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authorJisheng Zhang <jszhang@marvell.com>2015-08-20 12:54:39 +0800
committerThomas Gleixner <tglx@linutronix.de>2015-08-20 21:37:45 +0200
commite43d0189ac02415fe4487f79fc35e8f147e9ea0d (patch)
tree91d56ed51d8a7fda2e4062c576f00b63b1ccec4e /arch
parentb5be5b7fff25f806625c801832eded5ceedc70e9 (diff)
downloadlinux-e43d0189ac02415fe4487f79fc35e8f147e9ea0d.tar.bz2
x86/idle: Restore trace_cpu_idle to mwait_idle() calls
Commit b253149b843f ("sched/idle/x86: Restore mwait_idle() to fix boot hangs, to improve power savings and to improve performance") restores mwait_idle(), but the trace_cpu_idle related calls are missing. This causes powertop on my old desktop powered by Intel Core2 E6550 to report zero wakeups and zero events. Add them back to restore the proper behaviour. Fixes: b253149b843f ("sched/idle/x86: Restore mwait_idle() to ...") Signed-off-by: Jisheng Zhang <jszhang@marvell.com> Cc: <len.brown@intel.com> Cc: stable@vger.kernel.org # 4.1 Link: http://lkml.kernel.org/r/1440046479-4262-1-git-send-email-jszhang@marvell.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/process.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 397688beed4b..c27cad726765 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -408,6 +408,7 @@ static int prefer_mwait_c1_over_halt(const struct cpuinfo_x86 *c)
static void mwait_idle(void)
{
if (!current_set_polling_and_test()) {
+ trace_cpu_idle_rcuidle(1, smp_processor_id());
if (this_cpu_has(X86_BUG_CLFLUSH_MONITOR)) {
smp_mb(); /* quirk */
clflush((void *)&current_thread_info()->flags);
@@ -419,6 +420,7 @@ static void mwait_idle(void)
__sti_mwait(0, 0);
else
local_irq_enable();
+ trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id());
} else {
local_irq_enable();
}