mm, sl[au]b: add __GFP_ATOMIC to the GFP reclaim mask
Commit d0164adc89
("mm, page_alloc: distinguish between being unable to
sleep, unwilling to sleep and avoiding waking kswapd") modified __GFP_WAIT
to explicitly identify the difference between atomic callers and those
that were unwilling to sleep. Later the definition was removed entirely.
The GFP_RECLAIM_MASK is the set of flags that affect watermark checking
and reclaim behaviour but __GFP_ATOMIC was never added. Without it, atomic
users of the slab allocator strip the __GFP_ATOMIC flag and cannot access
the page allocator atomic reserves. This patch addresses the problem.
The user-visible impact depends on the workload but potentially atomic
allocations unnecessarily fail without this path.
Change-Id: Ieac0932d146f7fd992db9fd834b0e9aa3822f891
Link: http://lkml.kernel.org/r/20160610093832.GK2527@techsingularity.net
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Reported-by: Marcin Wojtas <mw@semihalf.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: <stable@vger.kernel.org> [4.4+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Git-Commit: 843f65ccbb2273430b57ae135ccd26dddee05be7
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
This commit is contained in:
parent
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1 changed files with 2 additions and 1 deletions
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*/
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#define GFP_RECLAIM_MASK (__GFP_RECLAIM|__GFP_HIGH|__GFP_IO|__GFP_FS|\
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__GFP_NOWARN|__GFP_REPEAT|__GFP_NOFAIL|\
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__GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC)
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__GFP_NORETRY|__GFP_MEMALLOC|__GFP_NOMEMALLOC|\
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__GFP_ATOMIC)
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/* The GFP flags allowed during early boot */
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#define GFP_BOOT_MASK (__GFP_BITS_MASK & ~(__GFP_RECLAIM|__GFP_IO|__GFP_FS))
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