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mm, vmscan: release/reacquire lru_lock on pgdat change 

With node-lru, the locking is based on the pgdat.  As Minchan pointed
out, there is an opportunity to reduce LRU lock release/acquire in
check_move_unevictable_pages by only changing lock on a pgdat change.

[mgorman@techsingularity.net: remove double initialisation]
  Link: http://lkml.kernel.org/r/20160719074835.GC10438@techsingularity.net
Link: http://lkml.kernel.org/r/1468853426-12858-3-git-send-email-mgorman@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Mel Gorman 2016-07-28 15:47:23 -07:00 committed by Linus Torvalds
parent 22fecdf5e1
commit 785b99febb
1 changed files with 10 additions and 11 deletions
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21
mm/vmscan.c
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@ -3774,24 +3774,23 @@ int page_evictable(struct page *page)
void check_move_unevictable_pages(struct page **pages, int nr_pages)
{
struct lruvec *lruvec;
struct zone *zone = NULL;
struct pglist_data *pgdat = NULL;
int pgscanned = 0;
int pgrescued = 0;
int i;
for (i = 0; i < nr_pages; i++) {
struct page *page = pages[i];
struct zone *pagezone;
struct pglist_data *pagepgdat = page_pgdat(page);
pgscanned++;
pagezone = page_zone(page);
if (pagezone != zone) {
if (zone)
spin_unlock_irq(zone_lru_lock(zone));
zone = pagezone;
spin_lock_irq(zone_lru_lock(zone));
if (pagepgdat != pgdat) {
if (pgdat)
spin_unlock_irq(&pgdat->lru_lock);
pgdat = pagepgdat;
spin_lock_irq(&pgdat->lru_lock);
}
lruvec = mem_cgroup_page_lruvec(page, zone->zone_pgdat);
lruvec = mem_cgroup_page_lruvec(page, pgdat);
if (!PageLRU(page) || !PageUnevictable(page))
continue;
@ -3807,10 +3806,10 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages)
}
}
if (zone) {
if (pgdat) {
__count_vm_events(UNEVICTABLE_PGRESCUED, pgrescued);
__count_vm_events(UNEVICTABLE_PGSCANNED, pgscanned);
spin_unlock_irq(zone_lru_lock(zone));
spin_unlock_irq(&pgdat->lru_lock);
}
}
#endif /* CONFIG_SHMEM */