linux-kernel - [PATCH v3 2/2] tracing: Remove pid in task

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Message-ID: <20241108113455.2924361-2-elver@google.com>
Date: Fri,  8 Nov 2024 12:34:25 +0100
From: Marco Elver <elver@...gle.com>
To: elver@...gle.com, Steven Rostedt <rostedt@...dmis.org>, 
	Kees Cook <keescook@...omium.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
	Andrew Morton <akpm@...ux-foundation.org>, Oleg Nesterov <oleg@...hat.com>, 
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org, 
	Dmitry Vyukov <dvyukov@...gle.com>, kasan-dev@...glegroups.com
Subject: [PATCH v3 2/2] tracing: Remove pid in task_rename tracing output

Remove pid in task_rename tracepoint output, since that tracepoint only
deals with the current task, and is printed by default. This also saves
some space in the entry and avoids wasted padding.

Link: https://lkml.kernel.org/r/20241105120247.596a0dc9@gandalf.local.home
Suggested-by: Steven Rostedt <rostedt@...dmis.org>
Signed-off-by: Marco Elver <elver@...gle.com>
---
v2:
* New patch
---
 include/trace/events/task.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/include/trace/events/task.h b/include/trace/events/task.h
index 209d315852fb..af535b053033 100644
--- a/include/trace/events/task.h
+++ b/include/trace/events/task.h
@@ -38,22 +38,19 @@ TRACE_EVENT(task_rename,
 	TP_ARGS(task, comm),
 
 	TP_STRUCT__entry(
-		__field(	pid_t,	pid)
 		__array(	char, oldcomm,  TASK_COMM_LEN)
 		__array(	char, newcomm,  TASK_COMM_LEN)
 		__field(	short,	oom_score_adj)
 	),
 
 	TP_fast_assign(
-		__entry->pid = task->pid;
 		memcpy(entry->oldcomm, task->comm, TASK_COMM_LEN);
 		strscpy(entry->newcomm, comm, TASK_COMM_LEN);
 		__entry->oom_score_adj = task->signal->oom_score_adj;
 	),
 
-	TP_printk("pid=%d oldcomm=%s newcomm=%s oom_score_adj=%hd",
-		__entry->pid, __entry->oldcomm,
-		__entry->newcomm, __entry->oom_score_adj)
+	TP_printk("oldcomm=%s newcomm=%s oom_score_adj=%hd",
+		  __entry->oldcomm, __entry->newcomm, __entry->oom_score_adj)
 );
 
 /**
-- 
2.47.0.277.g8800431eea-goog