Re: [PATCH 4/5] nohz: Move full nohz kick to its own IPI

[Peter Zijlstra <peterz@infradead.org>]

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On Tue, Jun 03, 2014 at 04:40:19PM +0200, Frederic Weisbecker wrote:
> Now that the irq work subsystem can queue remote callbacks, it's
> a perfect fit to safely queue IPIs when interrupts are disabled
> without worrying about concurrent callers.
> 
> Lets use it for the full dynticks kick to notify a CPU that it's
> exiting single task mode.
> 
> This unbloats a bit the scheduler IPI that the nohz code was abusing
> for its cool "callable anywhere/anytime" properties.
> 
> Cc: Andrew Morton <akpm@linux-foundation.org>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Kevin Hilman <khilman@linaro.org>
> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
> ---
>  include/linux/tick.h     |  9 ++++++++-
>  kernel/sched/core.c      |  5 +----
>  kernel/sched/sched.h     |  2 +-
>  kernel/time/tick-sched.c | 10 ++++++----
>  4 files changed, 16 insertions(+), 10 deletions(-)
> 

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