mm, page_alloc: only enforce watermarks for order-0 allocations (97a16fc8) · Commits · 戴 / test

The primary purpose of watermarks is to ensure that reclaim can always make forward progress in PF_MEMALLOC context (kswapd and direct reclaim). These assume that order-0 allocations are all that is necessary for forward progress. High-order watermarks serve a different purpose. Kswapd had no high-order awareness before they were introduced (https://lkml.kernel.org/r/413AA7B2.4000907@yahoo.com.au ). This was particularly important when there were high-order atomic requests. The watermarks both gave kswapd awareness and made a reserve for those atomic requests. There are two important side-effects of this. The most important is that a non-atomic high-order request can fail even though free pages are available and the order-0 watermarks are ok. The second is that high-order watermark checks are expensive as the free list counts up to the requested order must be examined. With the introduction of MIGRATE_HIGHATOMIC it is no longer necessary to have high-order watermarks. Kswapd and compaction still need high-order awareness which is handled by checking that at least one suitable high-order page is free. With the patch applied, there was little difference in the allocation failure rates as the atomic reserves are small relative to the number of allocation attempts. The expected impact is that there will never be an allocation failure report that shows suitable pages on the free lists. The one potential side-effect of this is that in a vanilla kernel, the watermark checks may have kept a free page for an atomic allocation. Now, we are 100% relying on the HighAtomic reserves and an early allocation to have allocated them. If the first high-order atomic allocation is after the system is already heavily fragmented then it'll fail. [akpm@linux-foundation.org: simplify __zone_watermark_ok(), per Vlastimil] Signed-off-by:

Mel Gorman <mgorman@techsingularity.net> Acked-by:

Michal Hocko <mhocko@suse.com> Acked-by:

Johannes Weiner <hannes@cmpxchg.org> Acked-by:

Vlastimil Babka <vbabka@suse.cz> Cc: Christoph Lameter <cl@linux.com> Cc: David Rientjes <rientjes@google.com> Cc: Vitaly Wool <vitalywool@gmail.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by:

Andrew Morton <akpm@linux-foundation.org> Signed-off-by:

Linus Torvalds <torvalds@linux-foundation.org>

mm/page_alloc.c

+39 −14

Original line number	Diff line number	Diff line
		@@ -2322,8 +2322,10 @@ static inline bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
		#endif /* CONFIG_FAIL_PAGE_ALLOC */

		/*
		* Return true if free pages are above 'mark'. This takes into account the order
		* of the allocation.
		* Return true if free base pages are above 'mark'. For high-order checks it
		* will return true of the order-0 watermark is reached and there is at least
		* one free page of a suitable size. Checking now avoids taking the zone lock
		* to check in the allocation paths if no pages are free.
		*/
		static bool __zone_watermark_ok(struct zone *z, unsigned int order,
		unsigned long mark, int classzone_idx, int alloc_flags,
		@@ -2331,7 +2333,7 @@ static bool __zone_watermark_ok(struct zone *z, unsigned int order,
		{
		long min = mark;
		int o;
		long free_cma = 0;
		const int alloc_harder = (alloc_flags & ALLOC_HARDER);

		/* free_pages may go negative - that's OK */
		free_pages -= (1 << order) - 1;
		@@ -2344,7 +2346,7 @@ static bool __zone_watermark_ok(struct zone *z, unsigned int order,
		* the high-atomic reserves. This will over-estimate the size of the
		* atomic reserve but it avoids a search.
		*/
		if (likely(!(alloc_flags & ALLOC_HARDER)))
		if (likely(!alloc_harder))
		free_pages -= z->nr_reserved_highatomic;
		else
		min -= min / 4;
		@@ -2352,23 +2354,46 @@ static bool __zone_watermark_ok(struct zone *z, unsigned int order,
		#ifdef CONFIG_CMA
		/* If allocation can't use CMA areas don't use free CMA pages */
		if (!(alloc_flags & ALLOC_CMA))
		free_cma = zone_page_state(z, NR_FREE_CMA_PAGES);
		free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES);
		#endif

		if (free_pages - free_cma <= min + z->lowmem_reserve[classzone_idx])
		/*
		* Check watermarks for an order-0 allocation request. If these
		* are not met, then a high-order request also cannot go ahead
		* even if a suitable page happened to be free.
		*/
		if (free_pages <= min + z->lowmem_reserve[classzone_idx])
		return false;
		for (o = 0; o < order; o++) {
		/* At the next order, this order's pages become unavailable */
		free_pages -= z->free_area[o].nr_free << o;

		/* Require fewer higher order pages to be free */
		min >>= 1;
		/* If this is an order-0 request then the watermark is fine */
		if (!order)
		return true;

		if (free_pages <= min)
		return false;
		/* For a high-order request, check at least one suitable page is free */
		for (o = order; o < MAX_ORDER; o++) {
		struct free_area *area = &z->free_area[o];
		int mt;

		if (!area->nr_free)
		continue;

		if (alloc_harder)
		return true;

		for (mt = 0; mt < MIGRATE_PCPTYPES; mt++) {
		if (!list_empty(&area->free_list[mt]))
		return true;
		}

		#ifdef CONFIG_CMA
		if ((alloc_flags & ALLOC_CMA) &&
		!list_empty(&area->free_list[MIGRATE_CMA])) {
		return true;
		}
		#endif
		}
		return false;
		}

		bool zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark,
		int classzone_idx, int alloc_flags)

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