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perf thread-stack: Allow for a thread stack array 

In preparation for fixing thread stack processing for the idle task,
allow for a thread stack array.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-5-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2018-12-21 14:06:16 +02:00 committed by Arnaldo Carvalho de Melo
parent bd8e68ace1
commit f6060ac601
1 changed files with 34 additions and 6 deletions
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40
tools/perf/util/thread-stack.c
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@ -60,6 +60,7 @@ struct thread_stack_entry {
* @last_time: last timestamp
* @crp: call/return processor
* @comm: current comm
* @arr_sz: size of array if this is the first element of an array
*/
struct thread_stack {
struct thread_stack_entry *stack;
@ -71,6 +72,7 @@ struct thread_stack {
u64 last_time;
struct call_return_processor *crp;
struct comm *comm;
unsigned int arr_sz;
};
static int thread_stack__grow(struct thread_stack *ts)
@ -100,6 +102,8 @@ static struct thread_stack *thread_stack__new(struct thread *thread,
if (!ts)
return NULL;
ts->arr_sz = 1;
if (thread_stack__grow(ts)) {
free(ts);
return NULL;
@ -234,11 +238,19 @@ static int __thread_stack__flush(struct thread *thread, struct thread_stack *ts)
int thread_stack__flush(struct thread *thread)
{
struct thread_stack *ts = thread->ts;
unsigned int pos;
int err = 0;
if (ts)
return __thread_stack__flush(thread, ts);
if (ts) {
for (pos = 0; pos < ts->arr_sz; pos++) {
int ret = __thread_stack__flush(thread, ts + pos);
return 0;
if (ret)
err = ret;
}
}
return err;
}
int thread_stack__event(struct thread *thread, u32 flags, u64 from_ip,
@ -314,13 +326,29 @@ void thread_stack__set_trace_nr(struct thread *thread, u64 trace_nr)
}
}
static void __thread_stack__free(struct thread *thread, struct thread_stack *ts)
{
__thread_stack__flush(thread, ts);
zfree(&ts->stack);
}
static void thread_stack__reset(struct thread *thread, struct thread_stack *ts)
{
unsigned int arr_sz = ts->arr_sz;
__thread_stack__free(thread, ts);
memset(ts, 0, sizeof(*ts));
ts->arr_sz = arr_sz;
}
void thread_stack__free(struct thread *thread)
{
struct thread_stack *ts = thread->ts;
unsigned int pos;
if (ts) {
__thread_stack__flush(thread, ts);
zfree(&ts->stack);
for (pos = 0; pos < ts->arr_sz; pos++)
__thread_stack__free(thread, ts + pos);
zfree(&thread->ts);
}
}
@ -611,7 +639,7 @@ int thread_stack__process(struct thread *thread, struct comm *comm,
if (ts && !ts->crp) {
/* Supersede thread_stack__event() */
thread_stack__free(thread);
thread_stack__reset(thread, ts);
ts = NULL;
}