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[195.135.220.15]) by mx.google.com with ESMTPS id f34si2968313edf.38.2019.05.06.02.05.27 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 06 May 2019 02:05:27 -0700 (PDT) Received-SPF: pass (google.com: domain of vbabka@suse.cz 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 vbabka@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=vbabka@suse.cz 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 4282DAC5A; Mon, 6 May 2019 09:05:27 +0000 (UTC) Subject: Re: Page Allocation Failure and Page allocation stalls To: Pankaj Suryawanshi , =?UTF-8?Q?Valdis_Kl=c4=93tnieks?= Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, kernelnewbies@kernelnewbies.org, Michal Hocko , minchan@kernel.org References: <11029.1556774479@turing-police> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit 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 5/3/19 7:44 PM, Pankaj Suryawanshi wrote: >> First possibility that comes to mind is that a usermodehelper got launched, and >> it then tried to fork with a very large active process image. Do we have any >> clues what was going on? Did a device get hotplugged? > > Yes,The system is android and it tries to allocate memory for video > player from CMA reserved memory using custom octl call for dma apis. The stacktrace doesn't look like a CMA allocation though. That would be doing alloc_contig_range(), not kmalloc(). Could be some CMA area setup issue? > Please let me know how to overcome this issues, or how to reduce > fragmentation of memory so that higher order allocation get suuceed ? > > Thanks >