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| author | Mel Gorman <mgorman@suse.de> | 2012-10-08 16:32:30 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-09 16:22:48 +0900 |
| commit | 3cc668f4e30fbd97b3c0574d8cac7a83903c9bc7 (patch) | |
| tree | 851c570e1af7c3c888d7106d3942ab861039b3b9 | |
| parent | e64c5237cf6ff474cb2f3f832f48f2b441dd9979 (diff) | |
| download | lwn-3cc668f4e30fbd97b3c0574d8cac7a83903c9bc7.tar.gz lwn-3cc668f4e30fbd97b3c0574d8cac7a83903c9bc7.zip | |
mm: compaction: move fatal signal check out of compact_checklock_irqsave
Commit c67fe3752abe ("mm: compaction: Abort async compaction if locks
are contended or taking too long") addressed a lock contention problem
in compaction by introducing compact_checklock_irqsave() that effecively
aborting async compaction in the event of compaction.
To preserve existing behaviour it also moved a fatal_signal_pending()
check into compact_checklock_irqsave() but that is very misleading. It
"hides" the check within a locking function but has nothing to do with
locking as such. It just happens to work in a desirable fashion.
This patch moves the fatal_signal_pending() check to
isolate_migratepages_range() where it belongs. Arguably the same check
should also happen when isolating pages for freeing but it's overkill.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Cc: Rik van Riel <riel@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/compaction.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/mm/compaction.c b/mm/compaction.c index 0649cc1b3479..78075a268399 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -75,8 +75,6 @@ static bool compact_checklock_irqsave(spinlock_t *lock, unsigned long *flags, } cond_resched(); - if (fatal_signal_pending(current)) - return false; } if (!locked) @@ -363,7 +361,7 @@ isolate_migratepages_range(struct zone *zone, struct compact_control *cc, /* Check if it is ok to still hold the lock */ locked = compact_checklock_irqsave(&zone->lru_lock, &flags, locked, cc); - if (!locked) + if (!locked || fatal_signal_pending(current)) break; /* |