From: Kan Liang <kan.li...@intel.com>
Using UINT_MAX to indicate the default thread#, which is the max number
of online CPU.
Signed-off-by: Kan Liang <kan.li...@intel.com>
---
tools/perf/Documentation/perf-top.txt | 3 +++
tools/perf/builtin-top.c | 11 ++++++++---
tools/perf/util/event.c | 5 ++++-
tools/perf/util/top.h | 1 +
4 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/tools/perf/Documentation/perf-top.txt
b/tools/perf/Documentation/perf-top.txt
index d864ea6..c3cc9a3 100644
--- a/tools/perf/Documentation/perf-top.txt
+++ b/tools/perf/Documentation/perf-top.txt
@@ -240,6 +240,9 @@ Default is to monitor all CPUS.
--force::
Don't do ownership validation.
+--num-thread-synthesize::
+ The number of threads to run event synthesize.
+ By default, the number of threads equals to the online CPU number.
INTERACTIVE PROMPTING KEYS
--------------------------
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index bc31b93..477a869 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -958,14 +958,16 @@ static int __cmd_top(struct perf_top *top)
if (perf_session__register_idle_thread(top->session) < 0)
goto out_delete;
- perf_set_multithreaded();
+ if (top->nr_threads_synthesize > 1)
+ perf_set_multithreaded();
machine__synthesize_threads(&top->session->machines.host, &opts->target,
top->evlist->threads, false,
opts->proc_map_timeout,
- (unsigned
int)sysconf(_SC_NPROCESSORS_ONLN));
+ top->nr_threads_synthesize);
- perf_set_singlethreaded();
+ if (top->nr_threads_synthesize > 1)
+ perf_set_singlethreaded();
if (perf_hpp_list.socket) {
ret = perf_env__read_cpu_topology_map(&perf_env);
@@ -1118,6 +1120,7 @@ int cmd_top(int argc, const char **argv)
},
.max_stack = sysctl_perf_event_max_stack,
.sym_pcnt_filter = 5,
+ .nr_threads_synthesize = UINT_MAX,
};
struct record_opts *opts = &top.record_opts;
struct target *target = &opts->target;
@@ -1227,6 +1230,8 @@ int cmd_top(int argc, const char **argv)
OPT_BOOLEAN(0, "hierarchy", &symbol_conf.report_hierarchy,
"Show entries in a hierarchy"),
OPT_BOOLEAN(0, "force", &symbol_conf.force, "don't complain, do it"),
+ OPT_UINTEGER(0, "num-thread-synthesize", &top.nr_threads_synthesize,
+ "number of thread to run event synthesize"),
OPT_END()
};
const char * const top_usage[] = {
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 0e678dd..47eff47 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -790,7 +790,10 @@ int perf_event__synthesize_threads(struct perf_tool *tool,
if (n < 0)
return err;
- thread_nr = nr_threads_synthesize;
+ if (nr_threads_synthesize == UINT_MAX)
+ thread_nr = sysconf(_SC_NPROCESSORS_ONLN);
+ else
+ thread_nr = nr_threads_synthesize;
if (thread_nr <= 1) {
err = __perf_event__synthesize_threads(tool, process,
diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index 9bdfb78..f4296e1 100644
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -37,6 +37,7 @@ struct perf_top {
int sym_pcnt_filter;
const char *sym_filter;
float min_percent;
+ unsigned int nr_threads_synthesize;
};
#define CONSOLE_CLEAR "[H[2J"
--
2.5.5
