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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2014-05-08 03:37:48 +0400 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2014-06-16 18:26:54 +0400 |
| commit | 478850160636c4f0b2558451df0e42f8c5a10939 (patch) | |
| tree | 59c82b8605bdd3dff0243084eeeef65b1efaa814 /include/linux/irq_work.h | |
| parent | b93e0b8fa819c3d5641794ed9a07e643416aa0fd (diff) | |
| download | linux-478850160636c4f0b2558451df0e42f8c5a10939.tar.xz | |
irq_work: Implement remote queueing
irq work currently only supports local callbacks. However its code
is mostly ready to run remote callbacks and we have some potential user.
The full nohz subsystem currently open codes its own remote irq work
on top of the scheduler ipi when it wants a CPU to reevaluate its next
tick. However this ad hoc solution bloats the scheduler IPI.
Lets just extend the irq work subsystem to support remote queuing on top
of the generic SMP IPI to handle this kind of user. This shouldn't add
noticeable overhead.
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: 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>
Diffstat (limited to 'include/linux/irq_work.h')
| -rw-r--r-- | include/linux/irq_work.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h index 19ae05d4b8ec..bf9422c3aefe 100644 --- a/include/linux/irq_work.h +++ b/include/linux/irq_work.h @@ -33,6 +33,11 @@ void init_irq_work(struct irq_work *work, void (*func)(struct irq_work *)) #define DEFINE_IRQ_WORK(name, _f) struct irq_work name = { .func = (_f), } bool irq_work_queue(struct irq_work *work); + +#ifdef CONFIG_SMP +bool irq_work_queue_on(struct irq_work *work, int cpu); +#endif + void irq_work_run(void); void irq_work_sync(struct irq_work *work); |