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Wed, 23 Oct 2019 11:19:21 +0000 (UTC) Received: from [10.18.17.163] (dhcp-17-163.bos.redhat.com [10.18.17.163]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 3A5AC60C5D; Wed, 23 Oct 2019 11:19:09 +0000 (UTC) Subject: Re: [PATCH v12 0/6] mm / virtio: Provide support for unused page reporting To: Alexander Duyck , Andrew Morton , Alexander Duyck , david@redhat.com Cc: kvm@vger.kernel.org, mst@redhat.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, mgorman@techsingularity.net, vbabka@suse.cz, yang.zhang.wz@gmail.com, konrad.wilk@oracle.com, pagupta@redhat.com, riel@surriel.com, lcapitulino@redhat.com, dave.hansen@intel.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com, osalvador@suse.de References: <20191022221223.17338.5860.stgit@localhost.localdomain> <20191022160140.a6954868d59f47b36334b504@linux-foundation.org> <03b350f7de4b8f75cc3579e6c43f36aa09fd16b2.camel@linux.intel.com> From: Nitesh Narayan Lal Openpgp: preference=signencrypt Autocrypt: addr=nitesh@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <03b350f7de4b8f75cc3579e6c43f36aa09fd16b2.camel@linux.intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: sJN9wUWPPW-BUW6mLOrjNA-1 X-Mimecast-Spam-Score: 0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/22/19 7:43 PM, Alexander Duyck wrote: > On Tue, 2019-10-22 at 16:01 -0700, Andrew Morton wrote: >> On Tue, 22 Oct 2019 15:27:52 -0700 Alexander Duyck wrote: >> [...] >>> There is currently an alternative patch set[1] that has been under work >>> for some time however the v12 version of that patch set could not be >>> tested as it triggered a kernel panic when I attempted to test it. It >>> requires multiple modifications to get up and running with performance >>> comparable to this patch set. A follow-on set has yet to be posted. As >>> such I have not included results from that patch set, and I would >>> appreciate it if we could keep this patch set the focus of any discussi= on >>> on this thread. >> Actually, the rest of us would be interested in a comparison ;) =20 > I understand that. However, the last time I tried benchmarking that patch > set it blew up into a thread where we kept having to fix things on that > patch set and by the time we were done we weren't benchmarking the v12 > patch set anymore since we had made so many modifications to it, and that= =20 > assumes Nitesh and I were in sync. Also I don't know what the current > state of his patch set is as he was working on some additional changes > when we last discussed things. Just an update about the current state of my patch-series: As we last discussed I was going to try implementing Michal Hock's suggesti= on of using page-isolation APIs. To do that I have replaced __isolate_free_page()= with start/undo_isolate_free_page_range(). However, I am running into some issues which I am currently investigating. After this, I will be investigating the reason why I was seeing degradation specifically with (MAX_ORDER - 2) as the reporting order. > > Ideally that patch set can be reposted with the necessary fixes and then > we can go through any necessary debug, repair, and addressing limitations > there. > >