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[195.135.220.15]) by mx.google.com with ESMTPS id p15si6969543eju.348.2019.07.24.01.19.35 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 24 Jul 2019 01:19:35 -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 86B9DAD8A; Wed, 24 Jul 2019 08:19:34 +0000 (UTC) Subject: Re: [v4 PATCH 2/2] mm: mempolicy: handle vma with unmovable pages mapped correctly in mbind To: Yang Shi , Andrew Morton Cc: mhocko@kernel.org, mgorman@techsingularity.net, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-api@vger.kernel.org References: <1563556862-54056-1-git-send-email-yang.shi@linux.alibaba.com> <1563556862-54056-3-git-send-email-yang.shi@linux.alibaba.com> <6c948a96-7af1-c0d2-b3df-5fe613284d4f@suse.cz> <20190722180231.b7abbe8bdb046d725bdd9e6b@linux-foundation.org> From: Vlastimil Babka Openpgp: preference=signencrypt Autocrypt: addr=vbabka@suse.cz; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 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 7/23/19 7:35 AM, Yang Shi wrote: > > > On 7/22/19 6:02 PM, Andrew Morton wrote: >> On Mon, 22 Jul 2019 09:25:09 +0200 Vlastimil Babka wrote: >> >>>> since there may be pages off LRU temporarily. We should migrate other >>>> pages if MPOL_MF_MOVE* is specified. Set has_unmovable flag if some >>>> paged could not be not moved, then return -EIO for mbind() eventually. >>>> >>>> With this change the above test would return -EIO as expected. >>>> >>>> Cc: Vlastimil Babka >>>> Cc: Michal Hocko >>>> Cc: Mel Gorman >>>> Signed-off-by: Yang Shi >>> Reviewed-by: Vlastimil Babka >> Thanks. >> >> I'm a bit surprised that this doesn't have a cc:stable. Did we >> consider that? > > The VM_BUG just happens on 4.9, and it is enabled only by CONFIG_VM. For > post-4.9 kernel, this fixes the semantics of mbind which should be not a > regression IMHO. 4.9 is a LTS kernel, so perhaps worth trying? >> >> Also, is this patch dependent upon "mm: mempolicy: make the behavior >> consistent when MPOL_MF_MOVE* and MPOL_MF_STRICT were specified"? >> Doesn't look that way.. > > No, it depends on patch #1. > >> >> Also, I have a note that you had concerns with "mm: mempolicy: make the >> behavior consistent when MPOL_MF_MOVE* and MPOL_MF_STRICT were >> specified". What is the status now? > > Vlastimil had given his Reviewed-by. Yes, the concerns were resolved.