mm, slub: do initial checks in ___slab_alloc() with irqs enabled

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As another step of shortening irq disabled sections in ___slab_alloc(), delay
disabling irqs until we pass the initial checks if there is a cached percpu
slab and it's suitable for our allocation.

Now we have to recheck c->page after actually disabling irqs as an allocation
in irq handler might have replaced it.

Because we call pfmemalloc_match() as one of the checks, we might hit
VM_BUG_ON_PAGE(!PageSlab(page)) in PageSlabPfmemalloc in case we get
interrupted and the page is freed. Thus introduce a pfmemalloc_match_unsafe()
variant that lacks the PageSlab check.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Mel Gorman <mgorman@techsingularity.net>

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This commit is contained in:

Vlastimil Babka 2021-05-08 02:28:02 +02:00

parent e500059ba5

commit 0b303fb402

2 changed files with 54 additions and 9 deletions

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9

include/linux/page-flags.h

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54

mm/slub.c

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