perf tools: Add the ability to specify list of cpus to monitor

[pandora-kernel.git] / tools / perf / builtin-stat.c

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9a39ca3..a6b4d44 100644 (file)
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -69,7 +69,7 @@ static struct perf_event_attr default_attrs[] = {
 };
 
 static bool                    system_wide                     =  false;
-static unsigned int            nr_cpus                         =  0;
+static int                     nr_cpus                         =  0;
 static int                     run_idx                         =  0;
 
 static int                     run_count                       =  1;
@@ -82,6 +82,7 @@ static int                    thread_num                      =  0;
 static pid_t                   child_pid                       = -1;
 static bool                    null_run                        =  false;
 static bool                    big_num                         =  false;
+static const char              *cpu_list;
 
 
 static int                     *fd[MAX_NR_CPUS][MAX_COUNTERS];
@@ -158,7 +159,7 @@ static int create_perf_stat_counter(int counter)
                                    PERF_FORMAT_TOTAL_TIME_RUNNING;
 
        if (system_wide) {
-               unsigned int cpu;
+               int cpu;
 
                for (cpu = 0; cpu < nr_cpus; cpu++) {
                        fd[cpu][counter][0] = sys_perf_event_open(attr,
@@ -208,7 +209,7 @@ static inline int nsec_counter(int counter)
 static void read_counter(int counter)
 {
        u64 count[3], single_count[3];
-       unsigned int cpu;
+       int cpu;
        size_t res, nv;
        int scaled;
        int i, thread;
@@ -542,6 +543,8 @@ static const struct option options[] = {
                    "null run - dont start any counters"),
        OPT_BOOLEAN('B', "big-num", &big_num,
                    "print large numbers with thousands\' separators"),
+       OPT_STRING('C', "cpu", &cpu_list, "cpu",
+                   "list of cpus to monitor in system-wide"),
        OPT_END()
 };
 
@@ -566,10 +569,13 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
        }
 
        if (system_wide)
-               nr_cpus = read_cpu_map();
+               nr_cpus = read_cpu_map(cpu_list);
        else
                nr_cpus = 1;
 
+       if (nr_cpus < 1)
+               usage_with_options(stat_usage, options);
+
        if (target_pid != -1) {
                target_tid = target_pid;
                thread_num = find_all_tid(target_pid, &all_tids);