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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 9EC6DC00454 for ; Thu, 12 Dec 2019 23:47:22 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 4EDA221655 for ; Thu, 12 Dec 2019 23:47:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4EDA221655 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 944C38E0005; Thu, 12 Dec 2019 18:47:21 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 8F5868E0001; Thu, 12 Dec 2019 18:47:21 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 80CBC8E0005; Thu, 12 Dec 2019 18:47:21 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0007.hostedemail.com [216.40.44.7]) by kanga.kvack.org (Postfix) with ESMTP id 6C3008E0001 for ; Thu, 12 Dec 2019 18:47:21 -0500 (EST) Received: from smtpin22.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with SMTP id 1FA16181AEF00 for ; Thu, 12 Dec 2019 23:47:21 +0000 (UTC) X-FDA: 76258128282.22.sheep58_4019d45937e13 X-HE-Tag: sheep58_4019d45937e13 X-Filterd-Recvd-Size: 3787 Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by imf41.hostedemail.com (Postfix) with ESMTP for ; Thu, 12 Dec 2019 23:47:20 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga006.jf.intel.com ([10.7.209.51]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Dec 2019 15:47:19 -0800 X-IronPort-AV: E=Sophos;i="5.69,307,1571727600"; d="scan'208";a="216278692" Received: from ahduyck-desk1.jf.intel.com ([10.7.198.76]) by orsmga006-auth.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 12 Dec 2019 15:47:18 -0800 Message-ID: Subject: Re: [PATCH v15 0/7] mm / virtio: Provide support for free page reporting From: Alexander Duyck To: Alexander Duyck , 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 Cc: yang.zhang.wz@gmail.com, nitesh@redhat.com, konrad.wilk@oracle.com, david@redhat.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 Date: Thu, 12 Dec 2019 15:47:18 -0800 In-Reply-To: <20191205161928.19548.41654.stgit@localhost.localdomain> References: <20191205161928.19548.41654.stgit@localhost.localdomain> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.32.5 (3.32.5-1.fc30) MIME-Version: 1.0 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 Thu, 2019-12-05 at 08:22 -0800, Alexander Duyck wrote: > This series provides an asynchronous means of reporting free guest pages > to a hypervisor so that the memory associated with those pages can be > dropped and reused by other processes and/or guests on the host. Using > this it is possible to avoid unnecessary I/O to disk and greatly improve > performance in the case of memory overcommit on the host. > Changes from v14: > https://lore.kernel.org/lkml/20191119214454.24996.66289.stgit@localhost.localdomain/ > Renamed "unused page reporting" to "free page reporting" > Updated code, kconfig, and patch descriptions > Split out patch for __free_isolated_page > Renamed function to __putback_isolated_page > Rewrote core reporting functionality > Added logic to reschedule worker in 2 seconds instead of run to completion > Removed reported_pages statistics > Removed REPORTING_REQUESTED bit used in zone flags > Replaced page_reporting_dev_info refcount with state variable > Removed scatterlist from page_reporting_dev_info > Removed capacity from page reporting device > Added dynamic scatterlist allocation/free at start/end of reporting process > Updated __free_one_page so that reported pages are not always added to tail > Added logic to handle error from report function > Updated virtio-balloon patch that adds support for page reporting > Updated patch description to try and highlight differences in approaches > Updated logic to reflect that we cannot limit the scatterlist from device > Added logic to return error from report function > Moved documentation patch to end of patch set It has been about a week since I posted v15 and haven't heard anything. Consider this a gentle ping. I'm looking for input on patches 3 and 4 in this set as I updated them to address most of the concerns Mel had. Just wondering if the set needs additional work or if we are good with this as a starting point for this feature? Thanks. - Alex