linux-kernel - Re: [PATCH v2 6/6] add documentation on proc.txt

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Message-ID: <20130424081814.GC2978@blaptop>
Date:	Wed, 24 Apr 2013 17:18:14 +0900
From:	Minchan Kim <minchan@...nel.org>
To:	Rob Landley <rob@...dley.net>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Rik van Riel <riel@...hat.com>,
	Dave Hansen <dave.hansen@...el.com>
Subject: Re: [PATCH v2 6/6] add documentation on proc.txt

Hello Rob,

On Wed, Apr 24, 2013 at 01:49:45AM -0500, Rob Landley wrote:
> On 04/23/2013 08:41:04 PM, Minchan Kim wrote:
> >This patch adds stuff about new reclaim field in proc.txt
> >
> >Cc: Rob Landley <rob@...dley.net>
> >Signed-off-by: Minchan Kim <minchan@...nel.org>
> >---
> >
> >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.
> 
> And size in bytes should be a multiple of page size?

Not necessary. It's same with madvise that VM handle the page
which includes the byte.

> 
> >+
> >+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
> 
> Would you like to balance your parentheses?

Fixed. I will include your Acked-by in next spin.
Thanks!

> 
> Acked-by: Rob Landley <rob@...dley.net>
> 
> Rob

-- 
Kind regards,
Minchan Kim
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