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| author | David Rientjes <rientjes@google.com> | 2017-02-23 00:46:28 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-23 01:41:30 +0100 |
| commit | 685dbf6f5a643c4bdb9323ee3544ec652505d2ea (patch) | |
| tree | 2d4d5853126589958b4632b71041822478b9ab4f /mm/page_alloc.c | |
| parent | mm: help __GFP_NOFAIL allocations which do not trigger OOM killer (diff) | |
| download | linux-685dbf6f5a643c4bdb9323ee3544ec652505d2ea.tar.xz linux-685dbf6f5a643c4bdb9323ee3544ec652505d2ea.zip | |
mm, page_alloc: warn_alloc nodemask is NULL when cpusets are disabled
The patch "mm, page_alloc: warn_alloc print nodemask" implicitly sets
the allocation nodemask to cpuset_current_mems_allowed when there is no
effective mempolicy. cpuset_current_mems_allowed is only effective when
cpusets are enabled, which is also printed by warn_alloc(), so setting
the nodemask to cpuset_current_mems_allowed is redundant and prevents
debugging issues where ac->nodemask is not set properly in the page
allocator.
This provides better debugging output since
cpuset_print_current_mems_allowed() is already provided.
Link: http://lkml.kernel.org/r/alpine.DEB.2.10.1701181347320.142399@chino.kir.corp.google.com
Signed-off-by: David Rientjes <rientjes@google.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to '')
| -rw-r--r-- | mm/page_alloc.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a179607de26f..c21b33668133 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3034,7 +3034,6 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) va_list args; static DEFINE_RATELIMIT_STATE(nopage_rs, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST); - nodemask_t *nm = (nodemask) ? nodemask : &cpuset_current_mems_allowed; if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs) || debug_guardpage_minorder() > 0) @@ -3048,11 +3047,16 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) pr_cont("%pV", &vaf); va_end(args); - pr_cont(", mode:%#x(%pGg), nodemask=%*pbl\n", gfp_mask, &gfp_mask, nodemask_pr_args(nm)); + pr_cont(", mode:%#x(%pGg), nodemask=", gfp_mask, &gfp_mask); + if (nodemask) + pr_cont("%*pbl\n", nodemask_pr_args(nodemask)); + else + pr_cont("(null)\n"); + cpuset_print_current_mems_allowed(); dump_stack(); - warn_alloc_show_mem(gfp_mask, nm); + warn_alloc_show_mem(gfp_mask, nodemask); } static inline struct page * |