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[195.135.220.15]) by mx.google.com with ESMTPS id x7si3548205ejb.77.2019.04.12.02.36.43 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 12 Apr 2019 02:36:43 -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 E93DDAA85; Fri, 12 Apr 2019 09:36:42 +0000 (UTC) Date: Fri, 12 Apr 2019 11:36:41 +0200 From: Michal Hocko To: Yafang Shao Cc: Johannes Weiner , Chris Down , Andrew Morton , Cgroups , Linux MM , shaoyafang@didiglobal.com Subject: Re: [PATCH] mm/memcg: add allocstall to memory.stat Message-ID: <20190412093641.GG13373@dhcp22.suse.cz> References: <20190411122659.GW10383@dhcp22.suse.cz> <20190411133300.GX10383@dhcp22.suse.cz> <20190411151039.GY10383@dhcp22.suse.cz> <20190412063417.GA13373@dhcp22.suse.cz> <20190412090929.GE13373@dhcp22.suse.cz> 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=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri 12-04-19 17:29:04, Yafang Shao wrote: > On Fri, Apr 12, 2019 at 5:09 PM Michal Hocko wrote: [...] > > > Then we can do some trace for this memcg, i.e. to trace how long the > > > applicatons may stall via tracepoint. > > > (but current tracepoints can't trace a specified cgroup only, that's > > > another point to be improved.) > > > > It is a task that is stalled, not a cgroup. > > But these tracepoints can't filter a speficied task neither. each trace line output should cotain a pid, no? -- Michal Hocko SUSE Labs