Re: [PATCH] sched: recover sched_yield task running time increase

[Rik van Riel]

On 04/06/2011 11:08 PM, Alex,Shi wrote:
> On Wed, 2011-04-06 at 16:04 +0800, Peter Zijlstra wrote:
> > On Wed, 2011-04-06 at 06:33 +0800, Alex Shi wrote:

> > You do know that any app that relies on sched_yield behaviour is more
> > than broken? Using sched_yield() for anything other than SCHED_FIFO
> > tasks is well outside spec.
> >
> > Furthermore, apparently you used sysctl_sched_compat_yield, which was
> > bound to disappear some time, since with the default settings the yield
> > semantics didn't actually change.
>
> Yes, I used sched_compat_yield, otherwise volano will become extremely
> slow in my single machine testing. We may reconsider our testing
> setting.

With what JVM is this happening?

Surely not every JVM uses user space spinlocks and
yield, when we have futexes available?



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