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 4FA3710E6 for ; Fri, 2 Dec 2022 06:43:20 +0000 (UTC) Received: from [2a02:8108:963f:de38:eca4:7d19:f9a2:22c5]; authenticated by wp530.webpack.hosteurope.de running ExIM with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) id 1p0zlV-0000PL-Kq; Fri, 02 Dec 2022 07:43:17 +0100 Message-ID: <8d2dbbb5-5816-c1e9-e98c-6c64a8d85f81@leemhuis.info> Date: Fri, 2 Dec 2022 07:43:17 +0100 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:102.0) Gecko/20100101 Thunderbird/102.4.1 Subject: Re: [mm] f35b5d7d67: will-it-scale.per_process_ops -95.5% regression #forregzbot Content-Language: en-US, de-DE From: Thorsten Leemhuis To: "regressions@lists.linux.dev" Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org References: <202210181535.7144dd15-yujie.liu@intel.com> <87edv4r2ip.fsf@yhuang6-desk2.ccr.corp.intel.com> <84964891-5a39-adb2-3093-54b716ca94ae@leemhuis.info> In-Reply-To: <84964891-5a39-adb2-3093-54b716ca94ae@leemhuis.info> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-bounce-key: webpack.hosteurope.de;regressions@leemhuis.info;1669963400;f597bf89; X-HE-SMSGID: 1p0zlV-0000PL-Kq On 29.11.22 09:59, Thorsten Leemhuis wrote: > [Note: this mail is primarily send for documentation purposes and/or for > regzbot, my Linux kernel regression tracking bot. That's why I removed > most or all folks from the list of recipients, but left any that looked > like a mailing lists. These mails usually contain '#forregzbot' in the > subject, to make them easy to spot and filter out.] > > On 20.10.22 06:23, Nathan Chancellor wrote: >> [...] >> For what it's worth, I just bisected a massive and visible performance >> regression on my Threadripper 3990X workstation to commit f35b5d7d676e >> ("mm: align larger anonymous mappings on THP boundaries"), which seems >> directly related to this report/analysis. I initially noticed this >> because my full set of kernel builds against mainline went from 2 hours >> and 20 minutes or so to over 3 hours. Zeroing in on x86_64 allmodconfig, >> which I used for the bisect: > > Thanks for the report. To be sure below issue doesn't fall through the > cracks unnoticed, I'm adding it to regzbot, my Linux kernel regression > tracking bot: > > #regzbot ^introduced f35b5d7d676e59e4 > #regzbot title performance: mm: building Linux with clang takes a lot > longer (~27 %) > #regzbot ignore-activity #regzbot fix: revert "mm: align larger anonymous mappings on THP boundaries" Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) P.S.: As the Linux kernel's regression tracker I deal with a lot of reports and sometimes miss something important when writing mails like this. If that's the case here, don't hesitate to tell me in a public reply, it's in everyone's interest to set the public record straight.