Re: [PATCH 0/9] Sync and VFS scalability improvements

[Mel Gorman]

On Tue, Mar 10, 2015 at 03:45:15PM -0400, Josef Bacik wrote:
> These are patches that Dave Chinner wrote two years ago that are still very much
> needed today.  I recently ran into a problem where I had millions of inodes that
> needed to be evicted at unmount time and it soft locked up the box and kept any
> other file system from doing work.  These patches fix this problem by breaking
> the inode_sb_list_lock into per-sb, and then converting the per sb inode list
> into a list_lru for better scalability.
> 

I'm not reviewing this series, I just heard it mentioned at LSF/MM and again
on a DAX thread and am taking a quick glance out of curiousity. FWIW, I saw
the lockup-on-umount warning every time I ran Dave's xfsrepair workload when
unmounting after running fsmark. I didn't report it because Dave mentioned
at Vault that it was a known problem and someone was looking at it already.

-- 
Mel Gorman
SUSE Labs
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