Re: lockmeter

[Ingo Molnar]

* Bill Huey <billh@xxxxxxxxxxxxxxxxx> wrote:

> > ISTR we still thought dcache scalability was a significant problem 
> > last time anyone looked at it seriously - just never got fixed. 
> > Dipankar?
> 
> My lock stat stuff shows dcache to a be a problem under -rt as well. 
> [...]

yeah, it shows up frequently, but it's hard to fix.

for a well-cached kernel rebuild on a system with lots of RAM and lots 
of CPUs, files_lock is the leading lock. (because the dcache is mostly 
populated already) files_lock is even more of a problem for workloads 
that do lots of open()/close() [Apache comes to mind].

	Ingo
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