Re: [RFC][PATCH] fs: optimize inotify/fsnotify code for unwatched files

From: Peter Zijlstra
Date: Mon Jun 22 2015 - 09:28:37 EST

On Sat, Jun 20, 2015 at 06:30:58PM -0700, Paul E. McKenney wrote:
> Well, it is not hard to have an SRCU-like thing that doesn't have
> read-side memory barriers, given that older versions of SRCU didn't
> have them. However, the price is increased latency for the analog to
> synchronize_srcu(). I am guessing that this would not be a problem
> for notification-group destruction, which is presumably rare.

I don't think it ever makes sense to optimize for a global state. So
screw sync_srcu() and make the srcu_read_lock() thing go fast.

If you need fast global state you're doing it wrong.
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