linux-kernel - [tip:perf/core] perf top: Set display thread COMM to help with debugging

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Message-ID: <tip-5w0hmlk3zfvysxvpsh763k9w@git.kernel.org>
Date:   Thu, 15 Aug 2019 02:20:54 -0700
From:   tip-bot for Arnaldo Carvalho de Melo <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, namhyung@...nel.org,
        adrian.hunter@...el.com, hpa@...or.com, jolsa@...nel.org,
        acme@...hat.com, tglx@...utronix.de, mingo@...nel.org
Subject: [tip:perf/core] perf top: Set display thread COMM to help with
 debugging

Commit-ID:  1205a2719e52b6b52e0f9c0011554419da0377a0
Gitweb:     https://git.kernel.org/tip/1205a2719e52b6b52e0f9c0011554419da0377a0
Author:     Arnaldo Carvalho de Melo <acme@...hat.com>
AuthorDate: Tue, 6 Aug 2019 11:20:42 -0300
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 12 Aug 2019 16:26:02 -0300

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@...el.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Link: https://lkml.kernel.org/n/tip-5w0hmlk3zfvysxvpsh763k9w@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/builtin-top.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 1a4615a5f6c9..94e34853a238 100644
--- 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: