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mm, pagevec: release/reacquire lru_lock on pgdat change

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With node-lru, the locking is based on the pgdat.  Previously it was
required that a pagevec drain released one zone lru_lock and acquired
another zone lru_lock on every zone change.  Now, it's only necessary if
the node changes.  The end-result is fewer lock release/acquires if the
pages are all on the same node but in different zones.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Mel Gorman <[email protected]>
Acked-by: Minchan Kim <[email protected]>
Acked-by: Johannes Weiner <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2016-07-28 15:47:11 -07:00 • committed by Linus Torvalds
commit 68eb0731c4
1 changed files with 10 additions and 10 deletions
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20
mm/swap.c
View file

@ -179,26 +179,26 @@ static void pagevec_lru_move_fn(struct pagevec *pvec,
void *arg)
{
int i;
struct zone *zone = NULL;
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 zone *pagezone = page_zone(page);
struct pglist_data *pagepgdat = page_pgdat(page);
if (pagezone != zone) {
if (zone)
spin_unlock_irqrestore(zone_lru_lock(zone), flags);
zone = pagezone;
spin_lock_irqsave(zone_lru_lock(zone), flags);
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, zone->zone_pgdat);
lruvec = mem_cgroup_page_lruvec(page, pgdat);
(*move_fn)(page, lruvec, arg);
}
if (zone)
spin_unlock_irqrestore(zone_lru_lock(zone), flags);
if (pgdat)
spin_unlock_irqrestore(&pgdat->lru_lock, flags);
release_pages(pvec->pages, pvec->nr, pvec->cold);
pagevec_reinit(pvec);
}