Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933664AbbFJJfH (ORCPT ); Wed, 10 Jun 2015 05:35:07 -0400 Received: from cantor2.suse.de ([195.135.220.15]:41524 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754057AbbFJJdT (ORCPT ); Wed, 10 Jun 2015 05:33:19 -0400 From: Vlastimil Babka To: Andrew Morton , linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, Vlastimil Babka , Minchan Kim , Mel Gorman , Joonsoo Kim , Michal Nazarewicz , Naoya Horiguchi , Christoph Lameter , Rik van Riel , David Rientjes Subject: [PATCH 4/6] mm, compaction: always skip compound pages by order in migrate scanner Date: Wed, 10 Jun 2015 11:32:32 +0200 Message-Id: <1433928754-966-5-git-send-email-vbabka@suse.cz> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1433928754-966-1-git-send-email-vbabka@suse.cz> References: <1433928754-966-1-git-send-email-vbabka@suse.cz> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4425 Lines: 112 The compaction migrate scanner tries to skip compound pages by their order, to reduce number of iterations for pages it cannot isolate. The check is only done if PageLRU() is true, which means it applies to THP pages, but not e.g. hugetlbfs pages or any other non-LRU compound pages, which we have to iterate by base pages. This limitation comes from the assumption that it's only safe to read compound_order() when we have the zone's lru_lock and THP cannot be split under us. But the only danger (after filtering out order values that are not below MAX_ORDER, to prevent overflows) is that we skip too much or too little after reading a bogus compound_order() due to a rare race. This is the same reasoning as patch 99c0fd5e51c4 ("mm, compaction: skip buddy pages by their order in the migrate scanner") introduced for unsafely reading PageBuddy() order. After this patch, all pages are tested for PageCompound() and we skip them by compound_order(). The test is done after the test for balloon_page_movable() as we don't want to assume if balloon pages (or other pages with own isolation and migration implementation if a generic API gets implemented) are compound or not. When tested with stress-highalloc from mmtests on 4GB system with 1GB hugetlbfs pages, the vmstat compact_migrate_scanned count decreased by 15%. Signed-off-by: Vlastimil Babka Cc: Minchan Kim Cc: Mel Gorman Cc: Joonsoo Kim Cc: Michal Nazarewicz Cc: Naoya Horiguchi Cc: Christoph Lameter Cc: Rik van Riel Cc: David Rientjes --- mm/compaction.c | 36 +++++++++++++++++------------------- 1 file changed, 17 insertions(+), 19 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index d334bb3..e37d361 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -680,6 +680,8 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn, /* Time to isolate some pages for migration */ for (; low_pfn < end_pfn; low_pfn++) { + bool is_lru; + /* * Periodically drop the lock (if held) regardless of its * contention, to give chance to IRQs. Abort async compaction @@ -723,39 +725,35 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn, * It's possible to migrate LRU pages and balloon pages * Skip any other type of page */ - if (!PageLRU(page)) { + is_lru = PageLRU(page); + if (!is_lru) { if (unlikely(balloon_page_movable(page))) { if (balloon_page_isolate(page)) { /* Successfully isolated */ goto isolate_success; } } - continue; } /* - * PageLRU is set. lru_lock normally excludes isolation - * splitting and collapsing (collapsing has already happened - * if PageLRU is set) but the lock is not necessarily taken - * here and it is wasteful to take it just to check transhuge. - * Check PageCompound without lock and skip the whole pageblock - * if it's a transhuge page, as calling compound_order() - * without preventing THP from splitting the page underneath us - * may return surprising results. - * If we happen to check a THP tail page, compound_order() - * returns 0. It should be rare enough to not bother with - * using compound_head() in that case. + * Regardless of being on LRU, compound pages such as THP and + * hugetlbfs are not to be compacted. We can potentially save + * a lot of iterations if we skip them at once. The check is + * racy, but we can consider only valid values and the only + * danger is skipping too much. */ if (PageCompound(page)) { - int nr; - if (locked) - nr = 1 << compound_order(page); - else - nr = pageblock_nr_pages; - low_pfn += nr - 1; + unsigned int comp_order = compound_order(page); + + if (comp_order > 0 && comp_order < MAX_ORDER) + low_pfn += (1UL << comp_order) - 1; + continue; } + if (!is_lru) + continue; + /* * Migration will fail if an anonymous page is pinned in memory, * so avoid taking lru_lock and isolating it unnecessarily in an -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/