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Wed, 04 Sep 2019 16:53:22 +0300 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client certificate not present) Subject: [PATCH v1 7/7] mm/mlock: recharge mlocked pages at culling by vmscan From: Konstantin Khlebnikov To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org Cc: Michal Hocko , Roman Gushchin , Johannes Weiner Date: Wed, 04 Sep 2019 16:53:22 +0300 Message-ID: <156760520240.6560.4933207338618527335.stgit@buzz> In-Reply-To: <156760509382.6560.17364256340940314860.stgit@buzz> References: <156760509382.6560.17364256340940314860.stgit@buzz> User-Agent: StGit/0.17.1-dirty 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: If mlock cannot catch page in LRU then it isn't moved into unevictable lru. These pages are 'culled' by reclaimer and moved into unevictable lru. It seems pages locked with MLOCK_ONFAULT always go through this path. Reclaimer calls try_to_unmap for already isolated pages, thus on this path we could freely change page to owner of any mlock vma we found in rmap. This patch passes flag TTU_LRU_ISOLATED into try_to_ummap to move pages in mmlock_vma_page(). Signed-off-by: Konstantin Khlebnikov --- mm/vmscan.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index bf7a05e8a717..2060f254dd6b 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1345,7 +1345,8 @@ static unsigned long shrink_page_list(struct list_head *page_list, * processes. Try to unmap it here. */ if (page_mapped(page)) { - enum ttu_flags flags = ttu_flags | TTU_BATCH_FLUSH; + enum ttu_flags flags = ttu_flags | TTU_BATCH_FLUSH | + TTU_LRU_ISOLATED; if (unlikely(PageTransHuge(page))) flags |= TTU_SPLIT_HUGE_PMD;