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authorJiri Olsa <jolsa@kernel.org>2015-06-26 12:29:07 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-06-26 17:07:01 +0300
commit792402fd5c0a5a5300868e9dfc8ee569f3a39169 (patch)
treeebb6df248a2b15b81b7fe8a0ac5e9f02a4ad6412 /tools/perf/util/thread_map.c
parent62eea464380633b88902da35bf9cbd8515289703 (diff)
downloadlinux-792402fd5c0a5a5300868e9dfc8ee569f3a39169.tar.xz
perf thrad_map: Add comm string into array
Adding support to hold comm name together with pids in 'struct thread_map'. It will be useful for --per-thread option to display task pid together with task name. Adding thread_map__read_comms function that reads/set comm string for the 'struct thread_map'. Getting the task name from /proc/$pid/comm. Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1435310967-14570-3-git-send-email-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/thread_map.c')
-rw-r--r--tools/perf/util/thread_map.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/tools/perf/util/thread_map.c b/tools/perf/util/thread_map.c
index ed76c179cf4e..da7646d767fe 100644
--- a/tools/perf/util/thread_map.c
+++ b/tools/perf/util/thread_map.c
@@ -8,9 +8,11 @@
#include <unistd.h>
#include "strlist.h"
#include <string.h>
+#include <api/fs/fs.h>
#include "asm/bug.h"
#include "thread_map.h"
#include "util.h"
+#include "debug.h"
/* Skip "." and ".." directories */
static int filter(const struct dirent *dir)
@@ -319,8 +321,12 @@ struct thread_map *thread_map__new_str(const char *pid, const char *tid,
static void thread_map__delete(struct thread_map *threads)
{
if (threads) {
+ int i;
+
WARN_ONCE(atomic_read(&threads->refcnt) != 0,
"thread map refcnt unbalanced\n");
+ for (i = 0; i < threads->nr; i++)
+ free(thread_map__comm(threads, i));
free(threads);
}
}
@@ -348,3 +354,56 @@ size_t thread_map__fprintf(struct thread_map *threads, FILE *fp)
return printed + fprintf(fp, "\n");
}
+
+static int get_comm(char **comm, pid_t pid)
+{
+ char *path;
+ size_t size;
+ int err;
+
+ if (asprintf(&path, "%s/%d/comm", procfs__mountpoint(), pid) == -1)
+ return -ENOMEM;
+
+ err = filename__read_str(path, comm, &size);
+ if (!err) {
+ /*
+ * We're reading 16 bytes, while filename__read_str
+ * allocates data per BUFSIZ bytes, so we can safely
+ * mark the end of the string.
+ */
+ (*comm)[size] = 0;
+ rtrim(*comm);
+ }
+
+ free(path);
+ return err;
+}
+
+static void comm_init(struct thread_map *map, int i)
+{
+ pid_t pid = thread_map__pid(map, i);
+ char *comm = NULL;
+
+ /* dummy pid comm initialization */
+ if (pid == -1) {
+ map->map[i].comm = strdup("dummy");
+ return;
+ }
+
+ /*
+ * The comm name is like extra bonus ;-),
+ * so just warn if we fail for any reason.
+ */
+ if (get_comm(&comm, pid))
+ pr_warning("Couldn't resolve comm name for pid %d\n", pid);
+
+ map->map[i].comm = comm;
+}
+
+void thread_map__read_comms(struct thread_map *threads)
+{
+ int i;
+
+ for (i = 0; i < threads->nr; ++i)
+ comm_init(threads, i);
+}