linux-kernel - [PATCH v6 0/5] Faultable Tracepoints

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Message-Id: <20240828144153.829582-1-mathieu.desnoyers@efficios.com>
Date: Wed, 28 Aug 2024 10:41:47 -0400
From: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To: Steven Rostedt <rostedt@...dmis.org>,
	Masami Hiramatsu <mhiramat@...nel.org>
Cc: linux-kernel@...r.kernel.org,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	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>,
	bpf@...r.kernel.org,
	Joel Fernandes <joel@...lfernandes.org>,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH v6 0/5] Faultable Tracepoints

Wire up the system call tracepoints with Tasks Trace RCU to allow
the ftrace, perf, and eBPF tracers to handle page faults.

This series does the initial wire-up allowing tracers to handle page
faults, but leaves out the actual handling of said page faults as future
work.

I have tested this against a feature branch of lttng-modules which
implements handling of page faults for the filename argument of the
openat(2) system call.

This v6 rebases v5 on top of v6.11-rc5. It requires the "cleanup.h:
Introduce DEFINE_INACTIVE_GUARD()/activate_guard()" series.

Thanks,

Mathieu

Link: https://lore.kernel.org/lkml/20240828143719.828968-1-mathieu.desnoyers@efficios.com/ # cleanup.h dependency
Link: https://lore.kernel.org/lkml/20240627152340.82413-1-mathieu.desnoyers@efficios.com/ # v5
Link: https://lore.kernel.org/lkml/20231120205418.334172-1-mathieu.desnoyers@efficios.com/
Link: https://lore.kernel.org/lkml/e4e9a2bc-1776-4b51-aba4-a147795a5de1@efficios.com/
Link: https://lore.kernel.org/lkml/a0ac5f77-411e-4562-9863-81196238f3f5@efficios.com/
Link: https://lore.kernel.org/lkml/ba543d44-9302-4115-ac4f-d4e9f8d98a90@paulmck-laptop/
Link: https://lore.kernel.org/lkml/20231120221524.GD8262@noisy.programming.kicks-ass.net/
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: bpf@...r.kernel.org
Cc: Joel Fernandes <joel@...lfernandes.org>
Cc: linux-trace-kernel@...r.kernel.org

Mathieu Desnoyers (5):
  tracing: Introduce faultable tracepoints
  tracing/ftrace: Add support for faultable tracepoints
  tracing/bpf-trace: Add support for faultable tracepoints
  tracing/perf: Add support for faultable tracepoints
  tracing: Convert sys_enter/exit to faultable tracepoints

 include/linux/tracepoint-defs.h | 14 ++++++
 include/linux/tracepoint.h      | 88 +++++++++++++++++++++++----------
 include/trace/bpf_probe.h       | 21 ++++++--
 include/trace/define_trace.h    |  7 +++
 include/trace/events/syscalls.h |  4 +-
 include/trace/perf.h            | 22 ++++++++-
 include/trace/trace_events.h    | 68 ++++++++++++++++++++++++-
 init/Kconfig                    |  1 +
 kernel/trace/bpf_trace.c        |  4 +-
 kernel/trace/trace_events.c     | 16 +++---
 kernel/trace/trace_fprobe.c     |  5 +-
 kernel/trace/trace_syscalls.c   | 52 ++++++++++++++++---
 kernel/tracepoint.c             | 65 ++++++++++++++----------
 13 files changed, 288 insertions(+), 79 deletions(-)

-- 
2.39.2