linux-kernel - [RFC PATCH 0/5] tracing: Remove conditional locking from tracepoints

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Message-Id: <20241123153031.2884933-1-mathieu.desnoyers@efficios.com>
Date: Sat, 23 Nov 2024 10:30:26 -0500
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Michael Jeanson <mjeanson@...icios.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Yonghong Song <yhs@...com>,
	"Paul E . McKenney" <paulmck@...nel.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Andrii Nakryiko <andrii.nakryiko@...il.com>,
	bpf@...r.kernel.org,
	Joel Fernandes <joel@...lfernandes.org>,
	Jordan Rife <jrife@...gle.com>,
	linux-trace-kernel@...r.kernel.org
Subject: [RFC PATCH 0/5] tracing: Remove conditional locking from tracepoints

Linus pointed out that he was not pleased by the implementation of
faultable syscall tracepoints because it contains conditional locking.
This patch series addresses those concerns.

This is based on commit 06afb0f36106 ("Merge tag 'trace-v6.13' of
git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace")

Many thanks to Linus for the analysis and feedback.

Link: https://lore.kernel.org/lkml/CAHk-=witPrLcu22dZ93VCyRQonS7+-dFYhQbna=KBa-TAhayMw@mail.gmail.com/
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Michael Jeanson <mjeanson@...icios.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Yonghong Song <yhs@...com>
Cc: Paul E. McKenney <paulmck@...nel.org>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Mark Rutland <mark.rutland@....com>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: bpf@...r.kernel.org
Cc: Joel Fernandes <joel@...lfernandes.org>
Cc: Jordan Rife <jrife@...gle.com>
Cc: linux-trace-kernel@...r.kernel.org

Mathieu Desnoyers (5):
  tracing: Move it_func[0] comment to the relevant context
  tracing: Remove __idx variable from __DO_TRACE
  rcupdate_trace: Define rcu_tasks_trace lock guard
  tracing: Remove conditional locking from __DO_TRACE()
  tracing: Remove cond argument from __DECLARE_TRACE_SYSCALL

 include/linux/rcupdate_trace.h |  5 +++
 include/linux/tracepoint.h     | 70 ++++++++++++----------------------
 2 files changed, 29 insertions(+), 46 deletions(-)

-- 
2.39.5