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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 29368C433EF for ; Fri, 25 Feb 2022 22:34:58 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 765AD8D0002; Fri, 25 Feb 2022 17:34:57 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 714058D0001; Fri, 25 Feb 2022 17:34:57 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5DCC98D0002; Fri, 25 Feb 2022 17:34:57 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (relay.hostedemail.com [64.99.140.28]) by kanga.kvack.org (Postfix) with ESMTP id 464C98D0001 for ; Fri, 25 Feb 2022 17:34:57 -0500 (EST) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 0F39860697 for ; Fri, 25 Feb 2022 22:34:57 +0000 (UTC) X-FDA: 79182758634.01.679835F Received: from mail-ua1-f42.google.com (mail-ua1-f42.google.com [209.85.222.42]) by imf04.hostedemail.com (Postfix) with ESMTP id 3549B42E5F for ; Fri, 25 Feb 2022 22:10:11 +0000 (UTC) Received: by mail-ua1-f42.google.com with SMTP id g15so3082007ual.11 for ; Fri, 25 Feb 2022 14:10:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cloudflare.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=ejoK0vRa3ULoUvqBXFBUoQgK4eFO7l0YGvmemhAzd+8=; b=IbRISYyeGXb7dJeqldzIfH1Aisr9vxENZXFv0iy2+ui/hkTCBb1UVgAzVfDpIDKfSU VgDORthpvEb3B3con8Czqm2QsIvnt6IvbGLkSKxkkrY5zuFz3rSl0UuNkItF6IJpzM5C pxky7Dp8Gq28oeNaHKOt8OQRSCpPGIbP0Jyuw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=ejoK0vRa3ULoUvqBXFBUoQgK4eFO7l0YGvmemhAzd+8=; b=6TPLBB/JLFKyXQOaE3NUW3Yx1EMdZPCoAyq/EiNDct8SMozyEeLF/4TUENpzSFZgAk 0UxwzAbunNywXhQNXdm6mQOYGKf4MHl/xU2dSAQI6XG808p9hjSCX1JVyaPDwLAeCxy/ lPwEaS37ork+bwpJu7AXOJee8aZFwpMFXj/FGHessmmsvyaa8sqRom8tTK/BdyF9xE6A jfwkZtr5GUVnU6StJDuSBcm3LxvGqL9LhqTmjPF+wKNa9dNnK0s/K78QXloZhLtTGctM 5c/1THvigR1GCDKAER3axIzx+DRG47e7oQxD872oUWwuT9lOHDMedLBLBy2D0FiMQ+RH AwDA== X-Gm-Message-State: AOAM53256+aq7A1N+pOf1SZ67hjecF166S/Vjh/7/agc3RMdJXezR5FL jBEFEjp0jbuIZv2HGaT+cOJn/0gzYRWojw1ZSgRZ3w1F0dkNRA== X-Google-Smtp-Source: ABdhPJxPyDSRBTJXsp0x0FqWBbEIs0XLySvB37F9yApCDCAvKayDrMCIwYC0OFydHHoL7y4EpVwCIwhfoVXjp0VpP1c= X-Received: by 2002:a0d:d687:0:b0:2d6:9079:9595 with SMTP id y129-20020a0dd687000000b002d690799595mr8968010ywd.32.1645812495144; Fri, 25 Feb 2022 10:08:15 -0800 (PST) MIME-Version: 1.0 References: <20220224165838.oir5clpkkqpstpx3@google.com> <20220224185236.qgzm3jpoz2orjfcw@google.com> <20220225180345.GD12037@blackbody.suse.cz> In-Reply-To: <20220225180345.GD12037@blackbody.suse.cz> From: Ivan Babrou Date: Fri, 25 Feb 2022 10:08:04 -0800 Message-ID: Subject: Re: Regression in workingset_refault latency on 5.15 To: =?UTF-8?Q?Michal_Koutn=C3=BD?= Cc: Daniel Dao , Shakeel Butt , kernel-team , Linux MM , Johannes Weiner , Roman Gushchin , Feng Tang , Michal Hocko , Hillf Danton , Andrew Morton , Linus Torvalds Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 3549B42E5F X-Stat-Signature: msf5spoqcjc4mccwc7pofxnmdo6p777n Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=cloudflare.com header.s=google header.b=IbRISYye; spf=none (imf04.hostedemail.com: domain of ivan@cloudflare.com has no SPF policy when checking 209.85.222.42) smtp.mailfrom=ivan@cloudflare.com; dmarc=pass (policy=reject) header.from=cloudflare.com X-HE-Tag: 1645827011-302996 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000004, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Feb 25, 2022 at 10:03 AM Michal Koutn=C3=BD wrot= e: > BTW how many levels deep is the affected memory cgroup hierarchy (where > the workingset_refault happens)? (Self answer: Probably less than > nr_cpus*MEMCG_BATCH, so not relevant.) It's /system.slice/thingy.service (a regular systemd unit on cgroupv2), so not very deep.