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=-3.8 required=3.0 tests=BAYES_00, 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 3712EC433DB for ; Thu, 25 Mar 2021 07:04:55 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id D2066619A0 for ; Thu, 25 Mar 2021 07:04:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D2066619A0 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 574FA6B006E; Thu, 25 Mar 2021 03:04:54 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 512566B0070; Thu, 25 Mar 2021 03:04:54 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3D9466B0071; Thu, 25 Mar 2021 03:04:54 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0099.hostedemail.com [216.40.44.99]) by kanga.kvack.org (Postfix) with ESMTP id 20A036B006E for ; Thu, 25 Mar 2021 03:04:54 -0400 (EDT) Received: from smtpin30.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id D144545C1 for ; Thu, 25 Mar 2021 07:04:53 +0000 (UTC) X-FDA: 77957509266.30.BC4F76E Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by imf11.hostedemail.com (Postfix) with ESMTP id A97C2200024B for ; Thu, 25 Mar 2021 07:04:49 +0000 (UTC) IronPort-SDR: 9Z77HTjkjDHpmxHsLzmswpcxxMEc06Ml40MhjDZxAjs9e1DyQOOXi5H+qG9BiN9b20QSn5QYsL OCT74ZTz/sQA== X-IronPort-AV: E=McAfee;i="6000,8403,9933"; a="188571716" X-IronPort-AV: E=Sophos;i="5.81,277,1610438400"; d="scan'208";a="188571716" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2021 00:04:50 -0700 IronPort-SDR: KdHf2dmxe9dKO0eIzS8CW/GKAzivI98cB80vHMnEJ8pB+IgA9Q+xYLYNp+OL3AvqhojBOdXufK YdBZ8Ra12aOA== X-IronPort-AV: E=Sophos;i="5.81,277,1610438400"; d="scan'208";a="514495848" Received: from yhuang6-desk1.sh.intel.com (HELO yhuang6-desk1.ccr.corp.intel.com) ([10.239.13.1]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2021 00:04:47 -0700 From: "Huang, Ying" To: Joonsoo Kim Cc: linux-mm@kvack.org Subject: About used-once anon-pages Date: Thu, 25 Mar 2021 15:04:45 +0800 Message-ID: <875z1fiuia.fsf@yhuang6-desk1.ccr.corp.intel.com> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=ascii X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: A97C2200024B X-Stat-Signature: tk4q5aghpwfdfcsszwduqw469w66t1jc Received-SPF: none (intel.com>: No applicable sender policy available) receiver=imf11; identity=mailfrom; envelope-from=""; helo=mga04.intel.com; client-ip=192.55.52.120 X-HE-DKIM-Result: none/none X-HE-Tag: 1616655889-153335 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: Hi, Kim, >From the commit log of the commit b518154e59aa ("mm/vmscan: protect the workingset on anonymous LRU"), you referred to the "used-once" anon-pages. I have known about the use cases about used-once file cache pages. But I don't know the use cases about the used-once anon-pages. Can you teach me about that? Or you doesn't mean used-once exactly, but accessing the pages for a while after allocating the page, then never touch it again? Best Regards, Huang, Ying