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 EC61AC54EBD for ; Tue, 10 Jan 2023 02:44:16 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 474C78E0002; Mon, 9 Jan 2023 21:44:16 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 425698E0001; Mon, 9 Jan 2023 21:44:16 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 313B98E0002; Mon, 9 Jan 2023 21:44:16 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 21CA58E0001 for ; Mon, 9 Jan 2023 21:44:16 -0500 (EST) Received: from smtpin14.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id E4722A2759 for ; Tue, 10 Jan 2023 02:44:15 +0000 (UTC) X-FDA: 80337345270.14.C07B0A0 Received: from r3-18.sinamail.sina.com.cn (r3-18.sinamail.sina.com.cn [202.108.3.18]) by imf03.hostedemail.com (Postfix) with ESMTP id 360B920008 for ; Tue, 10 Jan 2023 02:44:11 +0000 (UTC) Authentication-Results: imf03.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf03.hostedemail.com: domain of hdanton@sina.com designates 202.108.3.18 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1673318654; 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-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tbRPFASVdnQNsrNODQiiv5WISeScdyCPxUwCqCQ6CAo=; b=bd7uEfhqSRp+7TQrJUCeWsWcp93E74isC3F3948kF15Lqxxe1WGs9odXjNjbiFXMG1nBfJ AgvU4wTXQYDGxwn/y0FNTSCICkEf45CEQXPKbtUQY8OcMkIxTe+U+YMJblBxMNj6SU10EP H4sfXYPrC2M0YBFkEtZ9YnjZD8deP/g= ARC-Authentication-Results: i=1; imf03.hostedemail.com; dkim=none; dmarc=none; spf=pass (imf03.hostedemail.com: domain of hdanton@sina.com designates 202.108.3.18 as permitted sender) smtp.mailfrom=hdanton@sina.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1673318654; a=rsa-sha256; cv=none; b=f1jl32cFNwCjS0up0KmPleD1rgUGGeT31hn6yBC+aB82ERYC5OQIPJddZG4dtoKVkQ0JNd n/AUZr4EBVU6RiTGyaz6s0/GoNSMJA+Bbrv/JFWl3njM3/RtlPiYk1qgj9JwiGtsVuxNDX 3mlwit0HltB2HqU1XSPU0s3Ua/TRjHk= Received: from unknown (HELO localhost.localdomain)([114.249.61.130]) by sina.com (172.16.97.35) with ESMTP id 63BCD02C0000F529; Tue, 10 Jan 2023 10:40:46 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com X-SMAIL-MID: 42035115076162 From: Hillf Danton To: Marcelo Tosatti Cc: atomlin@atomlin.com, frederic@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v13 3/6] mm/vmstat: manage per-CPU stats from CPU context when NOHZ full Date: Tue, 10 Jan 2023 10:43:56 +0800 Message-Id: <20230110024356.336-1-hdanton@sina.com> In-Reply-To: References: <20230105125218.031928326@redhat.com> <20230106001244.4463-1-hdanton@sina.com> <20230106150154.4560-1-hdanton@sina.com> <20230107001529.4617-1-hdanton@sina.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 360B920008 X-Stat-Signature: yhzx1om43wwao593bq5ksww83jgbqn5m X-HE-Tag: 1673318651-194903 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000046, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 9 Jan 2023 11:12:49 -0300 Marcelo Tosatti > > Yes, but if you do not return to userspace, then the per-CPU vm > statistics can be dirty indefinitely. Could you specify the reasons for failing to return to userspace, given it is undesired intereference for the shepherd to queue work on the isolated CPUs.