Messages in this thread |  | | Date | Thu, 21 Sep 2017 15:55:46 +0200 | From | Peter Zijlstra <> | Subject | Re: Query regarding synchronize_sched_expedited and resched_cpu |
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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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