aboutsummaryrefslogtreecommitdiffstats
path: root/tools/perf/builtin-stat.c
diff options
context:
space:
mode:
authorStephane Eranian <eranian@google.com>2010-05-28 06:00:01 -0400
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-06-05 08:33:01 -0400
commitc45c6ea2e5c57960dc67e00294c2b78e9540c007 (patch)
tree27c56577862cbb95fb8db4b34cfe99878d5dc9a0 /tools/perf/builtin-stat.c
parent761844b9c68b3c67b085265f92ac0675706cc3b3 (diff)
perf tools: Add the ability to specify list of cpus to monitor
This patch adds a -C option to stat, record, top to designate a list of CPUs to monitor. CPUs can be specified as a comma-separated list or ranges, no space allowed. Examples: $ perf record -a -C0-1,4-7 sleep 1 $ perf top -C0-4 $ perf stat -a -C1,2,3,4 sleep 1 With perf record in per-thread mode with inherit mode on, samples are collected only when the thread runs on the designated CPUs. The -C option does not turn on system-wide mode automatically. Cc: David S. Miller <davem@davemloft.net> Cc: Frédéric Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> LKML-Reference: <4bff9496.d345d80a.41fe.7b00@mx.google.com> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-stat.c')
-rw-r--r--tools/perf/builtin-stat.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 9a39ca3c3ac4..a6b4d44f9502 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -69,7 +69,7 @@ static struct perf_event_attr default_attrs[] = {
69}; 69};
70 70
71static bool system_wide = false; 71static bool system_wide = false;
72static unsigned int nr_cpus = 0; 72static int nr_cpus = 0;
73static int run_idx = 0; 73static int run_idx = 0;
74 74
75static int run_count = 1; 75static int run_count = 1;
@@ -82,6 +82,7 @@ static int thread_num = 0;
82static pid_t child_pid = -1; 82static pid_t child_pid = -1;
83static bool null_run = false; 83static bool null_run = false;
84static bool big_num = false; 84static bool big_num = false;
85static const char *cpu_list;
85 86
86 87
87static int *fd[MAX_NR_CPUS][MAX_COUNTERS]; 88static int *fd[MAX_NR_CPUS][MAX_COUNTERS];
@@ -158,7 +159,7 @@ static int create_perf_stat_counter(int counter)
158 PERF_FORMAT_TOTAL_TIME_RUNNING; 159 PERF_FORMAT_TOTAL_TIME_RUNNING;
159 160
160 if (system_wide) { 161 if (system_wide) {
161 unsigned int cpu; 162 int cpu;
162 163
163 for (cpu = 0; cpu < nr_cpus; cpu++) { 164 for (cpu = 0; cpu < nr_cpus; cpu++) {
164 fd[cpu][counter][0] = sys_perf_event_open(attr, 165 fd[cpu][counter][0] = sys_perf_event_open(attr,
@@ -208,7 +209,7 @@ static inline int nsec_counter(int counter)
208static void read_counter(int counter) 209static void read_counter(int counter)
209{ 210{
210 u64 count[3], single_count[3]; 211 u64 count[3], single_count[3];
211 unsigned int cpu; 212 int cpu;
212 size_t res, nv; 213 size_t res, nv;
213 int scaled; 214 int scaled;
214 int i, thread; 215 int i, thread;
@@ -542,6 +543,8 @@ static const struct option options[] = {
542 "null run - dont start any counters"), 543 "null run - dont start any counters"),
543 OPT_BOOLEAN('B', "big-num", &big_num, 544 OPT_BOOLEAN('B', "big-num", &big_num,
544 "print large numbers with thousands\' separators"), 545 "print large numbers with thousands\' separators"),
546 OPT_STRING('C', "cpu", &cpu_list, "cpu",
547 "list of cpus to monitor in system-wide"),
545 OPT_END() 548 OPT_END()
546}; 549};
547 550
@@ -566,10 +569,13 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
566 } 569 }
567 570
568 if (system_wide) 571 if (system_wide)
569 nr_cpus = read_cpu_map(); 572 nr_cpus = read_cpu_map(cpu_list);
570 else 573 else
571 nr_cpus = 1; 574 nr_cpus = 1;
572 575
576 if (nr_cpus < 1)
577 usage_with_options(stat_usage, options);
578
573 if (target_pid != -1) { 579 if (target_pid != -1) {
574 target_tid = target_pid; 580 target_tid = target_pid;
575 thread_num = find_all_tid(target_pid, &all_tids); 581 thread_num = find_all_tid(target_pid, &all_tids);