From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx128.postini.com [74.125.245.128]) by kanga.kvack.org (Postfix) with SMTP id 752EA6B0038 for ; Tue, 23 Apr 2013 21:41:42 -0400 (EDT) From: Minchan Kim Subject: [PATCH v2 6/6] add documentation on proc.txt Date: Wed, 24 Apr 2013 10:41:04 +0900 Message-Id: <1366767664-17541-7-git-send-email-minchan@kernel.org> In-Reply-To: <1366767664-17541-1-git-send-email-minchan@kernel.org> References: <1366767664-17541-1-git-send-email-minchan@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Michael Kerrisk , Rik van Riel , Dave Hansen , Minchan Kim , Rob Landley This patch adds stuff about new reclaim field in proc.txt Cc: Rob Landley Signed-off-by: Minchan Kim --- Rob, I didn't add your Acked-by because interface was slight changed. I hope you give Acke-by after review again. Thanks. Documentation/filesystems/proc.txt | 22 ++++++++++++++++++++++ mm/Kconfig | 7 +------ 2 files changed, 23 insertions(+), 6 deletions(-) diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 488c094..1411ad0 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 +490,27 @@ 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 2 pages from 0x100000. + +To reclaim both pages in address range, + > echo $((1<<20) 8192 > /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 -- 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