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Message-Id: <e2f0689e00cce7ac73716da14a971a4f1ab88359.1619618267.git.xuyu@linux.alibaba.com> Date: Wed, 28 Apr 2021 22:00:14 +0800 From: Xu Yu <xuyu@...ux.alibaba.com> To: linux-mm@...ck.org, linux-kernel@...r.kernel.org Cc: akpm@...ux-foundation.org Subject: [PATCH] mm, compaction: avoid isolating pinned tmpfs pages This makes pinned tmpfs pages bail out early in the process of page migration, like what pinned anonymous pages do. Signed-off-by: Xu Yu <xuyu@...ux.alibaba.com> --- mm/compaction.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/mm/compaction.c b/mm/compaction.c index e04f4476e68e..78c3b992a1c9 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -964,11 +964,11 @@ isolate_migratepages_block(struct compact_control *cc, unsigned long low_pfn, } /* - * Migration will fail if an anonymous page is pinned in memory, - * so avoid taking lru_lock and isolating it unnecessarily in an - * admittedly racy check. + * Migration will fail if an anonymous or tmpfs page is pinned + * in memory, so avoid taking lru_lock and isolating it + * unnecessarily in an admittedly racy check. */ - if (!page_mapping(page) && + if (!page_is_file_lru(page) && page_count(page) > page_mapcount(page)) goto isolate_fail; -- 2.20.1.2432.ga663e714
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