lkml.org 
[lkml]   [2009]   [Jan]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH -v5][RFC]: mutex: implement adaptive spinning
From
Date
On Wed, 2009-01-07 at 23:33 +0100, Ingo Molnar wrote:
> * Gregory Haskins <ghaskins@novell.com> wrote:
>
> > Can I ask a simple question in light of all this discussion?
> >
> > "Is get_task_struct() really that bad?"
>
> it dirties a cacheline and it also involves atomics.
>
> Also, it's a small design cleanliness issue to me: get_task_struct()
> impacts the lifetime of an object - and if a locking primitive has
> side-effects on object lifetimes that's never nice.
>

True, but it's for one iteration * NR_CPUS, max.

Best,
-PWM


> Ingo
>



\
 
 \ /
  Last update: 2009-01-07 23:53    [W:0.864 / U:0.304 seconds]
©2003-2014 Jasper Spaans. Advertise on this site