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Message-ID: <tencent_5CD40341EC9384E9B7CC127EA5CF2655B408@qq.com>
Date: Sat, 17 Feb 2024 02:59:47 +0800
From: wenyang.linux@...mail.com
To: Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Ingo Molnar <mingo@...nel.org>
Cc: Wen Yang <wenyang.linux@...mail.com>,
Oleg Nesterov <oleg@...hat.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Mel Gorman <mgorman@...hsingularity.net>,
Peter Zijlstra <peterz@...radead.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH] coredump debugging: add a tracepoint to report the coredumping
From: Wen Yang <wenyang.linux@...mail.com>
Currently coredump_task_exit() takes some time to wait for the generation
of the dump file. But if the user-space wants to receive a notification
as soon as possible it maybe inconvenient.
Add the new trace_sched_process_coredump() into coredump_task_exit(),
this way a user-space monitor could easily wait for the exits and
potentially make some preparations in advance.
Signed-off-by: Wen Yang <wenyang.linux@...mail.com>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org
---
include/trace/events/sched.h | 7 +++++++
kernel/exit.c | 1 +
2 files changed, 8 insertions(+)
diff --git a/include/trace/events/sched.h b/include/trace/events/sched.h
index dbb01b4b7451..ce7448065986 100644
--- a/include/trace/events/sched.h
+++ b/include/trace/events/sched.h
@@ -334,6 +334,13 @@ DEFINE_EVENT(sched_process_template, sched_process_exit,
TP_PROTO(struct task_struct *p),
TP_ARGS(p));
+/*
+ * Tracepoint for a task coredumping:
+ */
+DEFINE_EVENT(sched_process_template, sched_process_coredump,
+ TP_PROTO(struct task_struct *p),
+ TP_ARGS(p));
+
/*
* Tracepoint for waiting on task to unschedule:
*/
diff --git a/kernel/exit.c b/kernel/exit.c
index 493647fd7c07..c11e12d73f4e 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -425,6 +425,7 @@ static void coredump_task_exit(struct task_struct *tsk)
self.next = xchg(&core_state->dumper.next, &self);
else
self.task = NULL;
+ trace_sched_process_coredump(tsk);
/*
* Implies mb(), the result of xchg() must be visible
* to core_state->dumper.
--
2.25.1
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