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Diffstat (limited to 'tools/lib/perf/evlist.c')
-rw-r--r--tools/lib/perf/evlist.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/tools/lib/perf/evlist.c b/tools/lib/perf/evlist.c
index e6c98a6e3908..6b1bafe267a4 100644
--- a/tools/lib/perf/evlist.c
+++ b/tools/lib/perf/evlist.c
@@ -486,6 +486,7 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
if (ops->idx)
ops->idx(evlist, evsel, mp, idx);
+ pr_debug("idx %d: mmapping fd %d\n", idx, *output);
if (ops->mmap(map, mp, *output, evlist_cpu) < 0)
return -1;
@@ -494,6 +495,7 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
if (!idx)
perf_evlist__set_mmap_first(evlist, map, overwrite);
} else {
+ pr_debug("idx %d: set output fd %d -> %d\n", idx, fd, *output);
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
return -1;
@@ -520,6 +522,48 @@ mmap_per_evsel(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
}
static int
+mmap_per_thread(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
+ struct perf_mmap_param *mp)
+{
+ int nr_threads = perf_thread_map__nr(evlist->threads);
+ int nr_cpus = perf_cpu_map__nr(evlist->all_cpus);
+ int cpu, thread, idx = 0;
+ int nr_mmaps = 0;
+
+ pr_debug("%s: nr cpu values (may include -1) %d nr threads %d\n",
+ __func__, nr_cpus, nr_threads);
+
+ /* per-thread mmaps */
+ for (thread = 0; thread < nr_threads; thread++, idx++) {
+ int output = -1;
+ int output_overwrite = -1;
+
+ if (mmap_per_evsel(evlist, ops, idx, mp, 0, thread, &output,
+ &output_overwrite, &nr_mmaps))
+ goto out_unmap;
+ }
+
+ /* system-wide mmaps i.e. per-cpu */
+ for (cpu = 1; cpu < nr_cpus; cpu++, idx++) {
+ int output = -1;
+ int output_overwrite = -1;
+
+ if (mmap_per_evsel(evlist, ops, idx, mp, cpu, 0, &output,
+ &output_overwrite, &nr_mmaps))
+ goto out_unmap;
+ }
+
+ if (nr_mmaps != evlist->nr_mmaps)
+ pr_err("Miscounted nr_mmaps %d vs %d\n", nr_mmaps, evlist->nr_mmaps);
+
+ return 0;
+
+out_unmap:
+ perf_evlist__munmap(evlist);
+ return -1;
+}
+
+static int
mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
struct perf_mmap_param *mp)
{
@@ -528,6 +572,8 @@ mmap_per_cpu(struct perf_evlist *evlist, struct perf_evlist_mmap_ops *ops,
int nr_mmaps = 0;
int cpu, thread;
+ pr_debug("%s: nr cpu values %d nr threads %d\n", __func__, nr_cpus, nr_threads);
+
for (cpu = 0; cpu < nr_cpus; cpu++) {
int output = -1;
int output_overwrite = -1;
@@ -569,6 +615,7 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist,
struct perf_evlist_mmap_ops *ops,
struct perf_mmap_param *mp)
{
+ const struct perf_cpu_map *cpus = evlist->all_cpus;
struct perf_evsel *evsel;
if (!ops || !ops->get || !ops->mmap)
@@ -588,6 +635,9 @@ int perf_evlist__mmap_ops(struct perf_evlist *evlist,
if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
return -ENOMEM;
+ if (perf_cpu_map__empty(cpus))
+ return mmap_per_thread(evlist, ops, mp);
+
return mmap_per_cpu(evlist, ops, mp);
}