From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from shark4.inbox.lv (shark4.inbox.lv [194.152.32.84]) (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 C4ADA68 for ; Tue, 30 Nov 2021 16:04:08 +0000 (UTC) Received: from shark4.inbox.lv (localhost [127.0.0.1]) by shark4-out.inbox.lv (Postfix) with ESMTP id 0B852C01B9; Tue, 30 Nov 2021 18:04:00 +0200 (EET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=inbox.lv; s=30062014; t=1638288240; bh=MaBmrbP8dDC347/MJhlAP6RXqkK7vpRItGnOjqKVKMc=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=NHNGWgWsZJ0U++0xL+tMHjxROjFFZ/sdn4qopEIzHxDtyrUFP4nkbPUkdk0PGvmPU bbAtMtPxn6lE1RTAMHf7rcZHmk13R+Aw042Wb5lv5NJS6683c6bFAjfWHKYiaCpqau +C6ATRtiK7Z8iF+gG+/sd2Jqghb6wZPHk6t3bfd8= Received: from localhost (localhost [127.0.0.1]) by shark4-in.inbox.lv (Postfix) with ESMTP id F33CCC01A8; Tue, 30 Nov 2021 18:03:59 +0200 (EET) Received: from shark4.inbox.lv ([127.0.0.1]) by localhost (shark4.inbox.lv [127.0.0.1]) (spamfilter, port 35) with ESMTP id wR-tlqMNy4Vw; Tue, 30 Nov 2021 18:03:59 +0200 (EET) Received: from mail.inbox.lv (pop1 [127.0.0.1]) by shark4-in.inbox.lv (Postfix) with ESMTP id 76F78C018F; Tue, 30 Nov 2021 18:03:59 +0200 (EET) Date: Wed, 1 Dec 2021 01:03:48 +0900 From: Alexey Avramov To: Mel Gorman Cc: Andrew Morton , Michal Hocko , Vlastimil Babka , Rik van Riel , Mike Galbraith , Darrick Wong , regressions@lists.linux.dev, Linux-fsdevel , Linux-MM , LKML Subject: Re: [PATCH 1/1] mm: vmscan: Reduce throttling due to a failure to make progress Message-ID: <20211201010348.31e99637@mail.inbox.lv> In-Reply-To: <20211129150117.GO3366@techsingularity.net> References: <20211125151853.8540-1-mgorman@techsingularity.net> <20211127011246.7a8ac7b8@mail.inbox.lv> <20211129150117.GO3366@techsingularity.net> X-Mailer: Claws Mail 3.14.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: regressions@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Virus-Scanned: OK X-ESPOL: G4mERXADmHlDpsG9Ippu5OH4tai+FgVjoUWJw7wx9RAtu7LHst18d2eTGIHzanG0EAbD I tested this [1] patch on top of 5.16-rc2. It's the same test with 10 tails. - with noswap Summary: 2021-11-30 23:32:36,890: Stall times for the last 548.6s: 2021-11-30 23:32:36,890: ----------- 2021-11-30 23:32:36,891: some cpu 3.7s, avg 0.7% 2021-11-30 23:32:36,891: ----------- 2021-11-30 23:32:36,891: some io 187.6s, avg 34.2% 2021-11-30 23:32:36,891: full io 178.3s, avg 32.5% 2021-11-30 23:32:36,891: ----------- 2021-11-30 23:32:36,892: some memory 392.2s, avg 71.5% 2021-11-30 23:32:36,892: full memory 390.7s, avg 71.2% full psi: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap/psi mem: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap/mem - with swappiness=0 Summary: 2021-11-30 23:51:48,969: Stall times for the last 919.4s: 2021-11-30 23:51:48,969: ----------- 2021-11-30 23:51:48,969: some cpu 5.5s, avg 0.6% 2021-11-30 23:51:48,970: ----------- 2021-11-30 23:51:48,970: some io 240.4s, avg 26.2% 2021-11-30 23:51:48,970: full io 230.6s, avg 25.1% 2021-11-30 23:51:48,970: ----------- 2021-11-30 23:51:48,970: some memory 806.1s, avg 87.7% 2021-11-30 23:51:48,971: full memory 800.5s, avg 87.1% psi log: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/swappiness0/psi mem log: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/swappiness0/mem In some cases stalls was very short, but in many cases stalls was long. The result is still not good enough. offtop ====== The same test with the patch [1] on top of 5.16-rc2 + le9 patch [2] with vm.clean_min_kbytes=99000. - with noswap Summary: 2021-11-30 23:59:32,209: Stall times for the last 73.1s: 2021-11-30 23:59:32,209: ----------- 2021-11-30 23:59:32,209: some cpu 0.4s, avg 0.5% 2021-11-30 23:59:32,209: ----------- 2021-11-30 23:59:32,210: some io 5.8s, avg 8.0% 2021-11-30 23:59:32,210: full io 5.3s, avg 7.3% 2021-11-30 23:59:32,210: ----------- 2021-11-30 23:59:32,210: some memory 3.3s, avg 4.5% 2021-11-30 23:59:32,210: full memory 3.1s, avg 4.2% This is just an example of what a result close to the expected result might be (especially note io pressure values). full psi: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap_le9_min99k/psi mem: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch5/noswap_le9_min99k/mem [1] https://lore.kernel.org/lkml/20211129150117.GO3366@techsingularity.net/ [2] https://lore.kernel.org/all/20211130201652.2218636d@mail.inbox.lv/