path: root/drivers
diff options
authorThomas Renninger <trenn@suse.de>2011-01-07 11:29:44 +0100
committerLen Brown <len.brown@intel.com>2011-01-12 18:05:16 -0500
commitf77cfe4ea21760268c0277fa3e4b02dfd2a2c2f4 (patch)
treeffd83ee874d1cbe062cd70cade50c017725ba586 /drivers
parentf878133bf022717b880d0e0995b8f91436fd605c (diff)
cpuidle/x86/perf: fix power:cpu_idle double end events and throw cpu_idle events from the cpuidle layer
Currently intel_idle and acpi_idle driver show double cpu_idle "exit idle" events -> this patch fixes it and makes cpu_idle events throwing less complex. It also introduces cpu_idle events for all architectures which use the cpuidle subsystem, namely: - arch/arm/mach-at91/cpuidle.c - arch/arm/mach-davinci/cpuidle.c - arch/arm/mach-kirkwood/cpuidle.c - arch/arm/mach-omap2/cpuidle34xx.c - arch/drivers/acpi/processor_idle.c (for all cases, not only mwait) - arch/x86/kernel/process.c (did throw events before, but was a mess) - drivers/idle/intel_idle.c (did throw events before) Convention should be: Fire cpu_idle events inside the current pm_idle function (not somewhere down the the callee tree) to keep things easy. Current possible pm_idle functions in X86: c1e_idle, poll_idle, cpuidle_idle_call, mwait_idle, default_idle -> this is really easy is now. This affects userspace: The type field of the cpu_idle power event can now direclty get mapped to: /sys/devices/system/cpu/cpuX/cpuidle/stateX/{name,desc,usage,time,...} instead of throwing very CPU/mwait specific values. This change is not visible for the intel_idle driver. For the acpi_idle driver it should only be visible if the vendor misses out C-states in his BIOS. Another (perf timechart) patch reads out cpuidle info of cpu_idle events from: /sys/.../cpuidle/stateX/*, then the cpuidle events are mapped to the correct C-/cpuidle state again, even if e.g. vendors miss out C-states in their BIOS and for example only export C1 and C3. -> everything is fine. Signed-off-by: Thomas Renninger <trenn@suse.de> CC: Robert Schoene <robert.schoene@tu-dresden.de> CC: Jean Pihet <j-pihet@ti.com> CC: Arjan van de Ven <arjan@linux.intel.com> CC: Ingo Molnar <mingo@elte.hu> CC: Frederic Weisbecker <fweisbec@gmail.com> CC: linux-pm@lists.linux-foundation.org CC: linux-acpi@vger.kernel.org CC: linux-kernel@vger.kernel.org CC: linux-perf-users@vger.kernel.org CC: linux-omap@vger.kernel.org Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers')
2 files changed, 8 insertions, 4 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 386888f10df0..e4855c33f897 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -96,7 +96,15 @@ static void cpuidle_idle_call(void)
/* enter the state and update stats */
dev->last_state = target_state;
+ trace_power_start(POWER_CSTATE, next_state, dev->cpu);
+ trace_cpu_idle(next_state, dev->cpu);
dev->last_residency = target_state->enter(dev, target_state);
+ trace_power_end(dev->cpu);
+ trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu);
if (dev->last_state)
target_state = dev->last_state;
@@ -106,8 +114,6 @@ static void cpuidle_idle_call(void)
/* give the governor an opportunity to reflect on the outcome */
if (cpuidle_curr_governor->reflect)
- trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c
index 56ac09d6c930..60fa6ecdb41f 100644
--- a/drivers/idle/intel_idle.c
+++ b/drivers/idle/intel_idle.c
@@ -220,8 +220,6 @@ static int intel_idle(struct cpuidle_device *dev, struct cpuidle_state *state)
kt_before = ktime_get_real();
- trace_power_start(POWER_CSTATE, (eax >> 4) + 1, cpu);
- trace_cpu_idle((eax >> 4) + 1, cpu);
if (!need_resched()) {
__monitor((void *)&current_thread_info()->flags, 0, 0);