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 2F191C761A6 for ; Mon, 3 Apr 2023 04:13:20 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B64D46B0072; Mon, 3 Apr 2023 00:13:19 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B155A6B0074; Mon, 3 Apr 2023 00:13:19 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 9DD2B6B0075; Mon, 3 Apr 2023 00:13:19 -0400 (EDT) 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 8ED086B0072 for ; Mon, 3 Apr 2023 00:13:19 -0400 (EDT) Received: from smtpin30.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 4E2FC1A0366 for ; Mon, 3 Apr 2023 04:13:19 +0000 (UTC) X-FDA: 80638760118.30.AE4B1DA Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf26.hostedemail.com (Postfix) with ESMTP id 9EDED140003 for ; Mon, 3 Apr 2023 04:13:17 +0000 (UTC) Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=SjkWhVfE; spf=none (imf26.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1680495197; 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=JCaTQDH69Gr7URRj8QyibVsxSrgDVKe91Qxc5yJkGbU=; b=LzCFAb7rkqdGRY5Q5Hwo/PRhpgakdWOFtDQkK9i1mSR6N3K0DlgpdQ72FE061MzOqTNXFb RNPZa79GaI+bygs+7r6TcS+/z0gkxEwimtmctoihHaj7xOpSz9O42cVIrLEePzf87AHqbI gHKp7Zw0Qeavb6osPmfdYj6woARSC+c= ARC-Authentication-Results: i=1; imf26.hostedemail.com; dkim=pass header.d=infradead.org header.s=casper.20170209 header.b=SjkWhVfE; spf=none (imf26.hostedemail.com: domain of willy@infradead.org has no SPF policy when checking 90.155.50.34) smtp.mailfrom=willy@infradead.org; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1680495197; a=rsa-sha256; cv=none; b=6X5vvO8rFsOouhGoU3BtpmS8hdBnYp6L8ZoMMnuyOs4RFhANZ/sFA9/m0RyEvYgw2oQl9P /aurBrSCwf9KB3+yEFWAXTluXr98rJN0mg2fqFlyLiP47BgnYMzT5KOfBCKDdkjwAuBEAu eQbMy4VbQkBuPeGZ0bx76WIe5F8Z5QM= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Transfer-Encoding: Content-Type:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Sender:Reply-To:Content-ID:Content-Description; bh=JCaTQDH69Gr7URRj8QyibVsxSrgDVKe91Qxc5yJkGbU=; b=SjkWhVfETbkBwIiO3wuXoyAZcx hcJd/IM2FXNh9RH8xcEz1SCvIM76JjdQ8pxXeaaXa4gP7+8Oa9NA9uJHjMuV/k5Cd0HxapJhOTAsA aYMDeICvhSMEMLzKLFEjS3D5Ul/lMoYYBm+DzwT7C7D75cc3MjVgzFDpvMzHW83H/59XVWQRnO1eG nAmLZ8WYVmeTLZsF0cKznYrp+YmX3NyzShe9nF6OZeYBqcjD9BGOyVv3zyRUBBCF3ohdpBat44eku CC24y6hpszrJ3dpsj0kwDP03Gloh6jbb8ROX+oHYPlKh+DlPBPdcW4czkJpYQTPKkmZv1MK+aGzHX ziCVIu1Q==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pjBZ5-00DmSH-Ru; Mon, 03 Apr 2023 04:13:07 +0000 Date: Mon, 3 Apr 2023 05:13:07 +0100 From: Matthew Wilcox To: "Fabio M. De Francesco" Cc: =?utf-8?B?6YOt6L6J?= , Vlastimil Babka , Linux-MM , LKML , patches@lists.linux.dev Subject: Re: [PATCH] mm: remove all the slab allocators Message-ID: References: <20230401094658.11146-1-vbabka@suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 9EDED140003 X-Stat-Signature: rc4bxw7a4h3mdmqms6qkn1u9pih95oh5 X-Rspam-User: X-HE-Tag: 1680495197-884221 X-HE-Meta: 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 gIWSRQ1d 6JhMy0wH8/Kqoqb1uAIQv+xJ/qctNEEf4ZCk2vwMQzEkGtq1HZ5TVGt3WCki/jzl895K6ttZq7kRhaPWKwOIrxA+lkH3FYY1qbsri7Bt2wa74zuOG9MRjsFaQXJi7dODAvp1jUweiw2R4UhWC4cEkPzlB8wLU17S2eTd2rv8SMP3qKdiIMqYN6x7OF6Nxw6cMs2quBgVBgBQGDgmJn/Qg2qnrVTgNBZYYz8nLnG0cKd2Ke01gUABkf3qL+Gu7ALLrzyFH 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: On Mon, Apr 03, 2023 at 05:51:42AM +0200, Fabio M. De Francesco wrote: > On Sun, 2 Apr 2023, 13:04 Matthew Wilcox, wrote: > > > On Sun, Apr 02, 2023 at 05:09:14PM +0800, 郭辉 wrote: > > > On 4/1/23 5:46 PM, Vlastimil Babka wrote: > > > > As the SLOB removal is on track and the SLAB removal is planned, I have > > > > realized - why should we stop there and not remove also SLUB? What's a > > > > slab allocator good for in 2023? The RAM sizes are getting larger and > > > > the modules cheaper [1]. The object constructor trick was perhaps > > > > interesting in 1994, but not with contemporary CPUs. So all the slab > > > > allocator does today is just adding an unnecessary layer of complexity > > > > over the page allocator. > > > > > > The slab allocator is very core and very important to the Linux kernel. > > > After the patch is merged into the mainline, it will have a very profound > > > impact on the development of the Linux kernel. > > > > https://en.wikipedia.org/wiki/April_Fools%27_Day > > > Wow! > > The most interesting implication of this "patch" is that you noticed that > some people may actually need the link above to be able to distinguish > between foolishness and reality... As the article says, this is a Western tradition, and we shouldn't assume that somebody from (I assume) China would be familiar with this particular foolishness ;-)