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Mon, 15 Mar 2021 16:12:41 +0000 (UTC) Subject: Re: [PATCH] kswapd: no need reclaim cma pages triggered by unmovable allocation To: Michal Hocko Cc: zhou , linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, mgorman@suse.de, willy@linux.intel.com, rostedt@goodmis.org, mingo@redhat.com, vbabka@suse.cz, rientjes@google.com, pankaj.gupta.linux@gmail.com, bhe@redhat.com, ying.huang@intel.com, iamjoonsoo.kim@lge.com, minchan@kernel.org, ruxian.feng@transsion.com, kai.cheng@transsion.com, zhao.xu@transsion.com, zhouxianrong@tom.com, zhou xianrong References: <20210313083109.5410-1-xianrong_zhou@163.com> <64f8c03f-7fd9-2e03-6b90-67e2a5a45b9d@redhat.com> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: Date: Mon, 15 Mar 2021 17:12:40 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-Stat-Signature: i5zasg65gb4s53zcnduhdknjiomemhak X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 80C2F4140174 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf10; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=63.128.21.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1615824775-51246 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: On 15.03.21 17:09, Michal Hocko wrote: > On Mon 15-03-21 16:46:33, David Hildenbrand wrote: >> On 13.03.21 09:31, zhou wrote: > [...] >>> This optimization can avoid ~3% unnecessary isolations from cma >>> (cma isolated / total isolated) with configuration of total 100Mb >>> cma pages. >> >> Can you say a few words about interaction with ZONE_MOVABLE, which behaves >> similar to CMA? I.e., does the same apply to ZONE_MOVABLE? Is it already >> handled? > > No, the movable zone shouldn't be affected as the reclaim is zone aware. > The problem is that CMA doesn't belong to any particular zone. This is > something Joonsoo worked in the past and I believe following up on that > work has been recommended last time a similar/same approach like this > patch was proposed. Okay, thanks - that's what I expected. -- Thanks, David / dhildenb