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 47F1C72 for ; Sun, 28 Nov 2021 12:08:25 +0000 (UTC) Received: from shark4.inbox.lv (localhost [127.0.0.1]) by shark4-out.inbox.lv (Postfix) with ESMTP id A3A42C008C; Sun, 28 Nov 2021 13:58:31 +0200 (EET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=inbox.lv; s=30062014; t=1638100711; bh=dEctK94YixwRqHyBW6ErQeBzCnjwBwzYFVw8iMyoARc=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=LXuq/rFNl9fOWw4/p6voFwpdyc35JnqMsSXEdXMzBeWuSWtIXF7C2DPjBB0m9Yu6b wGYvLRie7tP9n8kZGB3WGGUYYvPoa0lPZMBxgHf+y20k0nS6ckEW+GKmBv0UPmJGyQ rwWW20hZ4Ojb4SzqOwzKwLQWpqRWT+ZMaqEm1aSU= Received: from localhost (localhost [127.0.0.1]) by shark4-in.inbox.lv (Postfix) with ESMTP id 97EA5C007C; Sun, 28 Nov 2021 13:58:31 +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 FDZJno_ILohd; Sun, 28 Nov 2021 13:58:31 +0200 (EET) Received: from mail.inbox.lv (pop1 [127.0.0.1]) by shark4-in.inbox.lv (Postfix) with ESMTP id 22D53C0078; Sun, 28 Nov 2021 13:58:31 +0200 (EET) Date: Sun, 28 Nov 2021 20:58:05 +0900 From: Alexey Avramov To: Mike Galbraith Cc: Mel Gorman , Andrew Morton , Michal Hocko , Vlastimil Babka , Rik van Riel , 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: <20211128205805.466bf311@mail.inbox.lv> In-Reply-To: <252cd5acd9bf6588ec87ce02884925c737b6a8b7.camel@gmx.de> References: <20211125151853.8540-1-mgorman@techsingularity.net> <20211127011246.7a8ac7b8@mail.inbox.lv> <20211126165211.GL3366@techsingularity.net> <20211128042635.543a2d04@mail.inbox.lv> <252cd5acd9bf6588ec87ce02884925c737b6a8b7.camel@gmx.de> 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: AJ2EQ38cmnBBsMa9LpgOlO7lx8rAJVdB2DuJsLBwtjJFz9PMtNdrcW+QBYXuHxy7cWTD I tested this patch [1] on top of the 2nd Mel's patch [2]. Test case: Running firefox with youtube tab (basic desktop workload) and starting $ for i in {1..10}; do tail /dev/zero; done -- 1. with noswap and 2. with SwapTotal > MemTotal and swappiness=0. - With noswap 2021-11-28 20:13:18,755: Stall times for the last 296.0s: 2021-11-28 20:13:18,755: ----------- 2021-11-28 20:13:18,755: some cpu 8.6s, avg 2.9% 2021-11-28 20:13:18,755: ----------- 2021-11-28 20:13:18,755: some io 253.7s, avg 85.7% 2021-11-28 20:13:18,755: full io 228.9s, avg 77.3% 2021-11-28 20:13:18,755: ----------- 2021-11-28 20:13:18,755: some memory 135.1s, avg 45.7% 2021-11-28 20:13:18,755: full memory 134.3s, avg 45.4% mem: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch4/noswap/mem psi: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch4/noswap/psi - With swappiness=0 2021-11-28 20:29:35,229: Stall times for the last 257.9s: 2021-11-28 20:29:35,229: ----------- 2021-11-28 20:29:35,229: some cpu 7.7s, avg 3.0% 2021-11-28 20:29:35,229: ----------- 2021-11-28 20:29:35,229: some io 223.1s, avg 86.5% 2021-11-28 20:29:35,230: full io 196.2s, avg 76.1% 2021-11-28 20:29:35,230: ----------- 2021-11-28 20:29:35,230: some memory 170.8s, avg 66.2% 2021-11-28 20:29:35,230: full memory 167.9s, avg 65.1% mem: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch4/swappiness0/mem psi: https://raw.githubusercontent.com/hakavlad/cache-tests/main/516-reclaim-throttle/516-rc2/patch4/swappiness0/psi There are still some freezes, although in some cases there are no significant stalls. 13-17s average stall vs 0.4s with 5.15 [1] https://lore.kernel.org/lkml/252cd5acd9bf6588ec87ce02884925c737b6a8b7.camel@gmx.de/ [2] https://lore.kernel.org/lkml/20211124143303.GH3366@techsingularity.net/