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Date: Fri, 19 Aug 2011 23:04:04 +0800
From: tom.leiming@...il.com
To: rostedt@...dmis.org, fweisbec@...il.com, jean.pihet@...oldbits.com,
mingo@...hat.com, trenn@...e.de
Cc: linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
Ming Lei <tom.leiming@...il.com>
Subject: [PATCH 3/3] trace points: power: remove 'cpu_id' from trace_cpu_idle
From: Ming Lei <tom.leiming@...il.com>
This patch removes the 'cpu_id' parameter of the cpu_idle
trace point, based on the ideas below:
- the cpu_id which is passed to trace point is always the current
cpu
- the current cpu info has been included into the trace result
already
- smp_processor_id() can't be used safely in preemptible context.
Signed-off-by: Ming Lei <tom.leiming@...il.com>
---
Documentation/trace/events-power.txt | 6 +++---
arch/arm/mach-omap2/pm34xx.c | 4 ++--
arch/x86/kernel/process.c | 12 ++++++------
drivers/cpuidle/cpuidle.c | 4 ++--
include/trace/events/power.h | 15 ++++++++++++---
5 files changed, 25 insertions(+), 16 deletions(-)
diff --git a/Documentation/trace/events-power.txt b/Documentation/trace/events-power.txt
index e9d5fe3..9f2f96c 100644
--- a/Documentation/trace/events-power.txt
+++ b/Documentation/trace/events-power.txt
@@ -23,7 +23,7 @@ Cf. include/trace/events/power.h for the events definitions.
A 'cpu' event class gathers the CPU-related events: cpuidle and
cpufreq.
-cpu_idle "state=%lu cpu_id=%lu"
+cpu_idle "state=%lu"
cpu_frequency "state=%lu cpu_id=%lu"
A suspend event is used to indicate the system going in and out of the
@@ -33,8 +33,8 @@ machine_suspend "state=%lu"
Note: the value of '-1' or '4294967295' for state means an exit from the current state,
-i.e. trace_cpu_idle(4, smp_processor_id()) means that the system
-enters the idle state 4, while trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id())
+i.e. trace_cpu_idle(4) means that the system
+enters the idle state 4, while trace_cpu_idle(PWR_EVENT_EXIT)
means that the system exits the previous idle state.
The event which has 'state=4294967295' in the trace is very important to the user
diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c
index 7255d9b..cde9a11 100644
--- a/arch/arm/mach-omap2/pm34xx.c
+++ b/arch/arm/mach-omap2/pm34xx.c
@@ -502,12 +502,12 @@ static void omap3_pm_idle(void)
goto out;
trace_power_start(POWER_CSTATE, 1, smp_processor_id());
- trace_cpu_idle(1, smp_processor_id());
+ trace_cpu_idle(1);
omap_sram_idle();
trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
+ trace_cpu_idle(PWR_EVENT_EXIT);
out:
local_fiq_enable();
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index e7e3b01..fb9e92b 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -378,7 +378,7 @@ void default_idle(void)
{
if (hlt_use_halt()) {
trace_power_start(POWER_CSTATE, 1, smp_processor_id());
- trace_cpu_idle(1, smp_processor_id());
+ trace_cpu_idle(1);
current_thread_info()->status &= ~TS_POLLING;
/*
* TS_POLLING-cleared state must be visible before we
@@ -392,7 +392,7 @@ void default_idle(void)
local_irq_enable();
current_thread_info()->status |= TS_POLLING;
trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
+ trace_cpu_idle(PWR_EVENT_EXIT);
} else {
local_irq_enable();
/* loop is done by the caller */
@@ -443,7 +443,7 @@ static void mwait_idle(void)
{
if (!need_resched()) {
trace_power_start(POWER_CSTATE, 1, smp_processor_id());
- trace_cpu_idle(1, smp_processor_id());
+ trace_cpu_idle(1);
if (this_cpu_has(X86_FEATURE_CLFLUSH_MONITOR))
clflush((void *)¤t_thread_info()->flags);
@@ -454,7 +454,7 @@ static void mwait_idle(void)
else
local_irq_enable();
trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
+ trace_cpu_idle(PWR_EVENT_EXIT);
} else
local_irq_enable();
}
@@ -467,12 +467,12 @@ static void mwait_idle(void)
static void poll_idle(void)
{
trace_power_start(POWER_CSTATE, 0, smp_processor_id());
- trace_cpu_idle(0, smp_processor_id());
+ trace_cpu_idle(0);
local_irq_enable();
while (!need_resched())
cpu_relax();
trace_power_end(smp_processor_id());
- trace_cpu_idle(PWR_EVENT_EXIT, smp_processor_id());
+ trace_cpu_idle(PWR_EVENT_EXIT);
}
/*
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index d4c5423..7980732 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -106,12 +106,12 @@ int cpuidle_idle_call(void)
dev->last_state = target_state;
trace_power_start(POWER_CSTATE, next_state, dev->cpu);
- trace_cpu_idle(next_state, dev->cpu);
+ trace_cpu_idle(next_state);
dev->last_residency = target_state->enter(dev, target_state);
trace_power_end(dev->cpu);
- trace_cpu_idle(PWR_EVENT_EXIT, dev->cpu);
+ trace_cpu_idle(PWR_EVENT_EXIT);
if (dev->last_state)
target_state = dev->last_state;
diff --git a/include/trace/events/power.h b/include/trace/events/power.h
index 3878edc..8a579bd 100644
--- a/include/trace/events/power.h
+++ b/include/trace/events/power.h
@@ -27,11 +27,20 @@ DECLARE_EVENT_CLASS(cpu,
(unsigned long)__entry->cpu_id)
);
-DEFINE_EVENT(cpu, cpu_idle,
+TRACE_EVENT(cpu_idle,
+ TP_PROTO(unsigned int state),
- TP_PROTO(unsigned int state, unsigned int cpu_id),
+ TP_ARGS(state),
+
+ TP_STRUCT__entry(
+ __field( u32, state )
+ ),
+
+ TP_fast_assign(
+ __entry->state = state;
+ ),
- TP_ARGS(state, cpu_id)
+ TP_printk("state=%lu", (unsigned long)__entry->state)
);
/* This file can get included multiple times, TRACE_HEADER_MULTI_READ at top */
--
1.7.4.1
--
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