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[195.135.220.15]) by mx.google.com with ESMTPS id g8si350596edh.103.2019.03.26.02.01.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Mar 2019 02:01:44 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 75AA9AD65; Tue, 26 Mar 2019 09:01:43 +0000 (UTC) Date: Tue, 26 Mar 2019 10:01:42 +0100 From: Michal Hocko To: Pankaj Suryawanshi Cc: Kirill Tkhai , Vlastimil Babka , "aneesh.kumar@linux.ibm.com" , "linux-kernel@vger.kernel.org" , "minchan@kernel.org" , "linux-mm@kvack.org" , "khandual@linux.vnet.ibm.com" Subject: Re: [External] Re: vmscan: Reclaim unevictable pages Message-ID: <20190326090142.GH28406@dhcp22.suse.cz> References: <0b86dbca-cbc9-3b43-e3b9-8876bcc24f22@suse.cz> <56862fc0-3e4b-8d1e-ae15-0df32bf5e4c0@virtuozzo.com> <4c05dda3-9fdf-e357-75ed-6ee3f25c9e52@virtuozzo.com> <09b6ee71-0007-7f1d-ac80-7e05421e4ec6@virtuozzo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) 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: [You were asked to use a reasonable quoting several times. This is really annoying because it turns the email thread into a complete mess] On Tue 26-03-19 07:53:14, Pankaj Suryawanshi wrote: > Is there anyone who is familiar with this? Please Comment. Not really. You are observing an unexpected behavior of the page reclaim which hasn't changed for quite some time. So I find more probable that your non-vanilla kernel is doing something unexpected. It would help if you could track down how does the unevictable page get down to the reclaim path. I assume this is a CMA page or something like that but those shouldn't get to the reclaim path AFIR. -- Michal Hocko SUSE Labs