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| author | Andrew Barry <abarry@cray.com> | 2011-05-24 17:12:52 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-05-25 08:39:36 -0700 |
| commit | cfa54a0fcfc1017c6f122b6f21aaba36daa07f71 (patch) | |
| tree | c6bcc41b79475854254384b7b4912a2101364183 /mm/page_alloc.c | |
| parent | a539f3533b78e39a22723d6d3e1e11b6c14454d9 (diff) | |
| download | lwn-cfa54a0fcfc1017c6f122b6f21aaba36daa07f71.tar.gz lwn-cfa54a0fcfc1017c6f122b6f21aaba36daa07f71.zip | |
mm/page_alloc.c: prevent unending loop in __alloc_pages_slowpath()
I believe I found a problem in __alloc_pages_slowpath, which allows a
process to get stuck endlessly looping, even when lots of memory is
available.
Running an I/O and memory intensive stress-test I see a 0-order page
allocation with __GFP_IO and __GFP_WAIT, running on a system with very
little free memory. Right about the same time that the stress-test gets
killed by the OOM-killer, the utility trying to allocate memory gets stuck
in __alloc_pages_slowpath even though most of the systems memory was freed
by the oom-kill of the stress-test.
The utility ends up looping from the rebalance label down through the
wait_iff_congested continiously. Because order=0,
__alloc_pages_direct_compact skips the call to get_page_from_freelist.
Because all of the reclaimable memory on the system has already been
reclaimed, __alloc_pages_direct_reclaim skips the call to
get_page_from_freelist. Since there is no __GFP_FS flag, the block with
__alloc_pages_may_oom is skipped. The loop hits the wait_iff_congested,
then jumps back to rebalance without ever trying to
get_page_from_freelist. This loop repeats infinitely.
The test case is pretty pathological. Running a mix of I/O stress-tests
that do a lot of fork() and consume all of the system memory, I can pretty
reliably hit this on 600 nodes, in about 12 hours. 32GB/node.
Signed-off-by: Andrew Barry <abarry@cray.com>
Signed-off-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Rik van Riel<riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 10a8c6da385f..2a00f17c3bf4 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2106,6 +2106,7 @@ restart: first_zones_zonelist(zonelist, high_zoneidx, NULL, &preferred_zone); +rebalance: /* This is the last chance, in general, before the goto nopage. */ page = get_page_from_freelist(gfp_mask, nodemask, order, zonelist, high_zoneidx, alloc_flags & ~ALLOC_NO_WATERMARKS, @@ -2113,7 +2114,6 @@ restart: if (page) goto got_pg; -rebalance: /* Allocate without watermarks if the context allows */ if (alloc_flags & ALLOC_NO_WATERMARKS) { page = __alloc_pages_high_priority(gfp_mask, order, |