diff options
| author | Arun Bharadwaj <abharadw@codeaurora.org> | 2013-07-03 10:35:02 -0700 |
|---|---|---|
| committer | Ruchi Kandoi <kandoiruchi@google.com> | 2015-11-30 15:50:57 -0800 |
| commit | 1381afbe1bca2caad1f007b3cacef0cc2b071047 (patch) | |
| tree | 3f07c9d368e4fec0ce72efdc9738b62c084cbef9 | |
| parent | b9b84da1c9dd7314fe6e6a8247edbc1dfd8b7c63 (diff) | |
tracing/sched: Add trace events to track cpu hotplug.
Add ftrace event trace_sched_cpu_hotplug to track cpu
hot-add and hot-remove events.
This is useful in a variety of power, performance and
debug analysis scenarios.
Change-Id: I5d202c7a229ffacc3aafb7cf9afee0b0ee7b0931
Signed-off-by: Arun Bharadwaj <abharadw@codeaurora.org>
| -rw-r--r-- | include/trace/events/sched.h | 25 | ||||
| -rw-r--r-- | kernel/cpu.c | 4 |
2 files changed, 29 insertions, 0 deletions
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h index 67e1bbf83695..e966e1f203e5 100644 --- a/include/trace/events/sched.h +++ b/include/trace/events/sched.h @@ -179,6 +179,31 @@ TRACE_EVENT(sched_migrate_task, __entry->orig_cpu, __entry->dest_cpu) ); +/* + * Tracepoint for a CPU going offline/online: + */ +TRACE_EVENT(sched_cpu_hotplug, + + TP_PROTO(int affected_cpu, int error, int status), + + TP_ARGS(affected_cpu, error, status), + + TP_STRUCT__entry( + __field( int, affected_cpu ) + __field( int, error ) + __field( int, status ) + ), + + TP_fast_assign( + __entry->affected_cpu = affected_cpu; + __entry->error = error; + __entry->status = status; + ), + + TP_printk("cpu %d %s error=%d", __entry->affected_cpu, + __entry->status ? "online" : "offline", __entry->error) +); + DECLARE_EVENT_CLASS(sched_process_template, TP_PROTO(struct task_struct *p), diff --git a/kernel/cpu.c b/kernel/cpu.c index 2434ed358ee7..74998a32a031 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -20,6 +20,8 @@ #include <linux/gfp.h> #include <linux/suspend.h> +#include <trace/events/sched.h> + #include "smpboot.h" #ifdef CONFIG_SMP @@ -357,6 +359,7 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen) out_release: cpu_hotplug_done(); + trace_sched_cpu_hotplug(cpu, err, 0); if (!err) cpu_notify_nofail(CPU_POST_DEAD | mod, hcpu); return err; @@ -432,6 +435,7 @@ out_notify: __cpu_notify(CPU_UP_CANCELED | mod, hcpu, nr_calls, NULL); out: cpu_hotplug_done(); + trace_sched_cpu_hotplug(cpu, ret, 1); return ret; } |