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 X-Spam-Level: X-Spam-Status: No, score=-2.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 401CBC47404 for ; Fri, 4 Oct 2019 23:49:08 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1AD70215EA for ; Fri, 4 Oct 2019 23:49:08 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1AD70215EA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id A99466B0006; Fri, 4 Oct 2019 19:49:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A49536B0008; Fri, 4 Oct 2019 19:49:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 95E876B000A; Fri, 4 Oct 2019 19:49:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0100.hostedemail.com [216.40.44.100]) by kanga.kvack.org (Postfix) with ESMTP id 704866B0006 for ; Fri, 4 Oct 2019 19:49:07 -0400 (EDT) Received: from smtpin01.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with SMTP id 0AF7D824376A for ; Fri, 4 Oct 2019 23:49:07 +0000 (UTC) X-FDA: 76007745534.01.anger58_89b729ee52a48 X-HE-Tag: anger58_89b729ee52a48 X-Filterd-Recvd-Size: 2279 Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by imf36.hostedemail.com (Postfix) with ESMTP for ; Fri, 4 Oct 2019 23:49:06 +0000 (UTC) X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 04 Oct 2019 16:49:04 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,258,1566889200"; d="scan'208";a="205963748" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by fmsmga001.fm.intel.com with ESMTP; 04 Oct 2019 16:49:03 -0700 Date: Sat, 5 Oct 2019 07:48:45 +0800 From: Wei Yang To: Matthew Wilcox Cc: Wei Yang , akpm@linux-foundation.org, kirill.shutemov@linux.intel.com, jglisse@redhat.com, mike.kravetz@oracle.com, riel@surriel.com, khlebnikov@yandex-team.ru, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm/rmap.c: reuse mergeable anon_vma as parent when fork Message-ID: <20191004234845.GB15415@richard> Reply-To: Wei Yang References: <20191004160632.30251-1-richardw.yang@linux.intel.com> <20191004161120.GI32665@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191004161120.GI32665@bombadil.infradead.org> User-Agent: Mutt/1.9.4 (2018-02-28) 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 Fri, Oct 04, 2019 at 09:11:20AM -0700, Matthew Wilcox wrote: >On Sat, Oct 05, 2019 at 12:06:32AM +0800, Wei Yang wrote: >> After this change, kernel build test reduces 20% anon_vma allocation. > >But does it have any effect on elapsed time or peak memory consumption? Do the same kernel build test and record time: Origin real 2m50.467s user 17m52.002s sys 1m51.953s real 2m48.662s user 17m55.464s sys 1m50.553s real 2m51.143s user 17m59.687s sys 1m53.600s Patched real 2m43.733s user 17m25.705s sys 1m41.791s real 2m47.146s user 17m47.451s sys 1m43.474s real 2m45.763s user 17m38.230s sys 1m42.102s For time in sys, it reduced 8.5%. -- Wei Yang Help you, Help me