| Date | Mon, 24 Oct 2011 05:07:18 -0700 | From | "Paul E. McKenney" <> | Subject | Re: [PATCH tip/core/rcu 36/55] rcu: Prevent early boot set_need_resched() from __rcu_pending() |
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On Sun, Oct 16, 2011 at 06:49:15PM -0700, Josh Triplett wrote: > On Tue, Sep 06, 2011 at 11:00:30AM -0700, Paul E. McKenney wrote: > > From: Paul E. McKenney <paul.mckenney@linaro.org> > > > > There isn't a whole lot of point in poking the scheduler before there > > are other tasks to switch to. This commit therefore adds a check > > for rcu_scheduler_fully_active in __rcu_pending() to suppress any > > pre-scheduler calls to set_need_resched(). The downside of this approach > > is additional runtime overhead in a reasonably hot code path. > > If you're concerned about the runtime overhead, this does seem like a > perfect candidate for jump labels.
I have added this to my todo list, but would welcome a patch.
Thanx, Paul
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