linux-kernel - Re: [Lsf] [RFC] writeback and cgroup

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Date:	Sat, 14 Apr 2012 14:25:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Jan Kara <jack@...e.cz>, ctalbott@...gle.com, rni@...gle.com,
	andrea@...terlinux.com, containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, lsf@...ts.linux-foundation.org,
	linux-mm@...ck.org, jmoyer@...hat.com, lizefan@...wei.com,
	cgroups@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [Lsf] [RFC] writeback and cgroup

On Wed, 2012-04-11 at 11:40 -0400, Vivek Goyal wrote:
> 
> Ok, that's good to know. How would we configure this special bdi? I am
> assuming there is no backing device visible in /sys/block/<device>/queue/?
> Same is true for network file systems. 

root@...ns:/usr/src/linux-2.6# awk '/nfs/ {print $3}' /proc/self/mountinfo | while read bdi ; do ls -la /sys/class/bdi/${bdi}/ ; done
ls: cannot access /sys/class/bdi/0:20/: No such file or directory
total 0
drwxr-xr-x  3 root root    0 2012-03-27 23:18 .
drwxr-xr-x 35 root root    0 2012-03-27 23:02 ..
-rw-r--r--  1 root root 4096 2012-04-14 14:22 max_ratio
-rw-r--r--  1 root root 4096 2012-04-14 14:22 min_ratio
drwxr-xr-x  2 root root    0 2012-04-14 14:22 power
-rw-r--r--  1 root root 4096 2012-04-14 14:22 read_ahead_kb
lrwxrwxrwx  1 root root    0 2012-03-27 23:18 subsystem -> ../../../../class/bdi
-rw-r--r--  1 root root 4096 2012-03-27 23:18 uevent

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