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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 8867810D14A6 for ; Mon, 30 Mar 2026 12:03:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id CBE366B009F; Mon, 30 Mar 2026 08:03:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C95C36B00A0; Mon, 30 Mar 2026 08:03:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BABCE6B00A2; Mon, 30 Mar 2026 08:03:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id A8B646B009F for ; Mon, 30 Mar 2026 08:03:35 -0400 (EDT) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 306B316076B for ; Mon, 30 Mar 2026 12:03:35 +0000 (UTC) X-FDA: 84602594790.06.7D0E4C5 Received: from mail-wm1-f54.google.com (mail-wm1-f54.google.com [209.85.128.54]) by imf27.hostedemail.com (Postfix) with ESMTP id 07E024000B for ; Mon, 30 Mar 2026 12:03:32 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=suse.com header.s=google header.b=Q5te9fK6; dmarc=pass (policy=quarantine) header.from=suse.com; spf=pass (imf27.hostedemail.com: domain of mhocko@suse.com designates 209.85.128.54 as permitted sender) smtp.mailfrom=mhocko@suse.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1774872213; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=h/pCkZp0kOo5osdLzRpybPSjj/VyMtaU3zoXyQksTzs=; b=BU4hT0wV2G+GeYnCQJPOcPKajsb5DtfqgfosDJLUq3QFEUl+SZtcuiEAS0JmWwPBuxw/3Q YUyDQmhVFdik+6t3QdeZywXMTpy4bvvskvwREBP6wNJZX6E/LCCeT/ePAmzkkRzKuO+r2b b/B0xK16h38VNHPftYbtG8Qi7BT3s4c= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1774872213; a=rsa-sha256; cv=none; b=FFgMazeBiiYHAarJrRb4vGpqArn2swguYbEpUoro1Io0BaoVp3829suyDEtxJ9Wdete7Wc EcgRe3/iJ87ajsh1lsrYH5rFpppKTQJlHZvFy4N/6HrmV3bJ1iRyojrvwHPpraRq5T2b9l rqGXkHDk5do5rEseL/5sB+nvv+uHeIE= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=suse.com header.s=google header.b=Q5te9fK6; dmarc=pass (policy=quarantine) header.from=suse.com; spf=pass (imf27.hostedemail.com: domain of mhocko@suse.com designates 209.85.128.54 as permitted sender) smtp.mailfrom=mhocko@suse.com Received: by mail-wm1-f54.google.com with SMTP id 5b1f17b1804b1-486fba7ce4cso44173585e9.3 for ; Mon, 30 Mar 2026 05:03:32 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=google; t=1774872211; x=1775477011; darn=kvack.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:from:to:cc:subject:date:message-id:reply-to; bh=h/pCkZp0kOo5osdLzRpybPSjj/VyMtaU3zoXyQksTzs=; b=Q5te9fK6m2bX9xE8HLNyq3FXH4XCtHl4ENCM3uKl+P6DGKawpYIbJSTcohH3YPUDKA YCiyNwziXDoOBJY2H6ZPRHXsi8Aq8DpD99cNNaGralRIMPLozdLgGxBwSMlrvvi3fHfb LXB1hvgk5B2acJjD+vR6pnxYJGbyMH5bR3Tt7iHjRIct/nSGvhbECmDCLCQ2K0m0iCWw ow7fj3euCMWEEbJpiTGiRjsy0NE6DzN914cCeXsBh6IcUi9u1VL5kLk12G2Pu6qzXWrW 1LC+ycMi80nqBiTz7AbP5bp/rONcJ1G49EnE8V8GfvTqSs3kRYcvVYYTbaxOp3b/6Mkx YRSg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1774872211; x=1775477011; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-gg:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=h/pCkZp0kOo5osdLzRpybPSjj/VyMtaU3zoXyQksTzs=; b=VinU2be6Zvan/pwt1lmuGgTjCfxyJQkVXm1G1Cnt8cZPwPgJzloQyHZGzpkmpOR3w/ XGIbLxvouwoQaB54zbXnfT9KS/5ZdPZd7q8KBysc1kHEXogh9FFkbX55f5F/8SCxmCUU rDLW/7ezMU+Set56ARcNWyjPCJhqljtkOsk4VPAArJVIXCcjRolmAdfq4qDoQr4c8r/s joyWM47BCyNfAaxCemFTuP7QbZ87e0gaxbKNtFJwuSpb/TVEJwjxZvD1ocqkMENRJLzH He1NAg3zFFKcAvtADJ+QVJJWIvkevdDfDY3bhIs95MyYoAzV2Qy6ukkNU7k52DbEHVd6 utng== X-Forwarded-Encrypted: i=1; AJvYcCWGSACqsz6EQtG36P0mp3MltLnu2p/yjZgr+i1t2zwpbysjS5NFuI2WkdwR++y4C/5JMkBXhAFAXQ==@kvack.org X-Gm-Message-State: AOJu0Yz4Z5ZOs6TaU+BUJ45gIbLnRSKjDuyCmFMa6bVS1fGrj/kbhwUF Y2qwcgpyqm1wivDPWRRGx5k+iIzxXk39Oji/Zy3mK5PEpt5EP6QaoBNWH/sxIVUrvcU= X-Gm-Gg: ATEYQzwQBMqqVlKSvoUjqxh3CiE5OCj9m1pFgBPdDMOF2D7mMB0mYb7Mcsf2Maiddpd uCU4Dtmr3ts/ixKvgcjqoQ0fkFTaxm7N2LnUdysqjNkevn13eIDIqZ0HJXI6M2FFVCNMkJeLxw3 y66TGQ88dyExbobtmVp7rHEx0QYBy1PIAXxBTyeoMFoAMqV4+hpxLuGQhxk84F+HWPp/MpSJZFi g5rmEw16NKldcKaT9rZb+LoqRIAuNwdtDjmFSYsyRYSzbyUjrD99bjxjs0jT3P3+Jrv/MTvIFo2 ho9cS7/mdAasoiXGIVp/fiiQy9Vujor/6xwXg9yngLjT/jycmIEALmSSuVGhRHequXV/Ol7R2Tq NuL80sr46y1/SH/PTeMSpEZKb87QYypR5Wc3n/ndQhGYkG1GECUT3aH1hZBjqOD/CerNdc877XC UcIZQ5Fliser0hEIEiq8EvOQZwdp2Ap5m3OiyC X-Received: by 2002:a05:600c:1d8c:b0:480:69b6:dfed with SMTP id 5b1f17b1804b1-48727efabf6mr230701685e9.24.1774872211429; Mon, 30 Mar 2026 05:03:31 -0700 (PDT) Received: from localhost (109-81-17-175.rct.o2.cz. [109.81.17.175]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48727192012sm79669865e9.32.2026.03.30.05.03.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 Mar 2026 05:03:31 -0700 (PDT) Date: Mon, 30 Mar 2026 14:03:29 +0200 From: Michal Hocko To: Joshua Hahn Cc: Johannes Weiner , Andrew Morton , Roman Gushchin , Shakeel Butt , Muchun Song , David Hildenbrand , Lorenzo Stoakes , Vlastimil Babka , Dennis Zhou , Tejun Heo , Christoph Lameter , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com Subject: Re: [PATCH] mm/percpu, memcontrol: Per-memcg-lruvec percpu accounting Message-ID: References: <20260327191936.1980054-1-joshua.hahnjy@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260327191936.1980054-1-joshua.hahnjy@gmail.com> X-Rspamd-Queue-Id: 07E024000B X-Stat-Signature: s6b9pxwzn88xmgyfm73z7bywo88h5hd8 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1774872212-625854 X-HE-Meta: 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 gxyYTzex mHNklvcn1prt7T8jt86dPGH0iDGFKVjuRfOjVw3LAIWlH8cTRuY/YemSTTrlcbZIgBV9AwYAq7+9ToCa2fkjGmjWLzjmdIe2WmGd2/Wm2jOZHV64dcVYYjpdrmb9ZHrDPFf6b0alcB2HX80At1Whfi0tL+DiSTofuBSoDXYsuF6n2wi6BJc3cKTPBlQu2Wb43W+B5LeS9mLaLDcLFbJC86FQie9QgOpZRwz/jZGzoBUtNG78Bf6quP6qNed5CwoTmkSDcZglY1/bcAHL53giyuyW79HzYLdEWIwxSNeVMh7UzaYpjbCueaAXn8059pWFZPmxaoJKZF/ImSfw3Z24nQ4N0mRXQhqzAlFtlAEUPdTJcMSTVz+fCMsJMkTdEXaiikpJt3FCM5FNnxNnslwIPLrNm5e5FGcxP/P/Xpm7e5chxZOg= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri 27-03-26 12:19:35, Joshua Hahn wrote: > Convert MEMCG_PERCPU_B from a memcg_stat_item to a memcg_node_stat_item > to give visibility into per-node breakdowns for percpu allocations and > turn it into NR_PERCPU_B. Why do we need/want this? -- Michal Hocko SUSE Labs