Received: by 2002:a5b:505:0:0:0:0:0 with SMTP id o5csp2098542ybp; Sat, 5 Oct 2019 05:41:22 -0700 (PDT) X-Google-Smtp-Source: APXvYqzbsi58mFz7qsuAvO0hIrIPX2g3S4SbqXpVWbK5+qYQc8kFXR/rhGiysnWXBBkfhZglae1c X-Received: by 2002:a05:6402:709:: with SMTP id w9mr20200574edx.85.1570279282707; Sat, 05 Oct 2019 05:41:22 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1570279282; cv=none; d=google.com; s=arc-20160816; b=IdA0g4ZriWKPnEYZLB361T//YkeWJYa1CT53bBClh8EzMBVkYnUVXJ3xtLidNDJsUS FlauTThuhxGko49b4QJC25Do/ZzSZ5xwsZRgio8BRsK66uKwStfA9OPAzP5CZyzPmsFY 49oUjr17iWPHp+AT8QplUjlkuBQy6PMzlgSoa5tr0YufLhqb661xk+fIafKIrufSqHqQ JtttGh9GsXQf7pGNDwdR3+6E0VbdwmUgN8NUaqJuizoXA5XSMGTHaY+ImJapiKPQNchy 71PFwknw7O5JpfFGyLsi8DQ7+L49hw3NwIu7GcleDMkJ/hNWbVraBZ3FMM2cJNKU30+j 34wA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:user-agent:in-reply-to :content-disposition:mime-version:references:reply-to:message-id :subject:cc:to:from:date; bh=jU7H/xlVH327zlTs2CRXqJ+HVqpQynPf+Wd+g0Kd4No=; b=giBMu5x7a9jTHNaMh35In02zjYBhzUpw4qqQIaPj3/QAxJUGMe+cRbv2RU1Ed8kUVV Ou19v/iIKHYapJEV79f7YNt8jAKg+wpZlFo1P5ka9hYWnEjDSkCtNeGJyzVPbVdYK/2B 49Z7KGLv+uAORUNN7fPVqS7IfBmnkQmMpNlflH2Ro1MXVOHVjRuhrc4P1TVYEKxX1Dwo YwojQW+/IEgtnlWppB4BZ9jxP3FI4/HgJU+FCdhFYtKHCPcNHfpLt/KJIc6ltwBCBAeb n6fW5x0m2YmcCdZOaO4hmZxyziDEzbCxxaNkup+/7YM+6euan7cgXwEYtm66GuXQrm9g ZT8w== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id b47si5593820edc.45.2019.10.05.05.40.57; Sat, 05 Oct 2019 05:41:22 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728282AbfJEMfc (ORCPT + 99 others); Sat, 5 Oct 2019 08:35:32 -0400 Received: from mga03.intel.com ([134.134.136.65]:2630 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727983AbfJEMfc (ORCPT ); Sat, 5 Oct 2019 08:35:32 -0400 X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 05 Oct 2019 05:35:29 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.67,260,1566889200"; d="scan'208";a="222425250" Received: from richard.sh.intel.com (HELO localhost) ([10.239.159.54]) by fmsmga002.fm.intel.com with ESMTP; 05 Oct 2019 05:35:25 -0700 Date: Sat, 5 Oct 2019 20:35:07 +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: <20191005123507.GA7222@richard> Reply-To: Wei Yang References: <20191004160632.30251-1-richardw.yang@linux.intel.com> <20191004161120.GI32665@bombadil.infradead.org> <20191004234845.GB15415@richard> <20191005011554.GQ32665@bombadil.infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191005011554.GQ32665@bombadil.infradead.org> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 04, 2019 at 06:15:54PM -0700, Matthew Wilcox wrote: >On Sat, Oct 05, 2019 at 07:48:45AM +0800, Wei Yang wrote: >> 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%. > >That's compelling! Yep, looks good :-) -- Wei Yang Help you, Help me