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Groups > linux.kernel > #1736681
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: Query regarding synchronize_sched_expedited and resched_cpu |
| Date | 2017-09-21 16:00 +0200 |
| Message-ID | <usabh-1IE-41@gated-at.bofh.it> (permalink) |
| References | <upWP8-22A-9@gated-at.bofh.it> <uqwfT-Yw-3@gated-at.bofh.it> <uqAWd-432-1@gated-at.bofh.it> <ur603-7Z6-49@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, Sep 18, 2017 at 11:11:05AM -0400, Steven Rostedt wrote:
> On Sun, 17 Sep 2017 11:37:06 +0530
> Neeraj Upadhyay <neeraju@codeaurora.org> wrote:
>
> > Hi Paul, how about replacing raw_spin_trylock_irqsave with
> > raw_spin_lock_irqsave in resched_cpu()? Are there any paths
> > in RCU code, which depend on trylock check/spinlock recursion?
>
> It looks to me that resched_cpu() was added for nohz full sched
> balancing, but is not longer used by that. The only user is currently
> RCU. Perhaps we should change that from a trylock to a lock.
No, regular NOHZ balancing. NOHZ FULL wasn't conceived back then.
46cb4b7c88fa ("sched: dynticks idle load balancing")
And yeah, its no longer used for that.
And given RCU is the only user of that thing, I suppose we can indeed
change it to a full lock.
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Query regarding synchronize_sched_expedited and resched_cpu Neeraj Upadhyay <neeraju@codeaurora.org> - 2017-09-15 13:20 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-17 03:10 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Neeraj Upadhyay <neeraju@codeaurora.org> - 2017-09-17 08:10 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Steven Rostedt <rostedt@goodmis.org> - 2017-09-18 17:20 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-18 18:10 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Steven Rostedt <rostedt@goodmis.org> - 2017-09-18 18:20 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Steven Rostedt <rostedt@goodmis.org> - 2017-09-18 18:30 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-18 19:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-19 02:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Steven Rostedt <rostedt@goodmis.org> - 2017-09-19 03:30 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-19 04:30 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Byungchul Park <byungchul.park@lge.com> - 2017-09-19 04:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Byungchul Park <byungchul.park@lge.com> - 2017-09-19 04:10 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-19 04:40 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Byungchul Park <byungchul.park@lge.com> - 2017-09-19 04:50 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-19 06:10 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Boqun Feng <boqun.feng@gmail.com> - 2017-09-19 07:40 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Mike Galbraith <efault@gmx.de> - 2017-09-19 08:20 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Byungchul Park <byungchul.park@lge.com> - 2017-09-19 09:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-19 15:50 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Peter Zijlstra <peterz@infradead.org> - 2017-09-21 16:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-21 17:40 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Byungchul Park <byungchul.park@lge.com> - 2017-09-19 04:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-18 18:30 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-19 17:40 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Steven Rostedt <rostedt@goodmis.org> - 2017-09-19 18:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-19 18:20 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Peter Zijlstra <peterz@infradead.org> - 2017-09-21 16:10 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-21 18:10 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Peter Zijlstra <peterz@infradead.org> - 2017-09-21 18:40 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-21 18:50 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Peter Zijlstra <peterz@infradead.org> - 2017-09-21 16:00 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> - 2017-09-21 17:40 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Peter Zijlstra <peterz@infradead.org> - 2017-09-21 18:20 +0200
Re: Query regarding synchronize_sched_expedited and resched_cpu Steven Rostedt <rostedt@goodmis.org> - 2017-09-21 17:50 +0200
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