Re: [PATCH] proc: change proc_subdir_lock to a rwlock

[Alexey Dobriyan]

On Thu, Jul 30, 2015 at 1:21 AM, Eric W. Biederman
<ebiederm@xxxxxxxxxxxx> wrote:
> Two quick questions.
>
> - What motivates this work?  Are you seeing lots of
>   parallel reads on proc?

Well, yes, benchmark looks like very synthetic.
But even gcc opens /proc/meminfo, so might as well
apply the change.

Patch looks like obviously correct to me.

> - Why not rcu?  Additions and removal of proc generic
>   files is very rare.  Conversion to rcu for reads should
>   perform better and not take much more work.

If you want proc locking to be understood by ~10 people
on the planet then yes, there is RCU. :-)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/