perf evlist: Introduce control file descriptors

Define and initialize control file descriptors.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/0dd4f544-2610-96d6-1bdb-6582bdc3dc2c@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 22a33a4..82d0025 100644 (file)
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -63,6 +63,9 @@ void evlist__init(struct evlist *evlist, struct perf_cpu_map *cpus,
        perf_evlist__set_maps(&evlist->core, cpus, threads);
        evlist->workload.pid = -1;
        evlist->bkw_mmap_state = BKW_MMAP_NOTREADY;
+       evlist->ctl_fd.fd = -1;
+       evlist->ctl_fd.ack = -1;
+       evlist->ctl_fd.pos = -1;
 }
 
 struct evlist *evlist__new(void)

diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 6ea4d08..3510af0 100644 (file)
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -74,6 +74,11 @@ struct evlist {
                pthread_t               th;
                volatile int            done;
        } thread;
+       struct {
+               int     fd;     /* control file descriptor */
+               int     ack;    /* ack file descriptor for control commands */
+               int     pos;    /* index at evlist core object to check signals */
+       } ctl_fd;
 };
 
 struct evsel_str_handler {