From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758771Ab3DYBHr (ORCPT ); Wed, 24 Apr 2013 21:07:47 -0400 Received: from LGEMRELSE6Q.lge.com ([156.147.1.121]:58769 "EHLO LGEMRELSE6Q.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758752Ab3DYBHn (ORCPT ); Wed, 24 Apr 2013 21:07:43 -0400 X-AuditID: 9c930179-b7b5bae0000069d1-5b-517881dc4f63 From: Minchan Kim To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Michael Kerrisk , Rik van Riel , Dave Hansen , Namhyung Kim , Minchan Kim Subject: [PATCH v3 6/6] add documentation about reclaim knob on proc.txt Date: Thu, 25 Apr 2013 10:07:22 +0900 Message-Id: <1366852043-12511-7-git-send-email-minchan@kernel.org> X-Mailer: git-send-email 1.8.2 In-Reply-To: <1366852043-12511-1-git-send-email-minchan@kernel.org> References: <1366852043-12511-1-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 ++++++++++++++++++++ mm/Kconfig | 7 +------ 2 files changed, 21 insertions(+), 6 deletions(-) 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. diff --git a/mm/Kconfig b/mm/Kconfig index 314bf49..9d6b306 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -486,9 +486,4 @@ config PROCESS_RECLAIM default n help It allows to reclaim pages of the process by /proc/pid/reclaim. - - (echo file > /proc/PID/reclaim) reclaims file-backed pages only. - (echo anon > /proc/PID/reclaim) reclaims anonymous pages only. - (echo all > /proc/PID/reclaim) reclaims all pages. - - Any other vaule is ignored. + See Documentation/filesystem/proc.txt for more details. -- 1.8.2