lru_add_page_tail() to huge_memory.c Andrew Morton
2020-12-15 22:20 ` [patch 02/19] mm/thp: use head for head page in lru_add_page_tail() Andrew Morton
2020-12-15 22:20 ` [patch 03/19] mm/thp: simplify lru_add_page_tail() Andrew Morton
2020-12-15 22:20 ` [patch 04/19] mm/thp: narrow lru locking Andrew Morton
2020-12-15 22:20 ` [patch 05/19] mm/vmscan: remove unnecessary lruvec adding Andrew Morton
2020-12-15 22:20 ` [patch 06/19] mm/rmap: stop store reordering issue on page->mapping Andrew Morton
2020-12-15 22:20 ` [patch 07/19] mm: page_idle_get_page() does not need lru_lock Andrew Morton
2020-12-15 22:20 ` [patch 08/19] mm/memcg: add debug checking in lock_page_memcg Andrew Morton
2020-12-15 22:20 ` [patch 09/19] mm/swap.c: fold vm event PGROTATED into pagevec_move_tail_fn Andrew Morton
2020-12-15 22:20 ` [patch 10/19] mm/lru: move lock into lru_note_cost Andrew Morton
2020-12-15 22:20 ` [patch 11/19] mm/vmscan: remove lruvec reget in move_pages_to_lru Andrew Morton
2020-12-15 22:20 ` [patch 12/19] mm/mlock: remove lru_lock on TestClearPageMlocked Andrew Morton
2020-12-15 22:21 ` [patch 13/19] mm/mlock: remove __munlock_isolate_lru_page() Andrew Morton
2020-12-15 22:21 ` [patch 14/19] mm/lru: introduce TestClearPageLRU() Andrew Morton
2020-12-15 22:21 ` [patch 15/19] mm/compaction: do page isolation first in compaction Andrew Morton
2020-12-15 22:21 ` Andrew Morton [this message]
2020-12-15 22:21 ` [patch 17/19] mm/lru: replace pgdat lru_lock with lruvec lock Andrew Morton
2020-12-15 22:21 ` [patch 18/19] mm/lru: introduce relock_page_lruvec() Andrew Morton
2020-12-15 22:21 ` [patch 19/19] mm/lru: revise the comments of lru_lock Andrew Morton
2020-12-15 22:48 ` incoming Linus Torvalds
2020-12-15 22:49 ` incoming Linus Torvalds
2020-12-15 22:55 ` incoming Andrew Morton
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