Re: [PATCH RFC idle 2/3] arm: Avoid invoking RCU when CPU is idle
From: Paul E. McKenney <hidden>
Date: 2012-02-02 23:27:36
Also in:
linux-arm-kernel, linux-samsung-soc
On Thu, Feb 02, 2012 at 06:03:39PM -0500, Steven Rostedt wrote: [ . . . ]
Anyway, one answer is (and I was talking with Paul about this on IRC) is that we can create a special "TRACE_EVENT_IDLE()" that will explicitly call "rcu_idle_exit/enter()" as it expects to be called with it off. This should solve most issues I believe.
You OK with something like RCU_NONIDLE() rather than RCU_EVENT_IDLE()?
I have this funny feeling that tracing won't be the only thing using
RCU from idle. :-/
Something like this, perhaps?
#define RCU_NONIDLE(a) \
do { \
rcu_idle_exit(); \
do { a; } while (0); \
rcu_idle_enter(); \
}
Thanx, Paul