From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758458AbZFOLPF (ORCPT ); Mon, 15 Jun 2009 07:15:05 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753773AbZFOLOo (ORCPT ); Mon, 15 Jun 2009 07:14:44 -0400 Received: from gir.skynet.ie ([193.1.99.77]:45682 "EHLO gir.skynet.ie" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751946AbZFOLOn (ORCPT ); Mon, 15 Jun 2009 07:14:43 -0400 From: Mel Gorman To: Mel Gorman , Andrew Morton , KOSAKI Motohiro Cc: Rik van Riel , Christoph Lameter , Wu Fengguang , linuxram@us.ibm.com, linux-mm , LKML Subject: [PATCH 2/2] mm: Fix documentation of min_unmapped_ratio Date: Mon, 15 Jun 2009 12:14:42 +0100 Message-Id: <1245064482-19245-3-git-send-email-mel@csn.ul.ie> X-Mailer: git-send-email 1.5.6.5 In-Reply-To: <1245064482-19245-1-git-send-email-mel@csn.ul.ie> References: <1245064482-19245-1-git-send-email-mel@csn.ul.ie> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Kosaki Motohiro pointed out that the documentation for min_unmapped_ratio no longer matches the implementation. This patch updates the documentation. This patch can be merged with vmscan-properly-account-for-the-number-of-page-cache-pages-zone_reclaim-can-re claim.patch . Signed-off-by: Mel Gorman --- Documentation/sysctl/vm.txt | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 0ea5adb..c4de635 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -315,10 +315,14 @@ min_unmapped_ratio: This is available only on NUMA kernels. -A percentage of the total pages in each zone. Zone reclaim will only -occur if more than this percentage of pages are file backed and unmapped. -This is to insure that a minimal amount of local pages is still available for -file I/O even if the node is overallocated. +This is a percentage of the total pages in each zone. Zone reclaim will +only occur if more than this percentage of pages are in a state that +zone_reclaim_mode allows to be reclaimed. + +If zone_reclaim_mode has the value 4 OR'd, then the percentage is compared +against all file-backed unmapped pages including swapcache pages and tmpfs +files. Otherwise, only unmapped pages backed by normal files but not tmpfs +files and similar are considered. The default is 1 percent. -- 1.5.6.5