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linux-sg2042
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x86, perf: Add power_end event to process_*.c cpu_idle routine 

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 Schoene <robert.schoene@tu-dresden.de>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1276515440.5441.45.camel@localhost>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Robert Schöne 2010-06-14 13:37:20 +02:00 committed by Ingo Molnar
parent 646b1db495
commit c882e0feb9
2 changed files with 9 additions and 0 deletions
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4
arch/x86/kernel/process_32.c
View File

@ -57,6 +57,8 @@
#include <asm/syscalls.h>
#include <asm/debugreg.h>
#include <trace/events/power.h>
asmlinkage void ret_from_fork(void) __asm__("ret_from_fork");
/*
@ -111,6 +113,8 @@ 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();

5
arch/x86/kernel/process_64.c
View File

@ -51,6 +51,8 @@
#include <asm/syscalls.h>
#include <asm/debugreg.h>
#include <trace/events/power.h>
asmlinkage extern void ret_from_fork(void);
DEFINE_PER_CPU(unsigned long, old_rsp);
@ -138,6 +140,9 @@ 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. */