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perf thread-stack: Allocate an array of thread stacks

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In preparation for fixing thread stack processing for the idle task,
allocate an array of thread stacks.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Link: http://lkml.kernel.org/r/20181221120620.9659-7-adrian.hunter@intel.com
[ No need to check for NULL when calling zfree(), noticed by Jiri Olsa ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2018-12-21 14:06:18 +02:00 committed by Arnaldo Carvalho de Melo
parent 2e9e868876
commit 139f42f3b3
1 changed files with 16 additions and 11 deletions
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27
tools/perf/util/thread-stack.c
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@ -114,20 +114,25 @@ static int thread_stack__init(struct thread_stack *ts, struct thread *thread,
static struct thread_stack *thread_stack__new(struct thread *thread,
struct call_return_processor *crp)
{
struct thread_stack *ts;
struct thread_stack *ts = thread->ts, *new_ts;
unsigned int old_sz = ts ? ts->arr_sz : 0;
unsigned int new_sz = 1;
ts = zalloc(sizeof(struct thread_stack));
if (!ts)
return NULL;
ts->arr_sz = 1;
if (thread_stack__init(ts, thread, crp)) {
free(ts);
return NULL;
if (!ts || new_sz > old_sz) {
new_ts = calloc(new_sz, sizeof(*ts));
if (!new_ts)
return NULL;
if (ts)
memcpy(new_ts, ts, old_sz * sizeof(*ts));
new_ts->arr_sz = new_sz;
zfree(&thread->ts);
thread->ts = new_ts;
ts = new_ts;
}
thread->ts = ts;
if (!ts->stack &&
thread_stack__init(ts, thread, crp))
return NULL;
return ts;
}