From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753035AbcGMIzn (ORCPT ); Wed, 13 Jul 2016 04:55:43 -0400 Received: from outbound-smtp02.blacknight.com ([81.17.249.8]:57624 "EHLO outbound-smtp02.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752754AbcGMIze (ORCPT ); Wed, 13 Jul 2016 04:55:34 -0400 Date: Wed, 13 Jul 2016 09:55:16 +0100 From: Mel Gorman To: Johannes Weiner Cc: Andrew Morton , Linux-MM , Rik van Riel , Vlastimil Babka , Minchan Kim , Joonsoo Kim , LKML Subject: Re: [PATCH 18/34] mm: rename NR_ANON_PAGES to NR_ANON_MAPPED Message-ID: <20160713085516.GI9806@techsingularity.net> References: <1467970510-21195-1-git-send-email-mgorman@techsingularity.net> <1467970510-21195-19-git-send-email-mgorman@techsingularity.net> <20160712145801.GJ5881@cmpxchg.org> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-15 Content-Disposition: inline In-Reply-To: <20160712145801.GJ5881@cmpxchg.org> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 12, 2016 at 10:58:01AM -0400, Johannes Weiner wrote: > On Fri, Jul 08, 2016 at 10:34:54AM +0100, Mel Gorman wrote: > > NR_FILE_PAGES is the number of file pages. > > NR_FILE_MAPPED is the number of mapped file pages. > > NR_ANON_PAGES is the number of mapped anon pages. > > > > This is unhelpful naming as it's easy to confuse NR_FILE_MAPPED and > > NR_ANON_PAGES for mapped pages. This patch renames NR_ANON_PAGES so we > > have > > > > NR_FILE_PAGES is the number of file pages. > > NR_FILE_MAPPED is the number of mapped file pages. > > NR_ANON_MAPPED is the number of mapped anon pages. > > That looks wrong to me. The symmetry is between NR_FILE_PAGES and > NR_ANON_PAGES. NR_FILE_MAPPED is merely elaborating on the mapped > subset of NR_FILE_PAGES, something which isn't necessary for anon > pages as they're always mapped. How strongly do you feel about reverting it as later patches would cause lots of conflicts. Obviously I found the new names clearer but I was thinking a lot at the time about mapped vs unmapped due to looking closely at both reclaim and [f|m]advise functions at the time. I found it mildly irksome to switch between the semantics of file/anon when looking at the vmstat updates. -- Mel Gorman SUSE Labs