[PATCH] x86: add power_end event to process_*.c cpu_idle routine
in [Kernel]
|
Prev: [PATCH 01/12] tracing, vmscan: Add trace events for kswapd wakeup, sleeping and direct reclaim
Next: Bluetooth: hidp: Add support for hidraw HIDIOCGFEATURE and HIDIOCSFEATURE
From: Robert Schöne on 14 Jun 2010 07:40 From: Robert Schöne <robert.schoene(a)tu-dresden.de> Systems using the idle thread from process_32.c and process_64.c do not generate power_end events which could be traced using perf. This patch adds the event generation for such systems. Signed-off-by: Robert Schöne <robert.schoene(a)tu-dresden.de> Acked-by: Arjan van de Ven <arjan(a)linux.intel.com> --- The smp_processor_id() is given to power_end as i hope that the changed interface defined in http://lkml.org/lkml/2010/4/27/271 will be part of the standard tree one day. (It is currently part of the -mm tree.) As long as this new interface is not included in the standard tree, this patch won't make no harm. When it will be included, this code does not have to be touched anymore. arch/x86/kernel/process_32.c | 4 ++++ arch/x86/kernel/process_64.c | 5 +++++ 2 files changed, 9 insertions(+), 0 deletions(-) diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c index f6c6266..134f5f9 100644 --- a/arch/x86/kernel/process_32.c +++ b/arch/x86/kernel/process_32.c @@ -58,6 +58,8 @@ #include <asm/ds.h> #include <asm/debugreg.h> +#include <trace/events/power.h> + asmlinkage void ret_from_fork(void) __asm__("ret_from_fork"); /* @@ -112,6 +114,8 @@ void cpu_idle(void) stop_critical_timings(); pm_idle(); start_critical_timings(); + + trace_power_end(smp_processor_id()); } tick_nohz_restart_sched_tick(); preempt_enable_no_resched(); diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c index 17cb329..01c55ed 100644 --- a/arch/x86/kernel/process_64.c +++ b/arch/x86/kernel/process_64.c @@ -52,6 +52,8 @@ #include <asm/ds.h> #include <asm/debugreg.h> +#include <trace/events/power.h> + asmlinkage extern void ret_from_fork(void); DEFINE_PER_CPU(unsigned long, old_rsp); @@ -139,6 +141,9 @@ void cpu_idle(void) stop_critical_timings(); pm_idle(); start_critical_timings(); + + trace_power_end(smp_processor_id()); + /* In many cases the interrupt that ended idle has already called exit_idle. But some idle loops can be woken up without interrupt. */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |