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 2D5A5D149D9 for ; Fri, 25 Oct 2024 17:41:02 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B08596B0095; Fri, 25 Oct 2024 13:41:01 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id AB87D6B0096; Fri, 25 Oct 2024 13:41:01 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9805F6B0098; Fri, 25 Oct 2024 13:41:01 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 796CB6B0095 for ; Fri, 25 Oct 2024 13:41:01 -0400 (EDT) Received: from smtpin11.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 89B091C6A12 for ; Fri, 25 Oct 2024 17:40:38 +0000 (UTC) X-FDA: 82712839944.11.419E018 Received: from out-186.mta1.migadu.com (out-186.mta1.migadu.com [95.215.58.186]) by imf25.hostedemail.com (Postfix) with ESMTP id 3623BA0006 for ; Fri, 25 Oct 2024 17:40:44 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=t9x9nvfx; spf=pass (imf25.hostedemail.com: domain of roman.gushchin@linux.dev designates 95.215.58.186 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1729877981; a=rsa-sha256; cv=none; b=X6O3/dQ2AkdfBztSCRO2kQ5OYRFuemErtF939WjuLD1WIJJlgc0YNO5708DXxZraIRhILM MdzBVe/q393uLrXzEqf4EG5gheAwT5vjylDwF+vOMrcq0VRLapx4Rd5Zlf2TtFfv8sFC8b peQOgfTAnEj9jdtdLNEGMUtHkXzXEgo= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=t9x9nvfx; spf=pass (imf25.hostedemail.com: domain of roman.gushchin@linux.dev designates 95.215.58.186 as permitted sender) smtp.mailfrom=roman.gushchin@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1729877981; 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=/ZZi0QQzXVADJVHeSO90RuV4/Uz17msU1AAdrvd9myA=; b=TUbq/2fa9iM2sGq89AWFPAwKYbuY6P1zdw9Lnv4iOirCorRf/OKQ+EdrIgUrjkXlU1LLiR WanmL5k4odC9/0KYVgOjDUgeJ8XN9FSszwiwQ/lkztjSziWRwvKq2XowZLp4CHNDGjJdz6 Wb4kQUeTjr07mqaOoVvuwza4OAftjhY= Date: Fri, 25 Oct 2024 17:40:51 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1729878058; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/ZZi0QQzXVADJVHeSO90RuV4/Uz17msU1AAdrvd9myA=; b=t9x9nvfxObepocqu22ZGalnaw5WyowMFOnhdtW95javKxOw2rn1LId+pNkikqCUPI6owI6 AOCgkE3E2sK+bgLi8IQ9dCAYNERchWN723IaCv4CscWeyZIssFz5ILV+0PT19Qq/SWhK+m 6NEJ30lUtccs+x1Lar6YtgdwuvLNksk= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Roman Gushchin To: Shakeel Butt Cc: Andrew Morton , Johannes Weiner , Michal Hocko , Muchun Song , Hugh Dickins , Yosry Ahmed , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, Meta kernel team Subject: Re: [PATCH v1 4/6] memcg-v1: no need for memcg locking for writeback tracking Message-ID: References: <20241025012304.2473312-1-shakeel.butt@linux.dev> <20241025012304.2473312-5-shakeel.butt@linux.dev> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20241025012304.2473312-5-shakeel.butt@linux.dev> X-Migadu-Flow: FLOW_OUT X-Stat-Signature: yhr7skyndtximnopscfdsit3dtokxhsg X-Rspamd-Queue-Id: 3623BA0006 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1729878044-152835 X-HE-Meta: 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 8zOXEqiF FPydQaqcJvaD5ISiOQ+jX+uub9QDb5UsQOL5ozOwS65GchaDbRYpaj2uBrpe+g25N7jwo4awCreVtCL496dccAlUBP0NTF4qQmp6CG1b5wZurPSOivO4Sckd5WCJiIRcK1ogN/NcJFVYxDBehoS5zm2b7MXJTiAHno9cEPdOSglImxx3qNZcG2QLmkg== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Oct 24, 2024 at 06:23:01PM -0700, Shakeel Butt wrote: > During the era of memcg charge migration, the kernel has to be make sure > that the writeback stat updates do not race with the charge migration. > Otherwise it might update the writeback stats of the wrong memcg. Now > with the memcg charge migration deprecated, there is no more race for > writeback stat updates and the previous locking can be removed. > > Signed-off-by: Shakeel Butt Reviewed-by: Roman Gushchin