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 DC41BC00140 for ; Mon, 8 Aug 2022 22:09:37 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7072E6B0071; Mon, 8 Aug 2022 18:09:37 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 6B5BE6B0072; Mon, 8 Aug 2022 18:09:37 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 57F758E0001; Mon, 8 Aug 2022 18:09:37 -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 448386B0071 for ; Mon, 8 Aug 2022 18:09:37 -0400 (EDT) Received: from smtpin01.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id F2239AABF1 for ; Mon, 8 Aug 2022 22:09:36 +0000 (UTC) X-FDA: 79777817952.01.713E4EF Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by imf06.hostedemail.com (Postfix) with ESMTP id 23BE6180150 for ; Mon, 8 Aug 2022 22:09:34 +0000 (UTC) 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 ams.source.kernel.org (Postfix) with ESMTPS id 7291DB80EED; Mon, 8 Aug 2022 22:09:33 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 04ED3C433D6; Mon, 8 Aug 2022 22:09:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1659996572; bh=UKW4itK7Gf22fywbhWxb6TeJUkQC+BbHXMF3qbl8FeQ=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=wi8TobbC0QU1LcCHsqlC+NhJVTVSD7mwP/YImEtJjBPjt38WKlopoCsvdoS7VE/Eg vP5HjH+sW/JsrScQTjLcaD+Ir4lu72emFwNDiulrIjYw81bLgdwJuZFAuekKfVtPsv aCevBrJbKxWbHR3R1iH/bZTOTKq7x4/ash9X6Qlk= Date: Mon, 8 Aug 2022 15:09:31 -0700 From: Andrew Morton To: Rik van Riel Cc: linux-mm@kvack.org, kernel-team@fb.com, Matthew Wilcox Subject: Re: [PATCH] mm: align larger anonymous mappings on THP boundaries Message-Id: <20220808150931.49e9940bfc350227fc63b420@linux-foundation.org> In-Reply-To: <20220808164658.5079a9a0@imladris.surriel.com> References: <20220808164658.5079a9a0@imladris.surriel.com> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.33; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1659996575; a=rsa-sha256; cv=none; b=sSy23oaapLpJvHyuvdFNFnWhfCnXwMC3pXxcBqbAt+4fm/HWhLHI2x0EvUs9MqFfdfE7Af PFLq8Mle8DiJ8I3dn+NCMsPru40uaL0ajDEQRYUlRbx/ayMWY/eAreqqC7abaIGEixDfpR TToJd9cGOrtUD3/K/PoiYLr/p36hvMI= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=wi8TobbC; spf=pass (imf06.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.68.75 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=1659996575; 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=OJf1v5ODEZLkwZwd0qp4S6lp4wb2vtRTvks9X1YLXFA=; b=xzvFgzZ2Fz5DWazRDWa1+5e5Yml+64JzjS+0xYzEopYQvQewP0WuiAKd4KDkwjhFkH3lnn F52UqxhF2SN736CPsU7+PhF6j4MmAy+Yt6+qTr1N1ai6XGixC53m1KzP/1hjV9/seooQhc 7hNBM7TFYR3o+6UO/usDNfH/tsNcRyk= X-Stat-Signature: kr4py8z878xffsegwswm366jydytchhd X-Rspamd-Queue-Id: 23BE6180150 Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=wi8TobbC; spf=pass (imf06.hostedemail.com: domain of akpm@linux-foundation.org designates 145.40.68.75 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1659996574-302864 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, 8 Aug 2022 16:46:58 -0400 Rik van Riel wrote: > Align larger anonymous memory mappings on THP boundaries by > going through thp_get_unmapped_area if THPs are enabled for > the current process. > > With this patch, larger anonymous mappings are now THP aligned > when checking in /proc/PID/maps, but only when THP is enabled > for that process. > What are the runtime effects of this change?