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Fri, 30 Oct 2020 11:57:30 -0400 (EDT) From: Zi Yan To: Andrew Morton , linux-mm@kvack.org Cc: Yang Shi , Michal Hocko , Vlastimil Babka , Rik van Riel , linux-kernel@vger.kernel.org, stable@vger.kernel.org, Zi Yan Subject: [PATCH v2 2/2] mm/compaction: stop isolation if too many pages are isolated and we have pages to migrate. Date: Fri, 30 Oct 2020 11:57:16 -0400 Message-Id: <20201030155716.3614401-2-zi.yan@sent.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201030155716.3614401-1-zi.yan@sent.com> References: <20201030155716.3614401-1-zi.yan@sent.com> Reply-To: Zi Yan MIME-Version: 1.0 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Zi Yan In isolate_migratepages_block, if we have too many isolated pages and nr_migratepages is not zero, we should try to migrate what we have without wasting time on isolating. Fixes: 1da2f328fa64 (“mm,thp,compaction,cma: allow THP migration for CMA allocations”) Suggested-by: Vlastimil Babka Signed-off-by: Zi Yan Cc: --- mm/compaction.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/mm/compaction.c b/mm/compaction.c index 3e834ac402f1..4d237a7c3830 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -817,6 +817,10 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn, * delay for some time until fewer pages are isolated */ while (unlikely(too_many_isolated(pgdat))) { + /* stop isolation if there are still pages not migrated */ + if (cc->nr_migratepages) + return 0; + /* async migration should just abort */ if (cc->mode == MIGRATE_ASYNC) return 0;