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[2603:7000:c01:2716:3012:16a2:6bc2:2937]) by smtp.gmail.com with ESMTPSA id h8-20020a05620a10a800b0076dae4753efsm4050120qkk.14.2023.09.13.10.38.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 13 Sep 2023 10:38:03 -0700 (PDT) Date: Wed, 13 Sep 2023 13:38:02 -0400 From: Johannes Weiner To: Vern Hao Cc: mhocko@kernel.org, roman.gushchin@linux.dev, shakeelb@google.com, akpm@linux-foundation.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Xin Hao Subject: Re: [PATCH v3] mm: memcg: add THP swap out info for anonymous reclaim Message-ID: <20230913173802.GA48476@cmpxchg.org> References: <20230913164938.16918-1-vernhao@tencent.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230913164938.16918-1-vernhao@tencent.com> X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: D5BE514001B X-Stat-Signature: b68dsbrj83n9rrih56fuuwnrt1myrm6r X-Rspam-User: X-HE-Tag: 1694626684-659488 X-HE-Meta: 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 221i08Vb 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.001975, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Sep 14, 2023 at 12:49:37AM +0800, Vern Hao wrote: > From: Xin Hao > > At present, we support per-memcg reclaim strategy, however we do not > know the number of transparent huge pages being reclaimed, as we know > the transparent huge pages need to be splited before reclaim them, and > they will bring some performance bottleneck effect. for example, when > two memcg (A & B) are doing reclaim for anonymous pages at same time, > and 'A' memcg is reclaiming a large number of transparent huge pages, we > can better analyze that the performance bottleneck will be caused by 'A' > memcg. therefore, in order to better analyze such problems, there add > THP swap out info for per-memcg. > > Suggested-by: Johannes Weiner > Signed-off-by: Xin Hao Acked-by: Johannes Weiner