perf top: Set display thread COMM to help with debugging

When we want to attach just to the thread that updates the display it
helps having its COMM stand out, so change it from the default "perf" to
"perf-top-UI".

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-5w0hmlk3zfvysxvpsh763k9w@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 1a4615a5f6c9d088d26383e10e7983dfdebc24f2..94e34853a2380a61590b37482a6754ab2be43cf0 100644 (file)
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -601,6 +601,8 @@ static void *display_thread_tui(void *arg)
         */
        unshare(CLONE_FS);
 
+       prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
+
        perf_top__sort_new_samples(top);
 
        /*
@@ -651,6 +653,8 @@ static void *display_thread(void *arg)
         */
        unshare(CLONE_FS);
 
+       prctl(PR_SET_NAME, "perf-top-UI", 0, 0, 0);
+
        display_setup_sig();
        pthread__unblock_sigwinch();
 repeat: