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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8A2A8C4332F for ; Thu, 31 Mar 2022 11:44:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235301AbiCaLqe (ORCPT ); Thu, 31 Mar 2022 07:46:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57736 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235275AbiCaLq0 (ORCPT ); Thu, 31 Mar 2022 07:46:26 -0400 Received: from mail-pf1-x433.google.com (mail-pf1-x433.google.com [IPv6:2607:f8b0:4864:20::433]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8CC4E20826E; Thu, 31 Mar 2022 04:44:39 -0700 (PDT) Received: by mail-pf1-x433.google.com with SMTP id s11so21738271pfu.13; Thu, 31 Mar 2022 04:44:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=LqhDZuJaNJExg2VbnXlWCRZCk4FonU0BDi79M0pNs1Y=; b=a6w2jv0j2IXRlMA//J2ZPX5zjw/iXkppXRq2fKn/qS8pSuRYMsyjoCL+nv/nI9iAwD N05hjD3IhkfxgHzuA698es7oPx2BStKmYMj60ly7yidR7KxB2neoJnlS9LGQBaDgqCoL MBxNC55jtG1C8fOjS8esl4UTQaA5YDXYWmWSSn1BvsXJNoHrZeL7E0eD97K3HTCki8qB ciM73YG3g1YVlz/CpKlRhnQ6swh5Z7kKOdOqbaG6cnmS/bHRzg5YokctD5gCsPDpx+8j 4r0GaPfu4L7ZqZPeqUrHsZNayHgwg4cRILMVbGm39YSXO4+IGWkPHV6W95959WMdOTWc r83w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=LqhDZuJaNJExg2VbnXlWCRZCk4FonU0BDi79M0pNs1Y=; b=4bwK3aZUcs6KbrRWkLARfre+TrW7wPerniezK298q4iM1Ms80KreU2ToCopxzl5E/K yMcqAz9EjT8NqYkoUNE5s+AguCyTw7D1Z1x0/JOz/VySf7Oa1AmmJj0OOaDBdbkcd4tj zKdLd0bHkfonfUGQUJ6QjhX1w9WckfPYBgLDoCV6e/qNc2uvsYrNoevdf6Wp7SNO2bfH FoT6W3W4spl6n4zhMt7xamrN7r8h/2Sjmfokq9Oz2MYXFQsodWA3N0mHDY5yxUy5QPCF Gyym8zy5t2DmsZXWojV27jFZp/4GqXPXsoW4NZHgKVCi3zPsMFYchYCg/IZCTxeS7q2b fjdw== X-Gm-Message-State: AOAM533lcof8J44BdIDx2rhFXanJIW1ohUk2t+BoRdyf+PzzCabpigz9 SiQmmL92TykeLYZUtBHmpDjA8KAjy5WtbHgd X-Google-Smtp-Source: ABdhPJxswSNI4AFf4/OrTS5MowKZtDxmx8p8EIyMB33KcexfRHfuEpizNXIuzy6WINO1d1YmWjQJsQ== X-Received: by 2002:a63:ec47:0:b0:382:692a:dc04 with SMTP id r7-20020a63ec47000000b00382692adc04mr10417542pgj.352.1648727078998; Thu, 31 Mar 2022 04:44:38 -0700 (PDT) Received: from [192.168.43.80] (subs02-180-214-232-30.three.co.id. [180.214.232.30]) by smtp.gmail.com with ESMTPSA id t15-20020a63b70f000000b00381510608e9sm22520962pgf.14.2022.03.31.04.44.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 31 Mar 2022 04:44:38 -0700 (PDT) Message-ID: Date: Thu, 31 Mar 2022 18:44:31 +0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH v5] mm/vmstat: add events for ksm cow Content-Language: en-US To: cgel.zte@gmail.com, akpm@linux-foundation.org, david@redhat.com, willy@infradead.org Cc: corbet@lwn.net, yang.yang29@zte.com.cn, yang.shi@linux.alibaba.com, dave.hansen@linux.intel.com, saravanand@fb.com, minchan@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, jhubbard@nvidia.com, xu xin , Ran Xiaokai References: <20220331035616.2390805-1-yang.yang29@zte.com.cn> From: Bagas Sanjaya In-Reply-To: <20220331035616.2390805-1-yang.yang29@zte.com.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 31/03/22 10.56, cgel.zte@gmail.com wrote: > +Monitoring KSM events > +===================== > + > +There are some counters in /proc/vmstat that may be used to monitor KSM events. > +KSM might help save memory, it's a tradeoff by may suffering delay on KSM COW > +or on swapping in copy. Those events could help users evaluate whether or how > +to use KSM. For example, if cow_ksm increases too fast, user may decrease the > +range of madvise(, , MADV_MERGEABLE). > + Did you mean "tradeoff between possible delay on KSM COW and swapping in copy"? -- An old man doll... just what I always wanted! - Clara