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=-2.3 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 AF4C4C35280 for ; Wed, 2 Oct 2019 15:05:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 790BB2133F for ; Wed, 2 Oct 2019 15:05:10 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 790BB2133F Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id F16396B0007; Wed, 2 Oct 2019 11:05:09 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EC53C6B0008; 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Wed, 2 Oct 2019 15:05:06 +0000 (UTC) Received: from [10.40.204.213] (ovpn-204-213.brq.redhat.com [10.40.204.213]) by smtp.corp.redhat.com (Postfix) with ESMTPS id BFA28608C2; Wed, 2 Oct 2019 15:04:47 +0000 (UTC) Subject: Re: [PATCH v11 0/6] mm / virtio: Provide support for unused page reporting To: Dave Hansen , Alexander Duyck , David Hildenbrand , Alexander Duyck , virtio-dev@lists.oasis-open.org, kvm@vger.kernel.org, mst@redhat.com, linux-kernel@vger.kernel.org, willy@infradead.org, mhocko@kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, mgorman@techsingularity.net, vbabka@suse.cz, osalvador@suse.de Cc: yang.zhang.wz@gmail.com, pagupta@redhat.com, konrad.wilk@oracle.com, riel@surriel.com, lcapitulino@redhat.com, wei.w.wang@intel.com, aarcange@redhat.com, pbonzini@redhat.com, dan.j.williams@intel.com References: <20191001152441.27008.99285.stgit@localhost.localdomain> <7233498c-2f64-d661-4981-707b59c78fd5@redhat.com> <1ea1a4e11617291062db81f65745b9c95fd0bb30.camel@linux.intel.com> <8bd303a6-6e50-b2dc-19ab-4c3f176c4b02@redhat.com> <150e09b3-42c0-567e-55b8-7be6b45fd576@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: <150e09b3-42c0-567e-55b8-7be6b45fd576@intel.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.27]); Wed, 02 Oct 2019 15:05:07 +0000 (UTC) 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 10/1/19 4:51 PM, Dave Hansen wrote: > On 10/1/19 1:49 PM, Alexander Duyck wrote: >> So it looks like v12 still has issues. I'm pretty sure you should be u= sing >> spin_lock_irq(), not spin_lock() in page_reporting.c to avoid the >> possibility of an IRQ firing and causing lock recursion on the zone lo= ck. > Lockdep should make all of this a lot easier to find. Is it being used= ? I do have it in the function which returns the pages to the buddy but I m= issed it in the function that isolates the pages. I will correct this. --=20 Thanks Nitesh