From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from wp530.webpack.hosteurope.de (wp530.webpack.hosteurope.de [80.237.130.52]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 65F1EEC5 for ; Sun, 10 Apr 2022 07:27:41 +0000 (UTC) Received: from ip4d144895.dynamic.kabel-deutschland.de ([77.20.72.149] helo=[192.168.66.200]); authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1ndRyy-0003TV-1x; Sun, 10 Apr 2022 09:27:36 +0200 Message-ID: <3ab10248-be14-d161-14e6-bf19ac8cd998@leemhuis.info> Date: Sun, 10 Apr 2022 09:27:35 +0200 Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [regression] 5.15 kernel triggering 100x more inode evictions Content-Language: en-US To: Bruno Damasceno Freire , Filipe Manana , "dsterba@suse.cz" , Chris Mason , Josef Bacik , David Sterba , "linux-fsdevel@vger.kernel.org" , "regressions@lists.linux.dev" , linux-btrfs , "fdmanana@suse.com" References: <07bb78be-1d58-7d88-288b-6516790f3b5d@leemhuis.info> <35b62998-e386-2032-5a7a-07e3413b3bc1@leemhuis.info> <9163b8a9-e852-5786-24fa-d324e3118890@leemhuis.info> <20220408145222.GR15609@twin.jikos.cz> <74e4cc73-f16d-3e79-9927-1de3beea4a11@leemhuis.info> From: Thorsten Leemhuis In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1649575661;e0306e02; X-HE-SMSGID: 1ndRyy-0003TV-1x On 09.04.22 19:12, Bruno Damasceno Freire wrote: > On 08.04.22 04:50, Thorsten Leemhuis wrote: >> First off: David, Filipe, many thx for your answers, that helped me a >> lot to get a better picture of the situation! >> On 08.04.22 17:55, Filipe Manana wrote: >>> On Fri, Apr 08, 2022 at 04:52:22PM +0200, David Sterba wrote: >>>> On Fri, Apr 08, 2022 at 12:32:20PM +0200, Thorsten Leemhuis wrote: > >>> [...] >> >>> 6) In short, it is not known what causes the excessive evictions on 5.15 >>> on his machine for that specific workload - we don't have a commit to >>> point at and say it caused a regression. [...] >> >> Bruno, under these circumstances I'd say you need to bisect this to get >> us closer to the root of the problem (and a fix for it). Sadly that how >> it is sometimes, as briefly explained here: >> >> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/Documentation/admin-guide/reporting-regressions.rst#n140 > > Ok Thorsten. > > It's not sad at all: I had a great time researching this regression and > gained a lot of knowledge while doing so. The problem is that I am just a > simple user at its limits here and additional bisection is probably beyond my > abilities. Maybe, but I think you underestimate yourself here. Give it a try, it's not that hard once you figured out how to build and install a vanilla kernel (which you did already afaics; and if not: it's not that hard and you learn new stuff, too) and have some test case to check if the problem is there or now (which you already have afaics). Ciao, Thorsten