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 88E33C77B7A for ; Thu, 18 May 2023 18:46:49 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 10AE2900004; Thu, 18 May 2023 14:46:49 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 0BB34900003; Thu, 18 May 2023 14:46:49 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EEC0C900004; Thu, 18 May 2023 14:46:48 -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 E06E9900003 for ; Thu, 18 May 2023 14:46:48 -0400 (EDT) Received: from smtpin19.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id A107F1C715C for ; Thu, 18 May 2023 18:46:48 +0000 (UTC) X-FDA: 80804257296.19.C5153AC Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf25.hostedemail.com (Postfix) with ESMTP id C6336A000F for ; Thu, 18 May 2023 18:46:46 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf25.hostedemail.com: domain of cmarinas@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=cmarinas@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1684435607; 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; bh=a9Wix4Xxl7TEiURIuk0+i7kLypHhrVAdW8VwS8KIKQ0=; b=rDrXgnrobWyjOFGJfZA4mwh9ikXAlENuFAavDi1rDNS9os64WWkYJXq5zvbaRFjGsMUgyX voyuXoF/8Oob2Fi2aEJSshgI+4DvHb9ra0R7pn4OXaek2eh62vgc8uvlfd87S9jzZsKLfx Q4BtVsk8Z9Vi8Ptf2j/lhuTcvr5JiD4= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=none; dmarc=fail reason="SPF not aligned (relaxed), No valid DKIM" header.from=arm.com (policy=none); spf=pass (imf25.hostedemail.com: domain of cmarinas@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=cmarinas@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1684435607; a=rsa-sha256; cv=none; b=Vsb5YI/wTlHy16bPhofEkFkVI/ODKTuPirXm3PouYHL8Z7ZYFJ1pCvqqTAJEVgS2709s9+ xwUsRGbG3NDp2fMMMPuxlcFoiKG/P8Ggq8uIffDo7C7M6OzXv4g3uDV/mHK7XYoGtTqGaj HqrFqnWhr/A+pYIpUvyXH5hH12idKEw= Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 553096199F; Thu, 18 May 2023 18:46:45 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 543F6C433D2; Thu, 18 May 2023 18:46:41 +0000 (UTC) Date: Thu, 18 May 2023 19:46:38 +0100 From: Catalin Marinas To: Linus Torvalds Cc: Arnd Bergmann , Christoph Hellwig , Greg Kroah-Hartman , Will Deacon , Marc Zyngier , Andrew Morton , Herbert Xu , Ard Biesheuvel , Isaac Manjarres , Saravana Kannan , Alasdair Kergon , Daniel Vetter , Joerg Roedel , Mark Brown , Mike Snitzer , "Rafael J. Wysocki" , Robin Murphy , linux-mm@kvack.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v4 00/15] mm, dma, arm64: Reduce ARCH_KMALLOC_MINALIGN to 8 Message-ID: References: <20230518173403.1150549-1-catalin.marinas@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-Rspam-User: X-Stat-Signature: 93q1xo8t6su88dn71t7nsay8k6nkk85f X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: C6336A000F X-HE-Tag: 1684435606-257657 X-HE-Meta: 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 zdw2yCy2 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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: On Thu, May 18, 2023 at 10:56:24AM -0700, Linus Torvalds wrote: > On Thu, May 18, 2023 at 10:34 AM Catalin Marinas > wrote: > > > > That's the fourth version of the series reducing the kmalloc() minimum > > alignment on arm64 to 8 (from 128). > > Lovely. On my M2 Macbook air, I right now have about 24MB in the > kmalloc-128 bucket, and most of it is presumably just 16 byte > allocations (judging by my x86-64 slabinfo). > > I guess it doesn't really matter when I have 16GB in the machine, but > this has annoyed me for a while. > > It feels like this is ready for 6.5, no? >From an implementation approach perspective, I definitely target 6.5. But I need help with testing this, especially the iommu bits (can buy Robin some beers ;)). -- Catalin