Re: [RT LATENCY] 249 microsecond latency caused by slub'sunfreeze_partials() code.

[Joonsoo Kim]

On Tue, Mar 26, 2013 at 11:30:32PM -0400, Steven Rostedt wrote:
> On Wed, 2013-03-27 at 11:59 +0900, Joonsoo Kim wrote:
> 
> > How about using spin_try_lock() in unfreeze_partials() and
> > using spin_lock_contented() in get_partial_node() to reduce latency?
> > IMHO, this doesn't make code more deterministic, but can maintain
> > a benefit of cpu partial page with tolerable latency.
> 
> And what do you do when you fail the try lock? Try again, or just break
> out?

Just break out.

> 
> We can run benchmarks, but I don't like playing games in -rt. It either
> is deterministic, or it isn't.

Okay.

> 
> -- Steve
> 
> 
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