Re: [PATCH] Per-superblock unused dentry LRU lists V2

[David Chinner <dgc@sgi.com>]

On Thu, May 25, 2006 at 04:15:53PM +1000, David Chinner wrote:
> On Thu, May 25, 2006 at 09:36:04AM +0530, Balbir Singh wrote:
> > > +/*
> > > + * Shrink the dentry LRU on æ given superblock.
> > 			      ^^^
> > This character (ae) looks strange.
> 
> Fixed. It slipped through when I switched to the -mm tree.
> 
> > The other changes look fine. Do you have any performance numbers, any
> > results from stress tests (for version 2 of the patch)?
> 
> Not yet - I've just started the stress tests now. I had to wait for
> the storage and then reconfigure it which took some time.  It's
> currently running a create/unlink workload across 8 filesystems in
> parallel.  I'll run some dbench loads after this has run for a few
> hours.
> 
> FWIW, this create/unlink load has been triggering reliable "Busy
> inodes after unmount" errors that I've slowly been tracking down.
> After I fixed the last problem in XFS late last week, I've
> been getting a failure that i think is the unmount/prune_dcache
> races that you and Neil have recently fixed.

I just had all 8 filesystems come up with:

May 25 15:55:18 budgie kernel: XFS unmount got error 16
May 25 15:55:18 budgie kernel: xfs_fs_put_super: vfsp/0xe00000b006339280 left dangling!
May 25 15:55:18 budgie kernel: VFS: Busy inodes after unmount of dm-9. Self-destruct in 5 seconds.  Have a nice day...
May 25 15:55:19 budgie kernel: XFS: Invalid device [/dev/mapper/dm8], error=-16
May 25 15:55:35 budgie kernel: XFS unmount got error 16
May 25 15:55:35 budgie kernel: xfs_fs_put_super: vfsp/0xe000003015a18c80 left dangling!
May 25 15:55:35 budgie kernel: VFS: Busy inodes after unmount of dm-15. Self-destruct in 5 seconds.  Have a nice day...
May 25 15:55:35 budgie kernel: XFS unmount got error 16
May 25 15:55:35 budgie kernel: xfs_fs_put_super: vfsp/0xe000003015ea6280 left dangling!
May 25 15:55:35 budgie kernel: VFS: Busy inodes after unmount of dm-13. Self-destruct in 5 seconds.  Have a nice day...
May 25 15:55:36 budgie kernel: XFS: Invalid device [/dev/mapper/dm14], error=-16
May 25 15:55:36 budgie kernel: XFS: Invalid device [/dev/mapper/dm12], error=-16
May 25 15:55:42 budgie kernel: XFS unmount got error 16
May 25 15:55:42 budgie kernel: xfs_fs_put_super: vfsp/0xe00000b00633b580 left dangling!
May 25 15:55:42 budgie kernel: VFS: Busy inodes after unmount of dm-5. Self-destruct in 5 seconds.  Have a nice day...
May 25 15:55:44 budgie kernel: XFS: Invalid device [/dev/mapper/dm4], error=-16
May 25 15:55:44 budgie kernel: XFS unmount got error 16
May 25 15:55:44 budgie kernel: xfs_fs_put_super: vfsp/0xe00000b00633bc80 left dangling!
May 25 15:55:44 budgie kernel: VFS: Busy inodes after unmount of dm-11. Self-destruct in 5 seconds.  Have a nice day...
May 25 15:55:44 budgie kernel: XFS: Invalid device [/dev/mapper/dm10], error=-16
May 25 15:55:55 budgie kernel: XFS unmount got error 16
May 25 15:55:55 budgie kernel: xfs_fs_put_super: vfsp/0xe000003015d4a080 left dangling!
May 25 15:55:55 budgie kernel: VFS: Busy inodes after unmount of dm-7. Self-destruct in 5 seconds.  Have a nice day...
May 25 15:55:56 budgie kernel: XFS: Invalid device [/dev/mapper/dm6], error=-16
May 25 15:56:16 budgie kernel: XFS unmount got error 16
May 25 15:56:16 budgie kernel: xfs_fs_put_super: vfsp/0xe00000b9edeacf80 left dangling!
May 25 15:56:16 budgie kernel: VFS: Busy inodes after unmount of dm-3. Self-destruct in 5 seconds.  Have a nice day...
May 25 15:56:16 budgie kernel: XFS unmount got error 16
May 25 15:56:16 budgie kernel: xfs_fs_put_super: vfsp/0xe000003015a2a280 left dangling!
May 25 15:56:16 budgie kernel: VFS: Busy inodes after unmount of dm-1. Self-destruct in 5 seconds.  Have a nice day...

On the second test iteration. On 2.6.16, it takes about 10 iterations to get one
filesystem to do this. I'll need to look into this one further. I'm going to
reboot the machine and run some dbench tests (which typically don't trigger
this problem) and then come back to this one with added debugging....

Cheers,

Dave.
-- 
Dave Chinner
R&D Software Enginner
SGI Australian Software Group
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