From c5461c1aa1e4f940209dba980a47690998d0b909 Mon Sep 17 00:00:00 2001 From: Minchan Kim Date: Thu, 9 May 2013 16:21:29 +0900 Subject: [PATCH] add documentation about reclaim knob on proc.txt This patch adds stuff about new reclaim field in proc.txt Change-Id: I1718fad12ec078e204e7a59769ce70fad7708756 Acked-by: Rob Landley Signed-off-by: Minchan Kim Patch-mainline: linux-mm @ 9 May 2013 16:21:29 [vinmenon@codeaurora.org: trivial merge conflict fixes] Signed-off-by: Vinayak Menon --- Documentation/filesystems/proc.txt | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt index 0bcba2823d9d..d00ead0b3012 100644 --- a/Documentation/filesystems/proc.txt +++ b/Documentation/filesystems/proc.txt @@ -137,6 +137,7 @@ 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 @@ -527,6 +528,25 @@ current value: 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.