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Commit c882e0fe authored by Robert Schöne's avatar Robert Schöne Committed by Ingo Molnar
Browse files

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: default avatarRobert Schoene <robert.schoene@tu-dresden.de>
Acked-by: default avatarArjan van de Ven <arjan@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1276515440.5441.45.camel@localhost>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 646b1db4

arch/x86/kernel/process_32.c

+4 −0
Original line number Diff line number Diff line
@@ -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();

arch/x86/kernel/process_64.c

+5 −0
Original line number Diff line number Diff line
@@ -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. */