Re: [PATCH v10 04/35] dentry: move to per-sb LRU locks

Andrew Morton
2013-06-05T23:07:38Z

On Mon, 3 Jun 2013 23:29:33 +0400 Glauber Costa <glommer@openvz.org> wrote:

> From: Dave Chinner <dchinner@redhat.com>
>
> With the dentry LRUs being per-sb structures, there is no real need
> for a global dentry_lru_lock. The locking can be made more
> fine-grained by moving to a per-sb LRU lock, isolating the LRU
> operations of different filesytsems completely from each other.

What's the point to this patch? Is it to enable some additional
development, or is it a standalone performance tweak?

If the latter then the patch obviously makes this dentry code bloatier
and straight-line slower. So we're assuming that the multiprocessor
contention-avoidance benefits will outweigh that cost. Got any proof
of this?

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: email@kvack.org