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Groups > linux.kernel > #1489523
| From | "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y |
| Date | 2016-09-22 22:30 +0200 |
| Message-ID | <skiN3-2zX-23@gated-at.bofh.it> (permalink) |
| References | <skgUV-1qI-13@gated-at.bofh.it> <skgUV-1qI-11@gated-at.bofh.it> <skhei-1xN-35@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Thu, Sep 22, 2016 at 08:42:28PM +0200, Peter Zijlstra wrote:
> On Thu, Sep 22, 2016 at 02:25:01PM -0400, Mikulas Patocka wrote:
> > I've found a document that says that cond_resched() is needed on
> > preemptible kernels to mark RCU quiescent states:
> >
> > https://lwn.net/Articles/603252/
> >
> > Paul, is cond_resched() still needed on current RCU implementation? Or not?
>
> No, we ripped that out. See 4a81e8328d37 ("rcu: Reduce overhead of
> cond_resched() checks for RCU")
I would instead say that we changed the algorithm to reduce the overhead
in the common case, but yes, this commit did change things quite a bit.
Thanx, Paul
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Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y Mikulas Patocka <mpatocka@redhat.com> - 2016-09-22 20:30 +0200
Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-22 20:40 +0200
Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y Peter Zijlstra <peterz@infradead.org> - 2016-09-22 20:50 +0200
Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-22 22:30 +0200
Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y Peter Zijlstra <peterz@infradead.org> - 2016-09-23 10:50 +0200
Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2016-09-23 16:50 +0200
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