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From: Junxuan Liao <ljx@cs.wisc.edu>
To: Frederic Weisbecker <frederic@kernel.org>,
	"Paul E. McKenney" <paulmck@kernel.org>
Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
	Steven Rostedt <rostedt@goodmis.org>,
	Masami Hiramatsu <mhiramat@kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Subject: Interface for enabling context tracking
Date: Thu, 10 Apr 2025 13:51:39 -0500	[thread overview]
Message-ID: <9e2ac1e3-d07d-4f17-970e-6b7a5248a5bb@cs.wisc.edu> (raw)

Hi all,

 From what I can tell, tracepoints context_tracking:user_enter and
user_exit might be useful for performance analysis. e.g. Figuring out how
much time is spent handling page faults or in system calls. However
context tracking is by default inactive and the only way to enable it is
to turn on nohz_full for some CPUs.

Is it a good idea to support turning on and off context tracking through
some interface accessible from the userspace?

Thanks,
Junxuan

             reply	other threads:[~2025-04-10 19:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-04-10 18:51 Junxuan Liao [this message]
2025-04-10 19:05 ` Interface for enabling context tracking Steven Rostedt
2025-04-10 20:31   ` Junxuan Liao
2025-04-17 19:10   ` Junxuan Liao
2025-04-17 20:34     ` Steven Rostedt
2025-04-10 19:10 ` Paul E. McKenney
2025-04-10 19:32   ` Steven Rostedt
2025-04-11 17:41     ` Junxuan Liao
2025-04-11 21:51       ` Frederic Weisbecker

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