By default, when tasks are specified (i.e. -p, -t
or -u options) per-thread mmaps are created. Add
an option to override that and force per-cpu mmaps.
Signed-off-by: Adrian Hunter <adrian.hun...@intel.com>
---
tools/perf/Documentation/perf-record.txt | 6 ++++++
tools/perf/builtin-record.c | 2 ++
tools/perf/util/evlist.c | 4 +++-
tools/perf/util/evsel.c | 4 ++--
tools/perf/util/target.h | 1 +
5 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/tools/perf/Documentation/perf-record.txt
b/tools/perf/Documentation/perf-record.txt
index f10ab63..2ea6685 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -189,6 +189,12 @@ abort events and some memory events in precise mode on
modern Intel CPUs.
--transaction::
Record transaction flags for transaction related events.
+--force-per-cpu::
+Force the use of per-cpu mmaps. By default, when tasks are specified (i.e. -p,
+-t or -u options) per-thread mmaps are created. This option overrides that and
+forces per-cpu mmaps. A side-effect of that is that inheritance is
+automatically enabled. Add the -i option also to disable inheritance.
+
SEE ALSO
--------
linkperf:perf-stat[1], linkperf:perf-list[1]
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index ab8d15e..4c0657f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -860,6 +860,8 @@ const struct option record_options[] = {
"sample by weight (on special events only)"),
OPT_BOOLEAN(0, "transaction", &record.opts.sample_transaction,
"sample transaction flags (special events only)"),
+ OPT_BOOLEAN(0, "force-per-cpu", &record.opts.target.force_per_cpu,
+ "force the use of per-cpu mmaps"),
OPT_END()
};
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 1c173cc..b3183d5 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -805,7 +805,9 @@ int perf_evlist__create_maps(struct perf_evlist *evlist,
if (evlist->threads == NULL)
return -1;
- if (perf_target__has_task(target))
+ if (target->force_per_cpu)
+ evlist->cpus = cpu_map__new(target->cpu_list);
+ else if (perf_target__has_task(target))
evlist->cpus = cpu_map__dummy_new();
else if (!perf_target__has_cpu(target) && !target->uses_mmap)
evlist->cpus = cpu_map__dummy_new();
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index e09c7e6..f1839b0 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -645,7 +645,7 @@ void perf_evsel__config(struct perf_evsel *evsel,
}
}
- if (perf_target__has_cpu(&opts->target))
+ if (perf_target__has_cpu(&opts->target) || opts->target.force_per_cpu)
perf_evsel__set_sample_bit(evsel, CPU);
if (opts->period)
@@ -653,7 +653,7 @@ void perf_evsel__config(struct perf_evsel *evsel,
if (!perf_missing_features.sample_id_all &&
(opts->sample_time || !opts->no_inherit ||
- perf_target__has_cpu(&opts->target)))
+ perf_target__has_cpu(&opts->target) || opts->target.force_per_cpu))
perf_evsel__set_sample_bit(evsel, TIME);
if (opts->raw_samples) {
diff --git a/tools/perf/util/target.h b/tools/perf/util/target.h
index a4be857..6d7efbd 100644
--- a/tools/perf/util/target.h
+++ b/tools/perf/util/target.h
@@ -12,6 +12,7 @@ struct perf_target {
uid_t uid;
bool system_wide;
bool uses_mmap;
+ bool force_per_cpu;
};
enum perf_target_errno {
--
1.7.11.7
--
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