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 C1DA7E8FDB1 for ; Mon, 29 Dec 2025 09:46:57 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 17D7F6B0089; Mon, 29 Dec 2025 04:46:57 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 12B716B008A; Mon, 29 Dec 2025 04:46:57 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 003596B008C; Mon, 29 Dec 2025 04:46:56 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id E33E76B0089 for ; Mon, 29 Dec 2025 04:46:56 -0500 (EST) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 814B5161050 for ; Mon, 29 Dec 2025 09:46:56 +0000 (UTC) X-FDA: 84272029632.28.500BAE2 Received: from out-186.mta0.migadu.com (out-186.mta0.migadu.com [91.218.175.186]) by imf26.hostedemail.com (Postfix) with ESMTP id BBEC9140008 for ; Mon, 29 Dec 2025 09:46:54 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=ADEric+f; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf26.hostedemail.com: domain of qi.zheng@linux.dev designates 91.218.175.186 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1767001614; a=rsa-sha256; cv=none; b=lRAO1aAc7B2uldCWONbewdEWwHok+PVeE1XNPEgv21zfGOSuIG2hv+psIW1e2/NaP55j0g GpyTwjBYwniw5sqeQM9YzvZfU4+VzU/ZhBAWp20zdCZBJPtaMdYu0QSobS/nJ1g6ItQ2mB RG3QBD0mXPdieEojXUFp2jqx6qMTc6E= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=ADEric+f; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf26.hostedemail.com: domain of qi.zheng@linux.dev designates 91.218.175.186 as permitted sender) smtp.mailfrom=qi.zheng@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1767001614; 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:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=7OKyxTjD0H3g5gaPUdSXPikpKgZJEr/E+X1ne1t0XVQ=; b=zfFhqofVaH59axKtN8VLdHSATYc4gKG+HMnpU8vHdxW5BnH0epI79ozHoM/Frb59uH/EVr D8wv1Vbm8Ow9gLcIpy0t3HU/il7cgnmo8yNVBTojSiwMUTlIUi8fvh9WkUELV6RyKEbjee +Bh+rUeUxs7rL2off+I3BsdnZzauX6Y= Message-ID: <9bc4b18b-ef3a-486f-a911-f0bde17d0fda@linux.dev> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1767001612; 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: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7OKyxTjD0H3g5gaPUdSXPikpKgZJEr/E+X1ne1t0XVQ=; b=ADEric+fKhdk/4/PBMwv5RLooXGGqJ8T+4VjOhN/w522cWz+MZQsm13YJbhDGEOIPO8CzC QAvo0LeFbG8w/k1EzoJp+l6jxm9OzNuNugXTlERmkp4a5d6Ab4S2KrArB9RgAHKKCeP6UZ hruzehW/3NpqebHBeaTMA9lloLxmuC0= Date: Mon, 29 Dec 2025 17:46:43 +0800 MIME-Version: 1.0 Subject: Re: [PATCH v2 00/28] Eliminate Dying Memory Cgroup To: Harry Yoo Cc: Shakeel Butt , Yosry Ahmed , hannes@cmpxchg.org, hughd@google.com, mhocko@suse.com, roman.gushchin@linux.dev, muchun.song@linux.dev, david@kernel.org, lorenzo.stoakes@oracle.com, ziy@nvidia.com, imran.f.khan@oracle.com, kamalesh.babulal@oracle.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, chenridong@huaweicloud.com, mkoutny@suse.com, akpm@linux-foundation.org, hamzamahfooz@linux.microsoft.com, apais@linux.microsoft.com, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org References: <5dsb6q2r4xsi24kk5gcnckljuvgvvp6nwifwvc4wuho5hsifeg@5ukg2dq6ini5> <1264fd2b-e9bd-4a3b-86ad-eb919941f0a4@linux.dev> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Qi Zheng In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: BBEC9140008 X-Stat-Signature: smdrwnxaptdtmirq4opzhhtw815xmc7p X-Rspam-User: X-HE-Tag: 1767001614-45709 X-HE-Meta: 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 22FdxRR8 KK16iQMegzkrai89qJbGXEX8bQ7FrvBediNQeriI32MkLbohFWSNCExMhPmSYg30NoIzhwPfdzwdLOHxc60+NlBIRCmwfRS6tEzPKcaTHUiw/lGh6O+FquFewshWwcO9bQw2Csqm4cU6bxXO4wQ5Li4LL9cQekYdl5E8erwPyp4MqIS0awVi87fj0ZZTAEJsNnCDkGRAj1hJCk3WvywtiyvY3gLz01RHziW84g5pEriyDfLA= 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 12/29/25 5:35 PM, Harry Yoo wrote: > On Mon, Dec 29, 2025 at 03:48:26PM +0800, Qi Zheng wrote: >> >> >> On 12/24/25 7:20 AM, Shakeel Butt wrote: >>> On Tue, Dec 23, 2025 at 08:04:50PM +0000, Yosry Ahmed wrote: >>> [...] >>>> >>>> I think there might be a problem with non-hierarchical stats on cgroup >>>> v1, I brought it up previously [*]. I am not sure if this was addressed >>>> but I couldn't immediately find anything. >>> >>> Sigh, the curse of memcg-v1. Let's see what we can do to not break v1. >> >> The memcg-v1 was originally planned to be removed, could we skip >> supporting v1? > > You mean not reparenting LRU pages if CONFIG_MEMCG_V1 is set? > > That may work, but IMHO given that there is no clear timeline for removal > yet (some v1-specific features have been officially deprecated, > but memcg v1 as a whole hasn't), implementing Shakeel's suggestion [1] > may be a good option (it doesn't seem to add much complexity) > > But it can be argued that it's not good enough reason to > delay the series; adding support for V1 later sounds sensible to me. Yeah, I will continue to take a closer look at how to support memcg-v1. > > Anyway I'm fine either way and I'm not a memcg maintainer myself, > so this is just my two cents. > > [1] https://lore.kernel.org/linux-mm/wvj4w7ifmrifnh5bvftdziudsj52fdnwlhbt2oifwmxmi4eore@ob3mrfahhnm5/ >