From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755420Ab3EHXjS (ORCPT ); Wed, 8 May 2013 19:39:18 -0400 Received: from LGEMRELSE6Q.lge.com ([156.147.1.121]:61069 "EHLO LGEMRELSE6Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752578Ab3EHXjR (ORCPT ); Wed, 8 May 2013 19:39:17 -0400 X-AuditID: 9c930179-b7bb6ae000001131-dc-518ae219bc6c From: Minchan Kim To: Andrew Morton Cc: Michael Kerrisk , Rik van Riel , Dave Hansen , Namhyung Kim , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Minchan Kim Subject: [PATCH v4 6/6] add documentation about reclaim knob on proc.txt Date: Thu, 9 May 2013 08:39:02 +0900 Message-Id: <1368056342-30836-7-git-send-email-minchan@kernel.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1368056342-30836-1-git-send-email-minchan@kernel.org> References: <1368056342-30836-1-git-send-email-minchan@kernel.org> X-Brightmail-Tracker: AAAAAA== Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds stuff about new reclaim field in proc.txt Acked-by: Rob Landley Signed-off-by: Minchan Kim --- Documentation/filesystems/proc.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 488c094..ee4cef1 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -136,6 +136,7 @@ Table 1-1: Process specific entries in /proc maps Memory maps to executables and library files (2.4) mem Memory held by this process root Link to the root directory of this process + reclaim Reclaim pages in this process stat Process status statm Process memory status information status Process status in human readable form @@ -489,6 +490,25 @@ To clear the soft-dirty bit Any other value written to /proc/PID/clear_refs will have no effect. +The file /proc/PID/reclaim is used to reclaim pages in this process. +To reclaim file-backed pages, + > echo file > /proc/PID/reclaim + +To reclaim anonymous pages, + > echo anon > /proc/PID/reclaim + +To reclaim all pages, + > echo all > /proc/PID/reclaim + +Also, you can specify address range of process so part of address space +will be reclaimed. The format is following as + > echo addr size-byte > /proc/PID/reclaim + +NOTE: addr should be page-aligned. + +Below is example which try to reclaim 2M from 0x100000. + > echo 0x100000 2M > /proc/PID/reclaim + The /proc/pid/pagemap gives the PFN, which can be used to find the pageflags using /proc/kpageflags and number of times a page is mapped using /proc/kpagecount. For detailed explanation, see Documentation/vm/pagemap.txt. -- 1.8.2.1