From 282722b0d258ec23fc79d80165418fee83f01736 Mon Sep 17 00:00:00 2001 From: Vlastimil Babka Date: Mon, 8 May 2017 15:54:49 -0700 Subject: [PATCH] mm, compaction: restrict async compaction to pageblocks of same migratetype The migrate scanner in async compaction is currently limited to MIGRATE_MOVABLE pageblocks. This is a heuristic intended to reduce latency, based on the assumption that non-MOVABLE pageblocks are unlikely to contain movable pages. However, with the exception of THP's, most high-order allocations are not movable. Should the async compaction succeed, this increases the chance that the non-MOVABLE allocations will fallback to a MOVABLE pageblock, making the long-term fragmentation worse. This patch attempts to help the situation by changing async direct compaction so that the migrate scanner only scans the pageblocks of the requested migratetype. If it's a non-MOVABLE type and there are such pageblocks that do contain movable pages, chances are that the allocation can succeed within one of such pageblocks, removing the need for a fallback. If that fails, the subsequent sync attempt will ignore this restriction. In testing based on 4.9 kernel with stress-highalloc from mmtests configured for order-4 GFP_KERNEL allocations, this patch has reduced the number of unmovable allocations falling back to movable pageblocks by 30%. The number of movable allocations falling back is reduced by 12%. Link: http://lkml.kernel.org/r/20170307131545.28577-8-vbabka@suse.cz Signed-off-by: Vlastimil Babka Cc: Mel Gorman Cc: Johannes Weiner Cc: Joonsoo Kim Cc: David Rientjes Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/compaction.c | 11 +++++++++-- mm/page_alloc.c | 20 +++++++++++++------- 2 files changed, 22 insertions(+), 9 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index 365b3c8ae943..206847d35978 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -986,10 +986,17 @@ isolate_migratepages_range(struct compact_control *cc, unsigned long start_pfn, static bool suitable_migration_source(struct compact_control *cc, struct page *page) { - if (cc->mode != MIGRATE_ASYNC) + int block_mt; + + if ((cc->mode != MIGRATE_ASYNC) || !cc->direct_compaction) return true; - return is_migrate_movable(get_pageblock_migratetype(page)); + block_mt = get_pageblock_migratetype(page); + + if (cc->migratetype == MIGRATE_MOVABLE) + return is_migrate_movable(block_mt); + else + return block_mt == cc->migratetype; } /* Returns true if the page is within a block suitable for migration to */ diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d90792addeb9..e7486afa7fa7 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -3665,6 +3665,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, struct alloc_context *ac) { bool can_direct_reclaim = gfp_mask & __GFP_DIRECT_RECLAIM; + const bool costly_order = order > PAGE_ALLOC_COSTLY_ORDER; struct page *page = NULL; unsigned int alloc_flags; unsigned long did_some_progress; @@ -3732,12 +3733,17 @@ retry_cpuset: /* * For costly allocations, try direct compaction first, as it's likely - * that we have enough base pages and don't need to reclaim. Don't try - * that for allocations that are allowed to ignore watermarks, as the - * ALLOC_NO_WATERMARKS attempt didn't yet happen. + * that we have enough base pages and don't need to reclaim. For non- + * movable high-order allocations, do that as well, as compaction will + * try prevent permanent fragmentation by migrating from blocks of the + * same migratetype. + * Don't try this for allocations that are allowed to ignore + * watermarks, as the ALLOC_NO_WATERMARKS attempt didn't yet happen. */ - if (can_direct_reclaim && order > PAGE_ALLOC_COSTLY_ORDER && - !gfp_pfmemalloc_allowed(gfp_mask)) { + if (can_direct_reclaim && + (costly_order || + (order > 0 && ac->migratetype != MIGRATE_MOVABLE)) + && !gfp_pfmemalloc_allowed(gfp_mask)) { page = __alloc_pages_direct_compact(gfp_mask, order, alloc_flags, ac, INIT_COMPACT_PRIORITY, @@ -3749,7 +3755,7 @@ retry_cpuset: * Checks for costly allocations with __GFP_NORETRY, which * includes THP page fault allocations */ - if (gfp_mask & __GFP_NORETRY) { + if (costly_order && (gfp_mask & __GFP_NORETRY)) { /* * If compaction is deferred for high-order allocations, * it is because sync compaction recently failed. If @@ -3830,7 +3836,7 @@ retry: * Do not retry costly high order allocations unless they are * __GFP_REPEAT */ - if (order > PAGE_ALLOC_COSTLY_ORDER && !(gfp_mask & __GFP_REPEAT)) + if (costly_order && !(gfp_mask & __GFP_REPEAT)) goto nopage; if (should_reclaim_retry(gfp_mask, order, ac, alloc_flags,