Re: [GIT PULL] Re: REGRESSION: Performance regressions fromswitching anon_vma->lock to mutex

[Paul E. McKenney]

On Wed, Jun 15, 2011 at 02:05:46PM -0700, Linus Torvalds wrote:
> 
> 
> Ingo Molnar <mingo@xxxxxxx> wrote:
> >
> >I have this fix queued up currently:
> >
> >  09223371deac: rcu: Use softirq to address performance regression
> 
> I really don't think that is even close to enough.
> 
> It still does all the callbacks in the threads, and according to Peter, about half the rcu time in the threads remained..

I am putting together a patch that gets rid of the kthreads in the
!RCU_BOOST case.  The time will still be consumed, but in softirq
context, though of course with many fewer context switches.

							Thanx, Paul
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