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 tr...@suse.de
CC: Robert Schoene robert.scho...@tu-dresden.de
CC: Jean Pihet j-pi...@ti.com
CC: Arjan van de Ven ar...@linux.intel.com
CC: Ingo Molnar mi...@elte.hu
CC: Len Brown l...@kernel.org
CC: Frederic Weisbecker fweis...@gmail.com
CC: linux...@lists.linux-foundation.org
CC: linux-a...@vger.kernel.org
CC: linux-ker...@vger.kernel.org
CC: linux-perf-us...@vger.kernel.org
CC: linux-omap@vger.kernel.org
---
arch/x86/kernel/process.c|6 --
arch/x86/kernel/process_32.c |4
arch/x86/kernel/process_64.c |6 --
drivers/cpuidle/cpuidle.c| 10 --
drivers/idle/intel_idle.c|2 --
5 files changed, 12 insertions(+), 16 deletions(-)
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 8b0ad65..b4f9ee7 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -385,6 +385,8 @@ void default_idle(void)
else
local_irq_enable();
current_thread_info()-status |= TS_POLLING;
+ trace_power_end(smp_processor_id());
+ trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
} else {
local_irq_enable();
/* loop is done by the caller */
@@ -442,8 +444,6 @@ EXPORT_SYMBOL_GPL(cpu_idle_wait);
*/
void mwait_idle_with_hints(unsigned long ax, unsigned long cx)
{
- trace_power_start(POWER_CSTATE, (ax4)+1, smp_processor_id());
- trace_cpu_idle((ax4)+1, smp_processor_id());
if (!need_resched()) {
if (cpu_has(current_cpu_data, X86_FEATURE_CLFLUSH_MONITOR))
clflush((void *)current_thread_info()-flags);
@@ -470,6 +470,8 @@ static void mwait_idle(void)
__sti_mwait(0, 0);
else
local_irq_enable();
+ trace_power_end(smp_processor_id());
+ trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
} else
local_irq_enable();
}
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 4b9befa..8d12878 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -57,8 +57,6 @@
#include asm/syscalls.h
#include asm/debugreg.h
-#include trace/events/power.h
-
asmlinkage void ret_from_fork(void) __asm__(ret_from_fork);
/*
@@ -113,8 +111,6 @@ void cpu_idle(void)
stop_critical_timings();
pm_idle();
start_critical_timings();
- trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT, 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 4c818a7..bd387e8 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -51,8 +51,6 @@
#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);
@@ -141,10 +139,6 @@ void cpu_idle(void)
pm_idle();
start_critical_timings();
- trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT,
-
