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Commit182f3d7

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Muchun Songtorvalds
Muchun Song
authored andcommitted
mm/page_alloc.c: skip setting nodemask when we are in interrupt
When we are in the interrupt context, it is irrelevant to the current taskcontext. If we use current task's mems_allowed, we can be fair to allocpages in the fast path and fall back to slow path memory allocation whenthe current node(which is the current task mems_allowed) does not haveenough memory to allocate. In this case, it slows down the memoryallocation speed of interrupt context. So we can skip setting thenodemask to allow any node to allocate memory, so that fast pathallocation can success.Signed-off-by: Muchun Song <songmuchun@bytedance.com>Signed-off-by: Andrew Morton <akpm@linux-foundation.org>Reviewed-by: Pekka Enberg <penberg@kernel.org>Cc: David Hildenbrand <david@redhat.com>Link:http://lkml.kernel.org/r/20200706025921.53683-1-songmuchun@bytedance.comSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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‎mm/page_alloc.c‎

Lines changed: 5 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4788,7 +4788,11 @@ static inline bool prepare_alloc_pages(gfp_t gfp_mask, unsigned int order,
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if (cpusets_enabled()) {
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*alloc_mask |=__GFP_HARDWALL;
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if (!ac->nodemask)
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/*
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* When we are in the interrupt context, it is irrelevant
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* to the current task context. It means that any node ok.
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*/
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if (!in_interrupt()&& !ac->nodemask)
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ac->nodemask=&cpuset_current_mems_allowed;
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else
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*alloc_flags |=ALLOC_CPUSET;

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