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mm: only set page->pfmemalloc when ALLOC_NO_WATERMARKS was used
__alloc_pages_slowpath() is called when the number of free pages is below the low watermark. If the caller is entitled to use ALLOC_NO_WATERMARKS then the page will be marked page->pfmemalloc. This protects more pages than are strictly necessary as we only need to protect pages allocated below the min watermark (the pfmemalloc reserves). This patch only sets page->pfmemalloc when ALLOC_NO_WATERMARKS was required to allocate the page. [rientjes@google.com: David noticed the problem during review] Signed-off-by: Mel Gorman <mgorman@suse.de> Cc: David Miller <davem@davemloft.net> Cc: Neil Brown <neilb@suse.de> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Christie <michaelc@cs.wisc.edu> Cc: Eric B Munson <emunson@mgebm.net> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc> Cc: Mel Gorman <mgorman@suse.de> Cc: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -2116,8 +2116,8 @@ __alloc_pages_direct_compact(gfp_t gfp_mask, unsigned int order,
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page = get_page_from_freelist(gfp_mask, nodemask,
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order, zonelist, high_zoneidx,
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alloc_flags, preferred_zone,
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migratetype);
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alloc_flags & ~ALLOC_NO_WATERMARKS,
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preferred_zone, migratetype);
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if (page) {
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preferred_zone->compact_considered = 0;
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preferred_zone->compact_defer_shift = 0;
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@ -2209,8 +2209,8 @@ __alloc_pages_direct_reclaim(gfp_t gfp_mask, unsigned int order,
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retry:
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page = get_page_from_freelist(gfp_mask, nodemask, order,
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zonelist, high_zoneidx,
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alloc_flags, preferred_zone,
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migratetype);
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alloc_flags & ~ALLOC_NO_WATERMARKS,
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preferred_zone, migratetype);
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/*
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* If an allocation failed after direct reclaim, it could be because
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@ -2381,8 +2381,17 @@ rebalance:
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page = __alloc_pages_high_priority(gfp_mask, order,
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zonelist, high_zoneidx, nodemask,
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preferred_zone, migratetype);
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if (page)
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if (page) {
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/*
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* page->pfmemalloc is set when ALLOC_NO_WATERMARKS was
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* necessary to allocate the page. The expectation is
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* that the caller is taking steps that will free more
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* memory. The caller should avoid the page being used
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* for !PFMEMALLOC purposes.
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*/
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page->pfmemalloc = true;
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goto got_pg;
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}
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}
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/* Atomic allocations - we can't balance anything */
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@ -2499,14 +2508,6 @@ nopage:
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warn_alloc_failed(gfp_mask, order, NULL);
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return page;
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got_pg:
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/*
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* page->pfmemalloc is set when the caller had PFMEMALLOC set, is
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* been OOM killed or specified __GFP_MEMALLOC. The expectation is
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* that the caller is taking steps that will free more memory. The
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* caller should avoid the page being used for !PFMEMALLOC purposes.
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*/
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page->pfmemalloc = !!(alloc_flags & ALLOC_NO_WATERMARKS);
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if (kmemcheck_enabled)
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kmemcheck_pagealloc_alloc(page, order, gfp_mask);
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