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[195.135.220.15]) by mx.google.com with ESMTPS id v4si4267250edy.314.2019.02.01.13.02.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 01 Feb 2019 13:02:33 -0800 (PST) Received-SPF: pass (google.com: domain of jack@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 jack@suse.cz designates 195.135.220.15 as permitted sender) smtp.mailfrom=jack@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 E61D1ADF1; Fri, 1 Feb 2019 21:02:32 +0000 (UTC) Received: by quack2.suse.cz (Postfix, from userid 1000) id EA6941E1574; Fri, 1 Feb 2019 22:02:30 +0100 (CET) Date: Fri, 1 Feb 2019 22:02:30 +0100 From: Jan Kara To: Jerome Glisse Cc: Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christian =?iso-8859-1?Q?K=F6nig?= , Jan Kara , Felix Kuehling , Jason Gunthorpe , Matthew Wilcox , Ross Zwisler , Dan Williams , Paolo Bonzini , Radim =?utf-8?B?S3LEjW3DocWZ?= , Michal Hocko , Ralph Campbell , John Hubbard , kvm@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-fsdevel@vger.kernel.org, Arnd Bergmann Subject: Re: [PATCH v4 0/9] mmu notifier provide context informations Message-ID: <20190201210230.GA11643@quack2.suse.cz> References: <20190123222315.1122-1-jglisse@redhat.com> <20190131161006.GA16593@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190131161006.GA16593@redhat.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: On Thu 31-01-19 11:10:06, Jerome Glisse wrote: > > Andrew what is your plan for this ? I had a discussion with Peter Xu > and Andrea about change_pte() and kvm. Today the change_pte() kvm > optimization is effectively disabled because of invalidate_range > calls. With a minimal couple lines patch on top of this patchset > we can bring back the kvm change_pte optimization and we can also > optimize some other cases like for instance when write protecting > after fork (but i am not sure this is something qemu does often so > it might not help for real kvm workload). > > I will be posting a the extra patch as an RFC, but in the meantime > i wanted to know what was the status for this. > > Jan, Christian does your previous ACK still holds for this ? Yes, I still think the approach makes sense. Dan's concern about in tree users is valid but it seems you have those just not merged yet, right? Honza -- Jan Kara SUSE Labs, CR