From: Namhyung Kim <namhyung....@lge.com>
The -a/--all-cpus and -C/--cpu option is for controlling tracing cpus.
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Signed-off-by: Namhyung Kim <namhy...@kernel.org>
---
tools/perf/builtin-ftrace.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index 2025161bbaed..04ca2303b63b 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -18,6 +18,7 @@
#include "util/evlist.h"
#include "util/target.h"
#include "util/thread_map.h"
+#include "util/cpumap.h"
#define DEFAULT_TRACER "function_graph"
@@ -110,6 +111,26 @@ static int set_tracing_pid(struct perf_ftrace *ftrace)
return 0;
}
+static int set_tracing_cpu(struct perf_ftrace *ftrace)
+{
+ int i;
+ unsigned long cpumask = 0;
+ char cpumask_str[sizeof(cpumask)*2 + 1];
+
+ if (!perf_target__has_cpu(&ftrace->target))
+ return 0;
+
+ for (i = 0; i < cpu_map__nr(ftrace->evlist->cpus); i++)
+ cpumask |= 1 << ftrace->evlist->cpus->map[i];
+
+ scnprintf(cpumask_str, sizeof(cpumask_str), "%lx", cpumask);
+
+ if (write_tracing_file("tracing_cpumask", cpumask_str) < 0)
+ return -1;
+
+ return 0;
+}
+
static int __cmd_ftrace(struct perf_ftrace *ftrace, int argc, const char
**argv)
{
char *trace_file;
@@ -146,6 +167,11 @@ static int __cmd_ftrace(struct perf_ftrace *ftrace, int
argc, const char **argv)
goto out_reset;
}
+ if (set_tracing_cpu(ftrace) < 0) {
+ pr_err("failed to set tracing cpumask\n");
+ goto out_reset;
+ }
+
if (write_tracing_file("current_tracer", ftrace->tracer) < 0) {
pr_err("failed to set current_tracer to %s\n", ftrace->tracer);
goto out_reset;
@@ -226,6 +252,10 @@ int cmd_ftrace(int argc, const char **argv, const char
*prefix __maybe_unused)
"trace on existing process id"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose"),
+ OPT_BOOLEAN('a', "all-cpus", &ftrace.target.system_wide,
+ "system-wide collection from all CPUs"),
+ OPT_STRING('C', "cpu", &ftrace.target.cpu_list, "cpu",
+ "list of cpus to monitor"),
OPT_END()
};
--
1.7.11.7
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