Re: [PATCH -v5][RFC]: mutex: implement adaptive spinning

[Peter W. Morreale]

On Wed, 2009-01-07 at 15:51 -0700, Peter W. Morreale wrote:
> On Wed, 2009-01-07 at 23:33 +0100, Ingo Molnar wrote:
> > * Gregory Haskins <ghaskins@xxxxxxxxxx> 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

Never mind.  Bogus argument.  

That's why we have you Big Guns out there... - To keep us rif-raf in
line... 

:-)

Best,
-PWM

--
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/