The patch titled
Subject: mm: page_alloc: __GFP_NOWARN shouldn't suppress stall warnings
has been added to the -mm tree. Its filename is
mm-page_alloc-__gfp_nowarn-shouldnt-suppress-stall-warnings.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-__gfp_nowarn-shouldnt-suppress-stall-warnings.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-__gfp_nowarn-shouldnt-suppress-stall-warnings.patch
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------------------------------------------------------
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: mm: page_alloc: __GFP_NOWARN shouldn't suppress stall warnings
__GFP_NOWARN, which is usually added to avoid warnings from callsites that
expect to fail and have fallbacks, currently also suppresses allocation
stall warnings. These trigger when an allocation is stuck inside the
allocator for 10 seconds or longer.
But there is no class of allocations that can get legitimately stuck in
the allocator for this long. This always indicates a problem.
Always emit stall warnings. Restrict __GFP_NOWARN to alloc failures.
Link: http://lkml.kernel.org/r/20170125181150.GA16398@xxxxxxxxxxx
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/page_alloc.c~mm-page_alloc-__gfp_nowarn-shouldnt-suppress-stall-warnings mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-__gfp_nowarn-shouldnt-suppress-stall-warnings
+++ a/mm/page_alloc.c
@@ -3814,7 +3814,7 @@ retry:
/* Make sure we know about allocations which stall for too long */
if (time_after(jiffies, alloc_start + stall_timeout)) {
- warn_alloc(gfp_mask, ac->nodemask,
+ warn_alloc(gfp_mask & ~__GFP_NOWARN, ac->nodemask,
"page allocation stalls for %ums, order:%u",
jiffies_to_msecs(jiffies-alloc_start), order);
stall_timeout += 10 * HZ;
_
Patches currently in -mm which might be from hannes@xxxxxxxxxxx are
mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes.patch
mm-fix-100%-cpu-kswapd-busyloop-on-unreclaimable-nodes-fix.patch
mm-fix-check-for-reclaimable-pages-in-pf_memalloc-reclaim-throttling.patch
mm-remove-seemingly-spurious-reclaimability-check-from-laptop_mode-gating.patch
mm-remove-unnecessary-reclaimability-check-from-numa-balancing-target.patch
mm-dont-avoid-high-priority-reclaim-on-unreclaimable-nodes.patch
mm-dont-avoid-high-priority-reclaim-on-memcg-limit-reclaim.patch
mm-delete-nr_pages_scanned-and-pgdat_reclaimable.patch
revert-mm-vmscan-account-for-skipped-pages-as-a-partial-scan.patch
mm-remove-unnecessary-back-off-function-when-retrying-page-reclaim.patch
mm-memcontrol-provide-shmem-statistics.patch
mm-page_alloc-__gfp_nowarn-shouldnt-suppress-stall-warnings.patch
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