linux-kernel - Re: [git pull] more vfs fixes for final

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Message-ID: <20110311210938.GB8211@hostway.ca>
Date:	Fri, 11 Mar 2011 13:09:38 -0800
From:	Simon Kirby <sim@...tway.ca>
To:	"J. Bruce Fields" <bfields@...ldses.org>
Cc:	Mark Moseley <moseleymark@...il.com>, linux-nfs@...r.kernel.org,
	Al Viro <viro@...IV.linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [git pull] more vfs fixes for final

On Thu, Mar 10, 2011 at 11:58:56AM +0000, Al Viro wrote:

> commit d891eedbc3b1b0fade8a9ce60cc0eba1cccb59e5
> Author: J. Bruce Fields <bfields@...ldses.org>
> Date:   Tue Jan 18 15:45:09 2011 -0500
> 
>     fs/dcache: allow d_obtain_alias() to return unhashed dentries

Hmm, I was hoping this or something recently would fix nfs_inode_cache
growing forever and flush processes taking lots of system time since
2.6.36. For example:

  OBJS ACTIVE  USE OBJ SIZE  SLABS OBJ/SLAB CACHE SIZE NAME
3457486 3454365  99%    0.95K 105601       33   3379232K nfs_inode_cache
469638 248761  52%    0.10K  12042       39     48168K buffer_head
243712 216348  88%    0.02K    952      256      3808K kmalloc-16
232785 202185  86%    0.19K  11085       21     44340K dentry
149696  54633  36%    0.06K   2339       64      9356K kmalloc-64
115976 106806  92%    0.55K   4142       28     66272K radix_tree_node
 76064  45680  60%    0.12K   2377       32      9508K kmalloc-128
 62336  53427  85%    0.03K    487      128      1948K kmalloc-32
 41958  41250  98%    0.75K   1998       21     31968K ext3_inode_cache

This clears them all, similar to what you posted:

echo 2 > /proc/sys/vm/drop_caches
sync
echo 2 > /proc/sys/vm/drop_caches

...but 2.6.38-rc8 still doesn't seem to fix it.

http://0x.ca/sim/ref/2.6.37/cpu3_nfs.png
http://www.spinics.net/lists/linux-nfs/msg18212.html

Any ideas?  This started with 2.6.36.

Simon-
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