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mm: migrate: Drop the misplaced pages reference count if the target node is full
If we have to avoid migrating to a node that is nearly full, put page and return zero. Signed-off-by: Hillf Danton <dhillf@gmail.com> Signed-off-by: Mel Gorman <mgorman@suse.de>
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1 changed files with 10 additions and 7 deletions
17
mm/migrate.c
17
mm/migrate.c
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@ -1489,18 +1489,21 @@ int migrate_misplaced_page(struct page *page, int node)
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}
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isolated = 1;
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/*
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* Page is isolated which takes a reference count so now the
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* callers reference can be safely dropped without the page
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* disappearing underneath us during migration
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*/
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put_page(page);
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page_lru = page_is_file_cache(page);
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inc_zone_page_state(page, NR_ISOLATED_ANON + page_lru);
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list_add(&page->lru, &migratepages);
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}
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/*
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* Page is either isolated or there is not enough space on the target
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* node. If isolated, then it has taken a reference count and the
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* callers reference can be safely dropped without the page
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* disappearing underneath us during migration. Otherwise the page is
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* not to be migrated but the callers reference should still be
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* dropped so it does not leak.
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*/
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put_page(page);
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if (isolated) {
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int nr_remaining;
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