diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2018-12-21 15:06:18 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-01-02 16:55:55 +0300 |
| commit | 139f42f3b3b495e61bb2cfef40e1dd5e845e3052 (patch) | |
| tree | 5431e14d34d6c15e8ba4fe23743296c2846aeec1 /tools/perf | |
| parent | 2e9e8688763ff80f032d9a78c3b4b951fb6dd7a4 (diff) | |
| download | linux-139f42f3b3b495e61bb2cfef40e1dd5e845e3052.tar.xz | |
perf thread-stack: Allocate an array of thread stacks
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>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/util/thread-stack.c | 29 |
1 files changed, 17 insertions, 12 deletions
diff --git a/tools/perf/util/thread-stack.c b/tools/perf/util/thread-stack.c index 03770af9e5cd..248ed3945bec 100644 --- a/tools/perf/util/thread-stack.c +++ b/tools/perf/util/thread-stack.c @@ -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; - - 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; + struct thread_stack *ts = thread->ts, *new_ts; + unsigned int old_sz = ts ? ts->arr_sz : 0; + unsigned int new_sz = 1; + + 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; } |