From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 160FAC2D0EA for ; Thu, 9 Apr 2020 07:21:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C7D6920753 for ; Thu, 9 Apr 2020 07:21:07 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C7D6920753 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=i-love.sakura.ne.jp Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 742F68E000E; Thu, 9 Apr 2020 03:21:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6F3338E0006; Thu, 9 Apr 2020 03:21:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5E1EF8E000E; Thu, 9 Apr 2020 03:21:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0005.hostedemail.com [216.40.44.5]) by kanga.kvack.org (Postfix) with ESMTP id 4F8EE8E0006 for ; Thu, 9 Apr 2020 03:21:07 -0400 (EDT) Received: from smtpin04.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 20C4B4857 for ; Thu, 9 Apr 2020 07:21:07 +0000 (UTC) X-FDA: 76687470174.04.drink35_7e1221e7b9e62 X-HE-Tag: drink35_7e1221e7b9e62 X-Filterd-Recvd-Size: 2679 Received: from www262.sakura.ne.jp (www262.sakura.ne.jp [202.181.97.72]) by imf13.hostedemail.com (Postfix) with ESMTP for ; Thu, 9 Apr 2020 07:21:06 +0000 (UTC) Received: from fsav404.sakura.ne.jp (fsav404.sakura.ne.jp [133.242.250.103]) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTP id 0397Kb2Y070235; Thu, 9 Apr 2020 16:20:37 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Received: from www262.sakura.ne.jp (202.181.97.72) by fsav404.sakura.ne.jp (F-Secure/fsigk_smtp/550/fsav404.sakura.ne.jp); Thu, 09 Apr 2020 16:20:37 +0900 (JST) X-Virus-Status: clean(F-Secure/fsigk_smtp/550/fsav404.sakura.ne.jp) Received: from [192.168.1.9] (M106072142033.v4.enabler.ne.jp [106.72.142.33]) (authenticated bits=0) by www262.sakura.ne.jp (8.15.2/8.15.2) with ESMTPSA id 0397KE9X069755 (version=TLSv1.2 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Thu, 9 Apr 2020 16:20:14 +0900 (JST) (envelope-from penguin-kernel@i-love.sakura.ne.jp) Subject: Re: [patch 043/155] mm/gup: track FOLL_PIN pages To: John Hubbard Cc: imbrenda@linux.ibm.com, jack@suse.cz, jglisse@redhat.com, Andrew Morton , corbet@lwn.net, dan.j.williams@intel.com, david@fromorbit.com, hch@infradead.org, ira.weiny@intel.com, jgg@ziepe.ca, kirill.shutemov@linux.intel.com, linux-mm@kvack.org, mhocko@suse.com, mike.kravetz@oracle.com, shuah@kernel.org, torvalds@linux-foundation.org, vbabka@suse.cz, viro@zeniv.linux.org.uk, willy@infradead.org References: <20200402040529.wHKICHtvB%akpm@linux-foundation.org> <2d45b8b7-ecbc-298f-5124-cb635dd3928a@nvidia.com> From: Tetsuo Handa Message-ID: <8bde6675-6cd4-c25e-059a-beeb54c6b0c1@i-love.sakura.ne.jp> Date: Thu, 9 Apr 2020 16:20:10 +0900 User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <2d45b8b7-ecbc-298f-5124-cb635dd3928a@nvidia.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: Hello. On 2020/04/09 15:38, John Hubbard wrote: > Also, if you happen to know if anything is calling pin_user_page*() and/or unpin_user_page*(), that > is extra credit. :) Ah, I got it. I can see that only nr_foll_pin_released is increasing after I hit WARN_ON(), and indeed AKARI is calling unpin_user_page() when put_user() should be used. https://osdn.net/projects/akari/scm/svn/blobs/head/trunk/akari/permission.c line 1480 Sorry for the noise. Thank you.