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 6C180C25B74 for ; Fri, 24 May 2024 20:36:30 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 9BE276B008C; Fri, 24 May 2024 16:36:29 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 96DB36B0092; Fri, 24 May 2024 16:36:29 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 85CD46B0093; Fri, 24 May 2024 16:36:29 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id 67A126B008C for ; Fri, 24 May 2024 16:36:29 -0400 (EDT) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id 2A6ED120128 for ; Fri, 24 May 2024 20:36:29 +0000 (UTC) X-FDA: 82154447298.28.0A1456F Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf11.hostedemail.com (Postfix) with ESMTP id 73B0C4000B for ; Fri, 24 May 2024 20:36:27 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=NUxhJpQH; spf=pass (imf11.hostedemail.com: domain of akpm@linux-foundation.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1716582987; 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=3EvraVcsWhY6lpyrEFPAoNaTUouWwsLjYqzsS7vqf2Q=; b=NZ1UsQwrJ6fMbhzh04p3ROMSJnd4JxaG/29F5uVLWhVka9VkiSfEjaCEL6iVybw7ff6e78 r6BAZzcwbT+UIPVAxTkHWN6maNEMwNjkc9ItSHdhYEPePOBkvbPlb8qEBNqwltMYwfJYyP MuRtq1z+R2kj3xPBxdQOaDnnVzWhpR4= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=NUxhJpQH; spf=pass (imf11.hostedemail.com: domain of akpm@linux-foundation.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1716582987; a=rsa-sha256; cv=none; b=VbhyZ0ILTTBIGq5dCq0+KPQdROZhe96PtuFJl97pr3mmH9L8fEjYKsRThksFyp6NOTp99P bDt6i82I6cGwenurnfHGJFKJBanUl0DtBKnHmu98J+eoRvYHopAm0lFObwyavNBRXIzHHQ mgp6C9ZRmYQ2nPEuqwDYJFz5ngQAcYk= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 63E1E62B7F; Fri, 24 May 2024 20:36:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1DFC6C2BBFC; Fri, 24 May 2024 20:36:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1716582986; bh=VQHmXG+j7PIHbzuECBnhhjZXJ0/jfoHRjIEPxqgUvcc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=NUxhJpQHXzT8PNJ83TzM/Wyp7kA/0w4J+WQYT+Wu4k0sa3m8G8xl3BNOMp37SP9HV 0tgzjDAHHTu1wYhzBuKAm1A4vXPKn0utxjLaLRdE0uImOu002lRbNx60dcMIMxqcLP MkK89kBjNagawGOzBfTC1B9llYq6VCsrbxXyANoc= Date: Fri, 24 May 2024 13:36:24 -0700 From: Andrew Morton To: David Rientjes Cc: Sourav Panda , corbet@lwn.net, gregkh@linuxfoundation.org, rafael@kernel.org, mike.kravetz@oracle.com, muchun.song@linux.dev, rppt@kernel.org, david@redhat.com, rdunlap@infradead.org, chenlinxuan@uniontech.com, yang.yang29@zte.com.cn, tomas.mudrunka@gmail.com, bhelgaas@google.com, ivan@cloudflare.com, pasha.tatashin@soleen.com, yosryahmed@google.com, hannes@cmpxchg.org, shakeelb@google.com, kirill.shutemov@linux.intel.com, wangkefeng.wang@huawei.com, adobriyan@gmail.com, Vlastimil Babka , "Liam R. Howlett" , surenb@google.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, Matthew Wilcox , weixugc@google.com Subject: Re: [PATCH v12] mm: report per-page metadata information Message-Id: <20240524133624.9d9e3935a0c99700b67cee5f@linux-foundation.org> In-Reply-To: <1e1b89af-3b7a-7400-cfd7-d22a101955de@google.com> References: <20240512010611.290464-1-souravpanda@google.com> <45fb4c94-dd77-94c3-f08f-81bf31e6d6d2@google.com> <1e1b89af-3b7a-7400-cfd7-d22a101955de@google.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Stat-Signature: qt5p86xtifor3y9ok6qdbfnnztj6ne14 X-Rspamd-Queue-Id: 73B0C4000B X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1716582987-858415 X-HE-Meta: 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 govnQtOV nIbKF9nwQl5vzNDYo2oPYiJRmBB+y+f3/6D1QJTXr97VG+/i0U3l7OMXP78+9FDHabYkmZqShimbMyQVIQJAQQqWwiauTIWqHU+nvfLIgb6gBpnnxKNcxY8impmJxsCDC6RrDMve4l0G1E4RIh4imspRRSJq9lCBl4Z4KaH21BWmfvsPxzN6qoKo8YLLqTToWCO0JNP5mwIY9ezQdIK8OE7ECnkwF9QbK9glpgI4ujg560r/52v/OqBcBgbYUFs1PuwUY4+IpgC458qkT78ChBKCLe0XPYMp1IsPj 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 Fri, 24 May 2024 13:00:06 -0700 (PDT) David Rientjes wrote: > This would be a very useful extension to be able to provide observability > of per-page metadata overhead and the impact of things like HVO on the > overall footprint. Today, we don't have observability for this memory > overhead. > > Andrew, anything else that can be addressed before this is eligible for > staging in MM unstable? I've asked Sourav to prepare a v13, largely to see if we can get a few more eyeballs onto this.