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=-11.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=ham 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 DE432C4338F for ; Fri, 20 Aug 2021 23:16:35 +0000 (UTC) Received: from lists.sourceforge.net (lists.sourceforge.net [216.105.38.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 988CD61165; Fri, 20 Aug 2021 23:16:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 988CD61165 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.sourceforge.net Received: from [127.0.0.1] (helo=sfs-ml-2.v29.lw.sourceforge.com) by sfs-ml-2.v29.lw.sourceforge.com with esmtp (Exim 4.92.3) (envelope-from ) id 1mHDkV-0007U9-OC; Fri, 20 Aug 2021 23:16:31 +0000 Received: from [172.30.20.202] (helo=mx.sourceforge.net) by sfs-ml-2.v29.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92.3) (envelope-from ) id 1mHDkU-0007U3-Px for linux-f2fs-devel@lists.sourceforge.net; Fri, 20 Aug 2021 23:16:30 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sourceforge.net; s=x; h=Content-Transfer-Encoding:Content-Type:In-Reply-To: MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender:Reply-To: Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender: Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=GHe2pna7lkFC/IQ5eJDFWER4/vxrSMyatDzcBN9u2RY=; b=cKUXIAOH/5pLWeqyN0pzy5TWIT xvFRilayhmxQb8TFsncG1EHlyuXj0ofmFyptUwAaFWYFm0DC7stPjQNvxz7zSBU3Cgsmrusx4/WjS at0QLU1uchJgCXTzDCLQdCxU6+X8NqinEgIFeGJCmFjMMc+Zikqz4kEe6L0FWYCbYFX4=; DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sf.net; s=x ; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Sender:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Id:List-Help:List-Unsubscribe:List-Subscribe: List-Post:List-Owner:List-Archive; bh=GHe2pna7lkFC/IQ5eJDFWER4/vxrSMyatDzcBN9u2RY=; b=K4KkYR6Ja9kgUC0DJz8o4SNMFM qshoBfST3RP+2JUR6YuUHcHzZ0xRO8uCk8S5W/VOokyucQ0q8U7MLxwhWePs1wz10hn6SmHkUdHFT VOlGp0FnpSp35oZUuCFfXjKFkPTqfuPOEszIMqiB54B1t8D7ZWuxvE6MVmf0j5Z75zIw=; Received: from mail.kernel.org ([198.145.29.99]) by sfi-mx-2.v28.lw.sourceforge.com with esmtps (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.92.3) id 1mHDkT-0005Va-JV for linux-f2fs-devel@lists.sourceforge.net; Fri, 20 Aug 2021 23:16:30 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6D71561165; Fri, 20 Aug 2021 23:16:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629501378; bh=gND2D7ZmLJGqxBQEiaqUQVfu0fJGInr/zCwmlW7GWkQ=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=YKezb+LrZllD3p0QDSwLHv8XtHhksmhz1hYnqCZcuCRRI7vHZE1K+v0KpI2NDoifu MrMYvI6k1dUeSF6ZlArPzmZdHGyMGiQteiTUVhZjwc1L7ZH54WVfW7xM2csKj7xev4 /h7Oath5HxOCb7l5o3Nu9hrDDgjURiNdHT1hmm2TV5cGLvoCbyZ8COYECIJZPWTOkW bp/Trc9zHZvHen1JzVdSN2/a4v7lxVs5qI7FF2kkwNT+PX4z0XcCtZwDMEx12lwvd1 SiCsytxOMO0CuZgPye2en5D0lJC0KOlHkUV09JUxf4jWFo4D1A/l+E4ic8yHM56URC 5BnghgNnraWOQ== To: Daeho Jeong , linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, kernel-team@android.com References: <20210820222909.342198-1-daeho43@gmail.com> From: Chao Yu Message-ID: <501b84ea-b06e-7bcd-9aac-1422cfb6bae6@kernel.org> Date: Sat, 21 Aug 2021 07:16:17 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <20210820222909.342198-1-daeho43@gmail.com> Content-Language: en-US X-Headers-End: 1mHDkT-0005Va-JV Subject: Re: [f2fs-dev] [PATCH v5] f2fs: introduce periodic iostat io latency traces X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Daeho Jeong Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net On 2021/8/21 6:29, Daeho Jeong wrote: > From: Daeho Jeong > > Whenever we notice some sluggish issues on our machines, we are always > curious about how well all types of I/O in the f2fs filesystem are > handled. But, it's hard to get this kind of real data. First of all, > we need to reproduce the issue while turning on the profiling tool like > blktrace, but the issue doesn't happen again easily. Second, with the > intervention of any tools, the overall timing of the issue will be > slightly changed and it sometimes makes us hard to figure it out. > > So, I added the feature printing out IO latency statistics tracepoint > events, which are minimal things to understand filesystem's I/O related > behaviors, into F2FS_IOSTAT kernel config. With "iostat_enable" sysfs > node on, we can get this statistics info in a periodic way and it > would cause the least overhead. > > [samples] > f2fs_ckpt-254:1-507 [003] .... 2842.439683: f2fs_iostat_latency: > dev = (254,11), iotype [peak lat.(ms)/avg lat.(ms)/count], > rd_data [136/1/801], rd_node [136/1/1704], rd_meta [4/2/4], > wr_sync_data [164/16/3331], wr_sync_node [152/3/648], > wr_sync_meta [160/2/4243], wr_async_data [24/13/15], > wr_async_node [0/0/0], wr_async_meta [0/0/0] > > f2fs_ckpt-254:1-507 [002] .... 2845.450514: f2fs_iostat_latency: > dev = (254,11), iotype [peak lat.(ms)/avg lat.(ms)/count], > rd_data [60/3/456], rd_node [60/3/1258], rd_meta [0/0/1], > wr_sync_data [120/12/2285], wr_sync_node [88/5/428], > wr_sync_meta [52/6/2990], wr_async_data [4/1/3], > wr_async_node [0/0/0], wr_async_meta [0/0/0] > > Signed-off-by: Daeho Jeong Reviewed-by: Chao Yu Thanks, _______________________________________________ Linux-f2fs-devel mailing list Linux-f2fs-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel