Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y
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- Subject: Re: [tip:sched/core] sched/core: Avoid _cond_resched() for PREEMPT=y
- From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
- Date: Thu, 22 Sep 2016 20:42:28 +0200
- Cc: hpa@xxxxxxxxx, paulmck@xxxxxxxxxxxxxxxxxx, josh@xxxxxxxxxxxxxxxx, rostedt@xxxxxxxxxxx, mathieu.desnoyers@xxxxxxxxxxxx, jiangshanlai@xxxxxxxxx, torvalds@xxxxxxxxxxxxxxxxxxxx, mingo@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, oleg@xxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <alpine.LRH.2.02.1609221421290.12217@file01.intranet.prod.int.rdu2.redhat.com>
- References: <tip-35a773a07926a22bf19d77ee00024522279c4e68@git.kernel.org> <alpine.LRH.2.02.1609221421290.12217@file01.intranet.prod.int.rdu2.redhat.com>
- User-agent: Mutt/1.5.23.1 (2014-03-12)
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")
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