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 E14C0C35FFF for ; Fri, 21 Mar 2025 05:14:55 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 8BBE6280002; Fri, 21 Mar 2025 01:14:53 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 86A61280001; Fri, 21 Mar 2025 01:14:53 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 70CFC280002; Fri, 21 Mar 2025 01:14:53 -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 54EBA280001 for ; Fri, 21 Mar 2025 01:14:53 -0400 (EDT) Received: from smtpin02.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id CFB1F161FF7 for ; Fri, 21 Mar 2025 05:14:54 +0000 (UTC) X-FDA: 83244393708.02.2DDB048 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) by imf14.hostedemail.com (Postfix) with ESMTP id 3D926100005 for ; Fri, 21 Mar 2025 05:14:53 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=1wmiI9+V; spf=none (imf14.hostedemail.com: domain of BATV+29b50c529b9140e130ad+7880+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+29b50c529b9140e130ad+7880+infradead.org+hch@bombadil.srs.infradead.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1742534093; 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=fIC/SAXuaviF4kGty41Kn3ZZ26v8zIm5FHzMRtfkfFc=; b=09BOaB5esmylTUvHqTQdi82DnF+yCj8bU1EIP3zhlugIDK0yxb1K701wnlY6cy4aWJ7ooo XrO6eUzNGs+/LTehrLWVBjCEE0fS5rW+BmWow+NbX6wCapsGXupYjA+SFmzFAvyu3vCTP9 fRckMASME0+5tX3v6BgCWRm/ojJCKdE= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1742534093; a=rsa-sha256; cv=none; b=sIJe+fT7Bj+O2+BovKErlFCACBRzcOOT0juVaemmSpAiYK0J9zX7T/pJryukOBqsLfgaxC 6Y2gDKQBrIgWsuGoNcgxZBAWBwtFAxn5mBLrERLP2fPVhoGRzrdCiiq6WSFj4v5aKdWh3M 4+qwUJxAAFSW3gdHSV1yceXPPi7sOLY= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=infradead.org header.s=bombadil.20210309 header.b=1wmiI9+V; spf=none (imf14.hostedemail.com: domain of BATV+29b50c529b9140e130ad+7880+infradead.org+hch@bombadil.srs.infradead.org has no SPF policy when checking 198.137.202.133) smtp.mailfrom=BATV+29b50c529b9140e130ad+7880+infradead.org+hch@bombadil.srs.infradead.org; dmarc=none DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=fIC/SAXuaviF4kGty41Kn3ZZ26v8zIm5FHzMRtfkfFc=; b=1wmiI9+VZjGjXVJSYgYQgrg6N1 t5dpCQ9cWL8kFMKwc19IlHoDP7CaQdDWJhrB8p7UjT/s0y+sKqjIWWZfy/VHNp3CoCXALSc7yKnbR iI3qfxX9AFYNvdMABaL+ZQ3Wq94cBUX/4ZGjDQpEEqxbCkNaBG9X47Lx3OXVA+GBnEAhNjC+DC1lS 9h4zNL/fx2G2f6uOLH+8ehqAH5Byvo0FHJOm32VV0yA8YncZ/7GRtxSoOJwwDOOogrYawcbuA9HrH c90vZ+beiRPDIl915nDJC97Vd1M1BlHuVnb/zBYhDVi4KK80b5b+/UQQCW5v/Dysa3Uuq8pCi69Sc s79lkjwA==; Received: from hch by bombadil.infradead.org with local (Exim 4.98 #2 (Red Hat Linux)) id 1tvUiR-0000000DsQw-3ibf; Fri, 21 Mar 2025 05:14:43 +0000 Date: Thu, 20 Mar 2025 22:14:43 -0700 From: Christoph Hellwig To: Suren Baghdasaryan Cc: akpm@linux-foundation.org, willy@infradead.org, david@redhat.com, vbabka@suse.cz, lorenzo.stoakes@oracle.com, liam.howlett@oracle.com, alexandru.elisei@arm.com, peterx@redhat.com, hannes@cmpxchg.org, mhocko@kernel.org, m.szyprowski@samsung.com, iamjoonsoo.kim@lge.com, mina86@mina86.com, axboe@kernel.dk, viro@zeniv.linux.org.uk, brauner@kernel.org, hch@infradead.org, jack@suse.cz, hbathini@linux.ibm.com, sourabhjain@linux.ibm.com, ritesh.list@gmail.com, aneesh.kumar@kernel.org, bhelgaas@google.com, sj@kernel.org, fvdl@google.com, ziy@nvidia.com, yuzhao@google.com, minchan@kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Minchan Kim Subject: Re: [RFC 2/3] mm: introduce GCMA Message-ID: References: <20250320173931.1583800-1-surenb@google.com> <20250320173931.1583800-3-surenb@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250320173931.1583800-3-surenb@google.com> X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 3D926100005 X-Stat-Signature: bhf9fxznbkutbbkh5snfwftjeb9y9yjn X-HE-Tag: 1742534093-429275 X-HE-Meta: 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 YOjxx9hC 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 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, Mar 20, 2025 at 10:39:30AM -0700, Suren Baghdasaryan wrote: > From: Minchan Kim > > This patch introduces GCMA (Guaranteed Contiguous Memory Allocator) > cleacache backend which reserves some amount of memory at the boot > and then donates it to store clean file-backed pages in the cleancache. > GCMA aims to guarantee contiguous memory allocation success as well as > low and deterministic allocation latency. > > Notes: > Originally, the idea was posted by SeongJae Park and Minchan Kim [1]. > Later Minchan reworked it to be used in Android as a reference for > Android vendors to use [2]. That is not a very good summay. It needs to explain how you ensure that the pages do stay clean forever.