| Message ID | 1390802904-28399-5-git-send-email-nicolas.pitre@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 01/27/2014 07:08 AM, Nicolas Pitre wrote: > In order to integrate cpuidle with the scheduler, we must have a better > proximity in the core code with what cpuidle is doing and not delegate > such interaction to arch code. > > Architectures implementing arch_cpu_idle() should simply enter > a cheap idle mode in the absence of a proper cpuidle driver. > > Signed-off-by: Nicolas Pitre <nico@linaro.org> This patch without the next ones will lead to an extra call to cpuidle_idle_call. cpuidle_idle_call arch_cpu_idle cpuidle_idle_call x86_idle But I guess it is acceptable as it is fixed with the next patches of the serie. Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> > --- > kernel/cpu/idle.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/kernel/cpu/idle.c b/kernel/cpu/idle.c > index 4e327e211b..a6f40ad9f8 100644 > --- a/kernel/cpu/idle.c > +++ b/kernel/cpu/idle.c > @@ -3,6 +3,7 @@ > */ > #include <linux/sched.h> > #include <linux/cpu.h> > +#include <linux/cpuidle.h> > #include <linux/tick.h> > #include <linux/mm.h> > #include <linux/stackprotector.h> > @@ -94,7 +95,8 @@ static void cpu_idle_loop(void) > if (!current_clr_polling_and_test()) { > stop_critical_timings(); > rcu_idle_enter(); > - arch_cpu_idle(); > + if (cpuidle_idle_call()) > + arch_cpu_idle(); > WARN_ON_ONCE(irqs_disabled()); > rcu_idle_exit(); > start_critical_timings(); >
diff --git a/kernel/cpu/idle.c b/kernel/cpu/idle.c index 4e327e211b..a6f40ad9f8 100644 --- a/kernel/cpu/idle.c +++ b/kernel/cpu/idle.c @@ -3,6 +3,7 @@ */ #include <linux/sched.h> #include <linux/cpu.h> +#include <linux/cpuidle.h> #include <linux/tick.h> #include <linux/mm.h> #include <linux/stackprotector.h> @@ -94,7 +95,8 @@ static void cpu_idle_loop(void) if (!current_clr_polling_and_test()) { stop_critical_timings(); rcu_idle_enter(); - arch_cpu_idle(); + if (cpuidle_idle_call()) + arch_cpu_idle(); WARN_ON_ONCE(irqs_disabled()); rcu_idle_exit(); start_critical_timings();
In order to integrate cpuidle with the scheduler, we must have a better proximity in the core code with what cpuidle is doing and not delegate such interaction to arch code. Architectures implementing arch_cpu_idle() should simply enter a cheap idle mode in the absence of a proper cpuidle driver. Signed-off-by: Nicolas Pitre <nico@linaro.org> --- kernel/cpu/idle.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-)