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[195.135.220.15]) by mx.google.com with ESMTPS id a17si1503374ejj.110.2019.03.07.00.09.42 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 Mar 2019 00:09:42 -0800 (PST) Received-SPF: pass (google.com: domain of mhocko@suse.com designates 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=pass (google.com: domain of mhocko@suse.com designates 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@suse.com 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 1D956B137; Thu, 7 Mar 2019 08:09:42 +0000 (UTC) Date: Thu, 7 Mar 2019 09:09:40 +0100 From: Michal Hocko To: Pankaj Suryawanshi Cc: s.szyprowski@samsung.com, mina86@mina86.com, linux-mm@kvack.org, LKML Subject: Re: CMA allocation failure and Latency issue Message-ID: <20190307080940.GL4603@dhcp22.suse.cz> References: <22ed9e4c-962b-4e8c-8549-d8cca578957f@email.android.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <22ed9e4c-962b-4e8c-8549-d8cca578957f@email.android.com> 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: [Cc linux-mm and lkml] Please do not use html emails, thanks! On Thu 07-03-19 13:28:59, Pankaj Suryawanshi wrote: > Hello, > > I am facing issue related to CMA allocation failure of large size buffer. > > I am beginner in Linux memory management. So I need your help to debug the > issue, > > I have below questions > > 1. Why migration failed > 2. Who pinned the pages, Which process pinned ,how to know ? > 3. How to migrate pages forcefully so failure will avoid.(not preferable > approach) > etc. > > Any help would be appreciated. > > Please let me know if you require further information. > > Regards, > Pankaj -- Michal Hocko SUSE Labs