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perf sched timehist: Introduce struct idle_time_data 

The struct idle_time_data is to keep idle stats with callchains entering
to the idle task.  The normal thread_runtime calculation is done
transparently since it extends the struct thread_runtime.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: David Ahern <dsahern@gmail.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20161208144755.16673-3-namhyung@kernel.org
[ Align struct field names ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2016-12-08 23:47:51 +09:00 committed by Arnaldo Carvalho de Melo
parent 96039c7c52
commit 3bc2fa9cb8
1 changed files with 33 additions and 4 deletions
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37
tools/perf/builtin-sched.c
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@ -230,6 +230,15 @@ struct evsel_runtime {
u32 ncpu; /* highest cpu slot allocated */
};
/* per cpu idle time data */
struct idle_thread_runtime {
struct thread_runtime tr;
struct thread *last_thread;
struct rb_root sorted_root;
struct callchain_root callchain;
struct callchain_cursor cursor;
};
/* track idle times per cpu */
static struct thread **idle_threads;
static int idle_max_cpu;
@ -1997,13 +2006,31 @@ static void save_task_callchain(struct perf_sched *sched,
}
}
static int init_idle_thread(struct thread *thread)
{
struct idle_thread_runtime *itr;
thread__set_comm(thread, idle_comm, 0);
itr = zalloc(sizeof(*itr));
if (itr == NULL)
return -ENOMEM;
init_stats(&itr->tr.run_stats);
callchain_init(&itr->callchain);
callchain_cursor_reset(&itr->cursor);
thread__set_priv(thread, itr);
return 0;
}
/*
* Track idle stats per cpu by maintaining a local thread
* struct for the idle task on each cpu.
*/
static int init_idle_threads(int ncpu)
{
int i;
int i, ret;
idle_threads = zalloc(ncpu * sizeof(struct thread *));
if (!idle_threads)
@ -2017,7 +2044,9 @@ static int init_idle_threads(int ncpu)
if (idle_threads[i] == NULL)
return -ENOMEM;
thread__set_comm(idle_threads[i], idle_comm, 0);
ret = init_idle_thread(idle_threads[i]);
if (ret < 0)
return ret;
}
return 0;
@ -2064,8 +2093,8 @@ static struct thread *get_idle_thread(int cpu)
idle_threads[cpu] = thread__new(0, 0);
if (idle_threads[cpu]) {
idle_threads[cpu]->tid = 0;
thread__set_comm(idle_threads[cpu], idle_comm, 0);
if (init_idle_thread(idle_threads[cpu]) < 0)
return NULL;
}
}