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libperf: Add API for allocating new thread map array

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The existing API perf_thread_map__new_dummy() allocates new thread map
for one thread. I couldn't find a way to reallocate the map with more
threads, or to allocate a new map for more than one thread.

Having multiple threads in a thread map is essential for some use cases.
That's why a new API is proposed, which allocates a new thread map for
given number of threads: perf_thread_map__new_array()

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Ian Rogers <irogers@google.com>
Link: https://lore.kernel.org/linux-perf-users/20220221102628.43904-1-tz.stoyanov@gmail.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tzvetomir Stoyanov (VMware)
2022-02-21 12:26:28 +02:00
committed by Arnaldo Carvalho de Melo
parent 41415b8a97
commit 56dce86819
5 changed files with 62 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

41
tools/lib/perf/tests/test-threadmap.c
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@@ -11,9 +11,43 @@ static int libperf_print(enum libperf_print_level level,
return vfprintf(stderr, fmt, ap);
}
static int test_threadmap_array(int nr, pid_t *array)
{
struct perf_thread_map *threads;
int i;
threads = perf_thread_map__new_array(nr, array);
__T("Failed to allocate new thread map", threads);
__T("Unexpected number of threads", perf_thread_map__nr(threads) == nr);
for (i = 0; i < nr; i++) {
__T("Unexpected initial value of thread",
perf_thread_map__pid(threads, i) == (array ? array[i] : -1));
}
for (i = 1; i < nr; i++)
perf_thread_map__set_pid(threads, i, i * 100);
__T("Unexpected value of thread 0",
perf_thread_map__pid(threads, 0) == (array ? array[0] : -1));
for (i = 1; i < nr; i++) {
__T("Unexpected thread value",
perf_thread_map__pid(threads, i) == i * 100);
}
perf_thread_map__put(threads);
return 0;
}
#define THREADS_NR 10
int test_threadmap(int argc, char **argv)
{
struct perf_thread_map *threads;
pid_t thr_array[THREADS_NR];
int i;
__T_START;
@@ -27,6 +61,13 @@ int test_threadmap(int argc, char **argv)
perf_thread_map__put(threads);
perf_thread_map__put(threads);
test_threadmap_array(THREADS_NR, NULL);
for (i = 0; i < THREADS_NR; i++)
thr_array[i] = i + 100;
test_threadmap_array(THREADS_NR, thr_array);
__T_END;
return tests_failed == 0 ? 0 : -1;
}