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[195.135.220.15]) by mx.google.com with ESMTPS id p32si7659175eda.51.2019.06.17.06.51.34 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Jun 2019 06:51:35 -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 802D3AF30; Mon, 17 Jun 2019 13:51:34 +0000 (UTC) Subject: Re: [PATCH 1/1] mm/page_owner: store page_owner's gfp_mask in stackdepot itself To: Sai Charan Sane , akpm@linux-foundation.org, mhocko@suse.com, tglx@linutronix.de, rppt@linux.vnet.ibm.com, gregkh@linuxfoundation.org, joe@perches.com, miles.chen@mediatek.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, a.sahrawat@samsung.com, pankaj.m@samsung.com, v.narang@samsung.com References: <1559886798-29585-1-git-send-email-s.charan@samsung.com> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <1559886798-29585-1-git-send-email-s.charan@samsung.com> 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 6/7/19 7:53 AM, Sai Charan Sane wrote: > Memory overhead of 4MB is reduced by storing gfp_mask in stackdepot along > with stacktrace. Stackdepot memory usage increased by ~100kb for 4GB of RAM. > > Page owner logs from dmesg: > Before patch: > allocated 20971520 bytes of page_ext > After patch: > allocated 16777216 bytes of page_ext > > Signed-off-by: Sai Charan Sane I don't know, this looks like unneeded abuse to me. In the debug scenario when someone boots a kernel with page_owner enabled, does 4MB out of 4GB RAM really make a difference?