[PATCH v2 06/11] perf stat: introduce --ctl-fd[-ack] options

[Alexey Budankov]

Introduce --ctl-fd[-ack] options to pass open file descriptors
numbers from command line.

Signed-off-by: Alexey Budankov <alexey.budan...@linux.intel.com>
---
 tools/perf/builtin-stat.c | 10 ++++++++++
 tools/perf/util/stat.h    |  2 ++
 2 files changed, 12 insertions(+)

diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 5aab3ff1bbea..60c0d9521f74 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -187,6 +187,8 @@ static struct perf_stat_config stat_config = {
        .metric_only_len        = METRIC_ONLY_LEN,
        .walltime_nsecs_stats   = &walltime_nsecs_stats,
        .big_num                = true,
+       .ctl_fd                 = -1,
+       .ctl_fd_ack             = -1
 };
 
 static inline void diff_timespec(struct timespec *r, struct timespec *a,
@@ -984,6 +986,10 @@ static struct option stat_options[] = {
                    "Use with 'percore' event qualifier to show the event "
                    "counts of one hardware thread by sum up total hardware "
                    "threads of same physical core"),
+       OPT_INTEGER(0, "ctl-fd", &stat_config.ctl_fd,
+                   "Listen on fd descriptor for command to control measurement 
('e': enable events, 'd': disable events)"),
+       OPT_INTEGER(0, "ctl-fd-ack", &stat_config.ctl_fd_ack,
+                   "Send control command completion ('a') to fd ack 
descriptor"),
        OPT_END()
 };
 
@@ -2180,6 +2186,8 @@ int cmd_stat(int argc, const char **argv)
        signal(SIGALRM, skip_signal);
        signal(SIGABRT, skip_signal);
 
+       perf_evlist__initialize_ctlfd(evsel_list, stat_config.ctl_fd, 
stat_config.ctl_fd_ack);
+
        status = 0;
        for (run_idx = 0; forever || run_idx < stat_config.run_count; 
run_idx++) {
                if (stat_config.run_count != 1 && verbose > 0)
@@ -2199,6 +2207,8 @@ int cmd_stat(int argc, const char **argv)
        if (!forever && status != -1 && !interval)
                print_counters(NULL, argc, argv);
 
+       perf_evlist__finalize_ctlfd(evsel_list);
+
        if (STAT_RECORD) {
                /*
                 * We synthesize the kernel mmap record just so that older tools
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index 027b9dcd902f..0b0fa3a2cde2 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -130,6 +130,8 @@ struct perf_stat_config {
        struct perf_cpu_map             *cpus_aggr_map;
        u64                     *walltime_run;
        struct rblist            metric_events;
+       int                      ctl_fd;
+       int                      ctl_fd_ack;
 };
 
 void update_stats(struct stats *stats, u64 val);
-- 
2.24.1