From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f72.google.com (mail-oi0-f72.google.com [209.85.218.72]) by kanga.kvack.org (Postfix) with ESMTP id 762E56B007E for ; Thu, 16 Jun 2016 08:27:40 -0400 (EDT) Received: by mail-oi0-f72.google.com with SMTP id a64so79088801oii.1 for ; Thu, 16 Jun 2016 05:27:40 -0700 (PDT) Received: from mga14.intel.com (mga14.intel.com. [192.55.52.115]) by mx.google.com with ESMTP id g80si5861379pfk.4.2016.06.16.05.27.39 for ; Thu, 16 Jun 2016 05:27:39 -0700 (PDT) Date: Thu, 16 Jun 2016 15:27:35 +0300 From: "Kirill A. Shutemov" Subject: Re: [PATCH 1/2] Revert "mm: make faultaround produce old ptes" Message-ID: <20160616122735.GB108167@black.fi.intel.com> References: <1465893750-44080-1-git-send-email-kirill.shutemov@linux.intel.com> <1465893750-44080-2-git-send-email-kirill.shutemov@linux.intel.com> <20160616122001.GJ6836@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20160616122001.GJ6836@dhcp22.suse.cz> Sender: owner-linux-mm@kvack.org List-ID: To: Michal Hocko Cc: Linus Torvalds , Andrew Morton , Rik van Riel , Mel Gorman , "Huang, Ying" , Minchan Kim , Vinayak Menon , Dave Hansen , linux-kernel@vger.kernel.org, linux-mm@kvack.org On Thu, Jun 16, 2016 at 02:20:02PM +0200, Michal Hocko wrote: > On Tue 14-06-16 11:42:29, Kirill A. Shutemov wrote: > > This reverts commit 5c0a85fad949212b3e059692deecdeed74ae7ec7. > > > > The commit causes ~6% regression in unixbench. > > Is the regression fully explained? My understanding from the email > thread is that this is suspiciously too high. It is not like I would > be against the revert but having an explanation would be really > appreciated. My understanding is that it's overhead on setting accessed bit: http://lkml.kernel.org/r/20160613125248.GA30109@black.fi.intel.com -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org