linux-kernel - [PATCH v5 10/15] tools/lib/perf: use TASK_COMM_LEN

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Date:   Thu, 21 Oct 2021 03:45:58 +0000
From:   Yafang Shao <laoar.shao@...il.com>
To:     keescook@...omium.org, rostedt@...dmis.org,
        mathieu.desnoyers@...icios.com, arnaldo.melo@...il.com,
        pmladek@...e.com, peterz@...radead.org, viro@...iv.linux.org.uk,
        akpm@...ux-foundation.org, valentin.schneider@....com,
        qiang.zhang@...driver.com, robdclark@...omium.org,
        christian@...uner.io, dietmar.eggemann@....com, mingo@...hat.com,
        juri.lelli@...hat.com, vincent.guittot@...aro.org,
        davem@...emloft.net, kuba@...nel.org, ast@...nel.org,
        daniel@...earbox.net, andrii@...nel.org, kafai@...com,
        songliubraving@...com, yhs@...com, john.fastabend@...il.com,
        kpsingh@...nel.org
Cc:     netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-perf-users@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, oliver.sang@...el.com, lkp@...el.com,
        Yafang Shao <laoar.shao@...il.com>
Subject: [PATCH v5 10/15] tools/lib/perf: use TASK_COMM_LEN_16 instead of hard-coded 16

Use TASK_COMM_LEN_16 instead of hard-coded 16 to make it more grepable.
The comm is set in perf_event__prepare_comm(), which makes the comm
always a nul terminated string, so we don't worry about whether it will
be truncated or not.

Signed-off-by: Yafang Shao <laoar.shao@...il.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Kees Cook <keescook@...omium.org>
Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Petr Mladek <pmladek@...e.com>
---
 tools/lib/perf/include/perf/event.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/tools/lib/perf/include/perf/event.h b/tools/lib/perf/include/perf/event.h
index 4d0c02ba3f7d..ab22b4e570c6 100644
--- a/tools/lib/perf/include/perf/event.h
+++ b/tools/lib/perf/include/perf/event.h
@@ -6,6 +6,7 @@
 #include <linux/types.h>
 #include <linux/limits.h>
 #include <linux/bpf.h>
+#include <linux/sched/task.h>
 #include <sys/types.h> /* pid_t */
 
 #define event_contains(obj, mem) ((obj).header.size > offsetof(typeof(obj), mem))
@@ -47,7 +48,7 @@ struct perf_record_mmap2 {
 struct perf_record_comm {
 	struct perf_event_header header;
 	__u32			 pid, tid;
-	char			 comm[16];
+	char			 comm[TASK_COMM_LEN_16];
 };
 
 struct perf_record_namespaces {
@@ -291,7 +292,7 @@ struct perf_record_itrace_start {
 
 struct perf_record_thread_map_entry {
 	__u64			 pid;
-	char			 comm[16];
+	char			 comm[TASK_COMM_LEN_16];
 };
 
 struct perf_record_thread_map {
-- 
2.17.1