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| author | Todd E Brandt <todd.e.brandt@linux.intel.com> | 2014-06-06 05:40:17 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-06-07 00:18:07 +0200 |
| commit | bb3632c6101b2fad07e6246721466b984b1e0e9d (patch) | |
| tree | 1f5755a94c7dfe2b2051411e0f08620b398a9059 /kernel/cpu.c | |
| parent | 3eba148d75670f61463dd3c9ef8672da8f290f36 (diff) | |
| download | lwn-bb3632c6101b2fad07e6246721466b984b1e0e9d.tar.gz lwn-bb3632c6101b2fad07e6246721466b984b1e0e9d.zip | |
PM / sleep: trace events for suspend/resume
Adds trace events that give finer resolution into suspend/resume. These
events are graphed in the timelines generated by the analyze_suspend.py
script. They represent large areas of time consumed that are typical to
suspend and resume.
The event is triggered by calling the function "trace_suspend_resume"
with three arguments: a string (the name of the event to be displayed
in the timeline), an integer (case specific number, such as the power
state or cpu number), and a boolean (where true is used to denote the start
of the timeline event, and false to denote the end).
The suspend_resume trace event reproduces the data that the machine_suspend
trace event did, so the latter has been removed.
Signed-off-by: Todd Brandt <todd.e.brandt@intel.com>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/cpu.c')
| -rw-r--r-- | kernel/cpu.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index a9e710eef0e2..76deba01322a 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -20,6 +20,7 @@ #include <linux/gfp.h> #include <linux/suspend.h> #include <linux/lockdep.h> +#include <trace/events/power.h> #include "smpboot.h" @@ -522,7 +523,9 @@ int disable_nonboot_cpus(void) for_each_online_cpu(cpu) { if (cpu == first_cpu) continue; + trace_suspend_resume(TPS("CPU_OFF"), cpu, true); error = _cpu_down(cpu, 1); + trace_suspend_resume(TPS("CPU_OFF"), cpu, false); if (!error) cpumask_set_cpu(cpu, frozen_cpus); else { @@ -566,7 +569,9 @@ void __ref enable_nonboot_cpus(void) arch_enable_nonboot_cpus_begin(); for_each_cpu(cpu, frozen_cpus) { + trace_suspend_resume(TPS("CPU_ON"), cpu, true); error = _cpu_up(cpu, 1); + trace_suspend_resume(TPS("CPU_ON"), cpu, false); if (!error) { printk(KERN_INFO "CPU%d is up\n", cpu); continue; |