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 v5 addresses comments from the previous round of review [1]. Steven Rostedt suggested separating tracepoints into two separate sections. It is unclear how that approach would prove to be an improvement over the currently proposed approach, so those changes were not incorporated. See [2] for my detailed reply. In the previous round, Peter Zijlstra suggested use of SRCU rather than Tasks Trace RCU. See my reply about the distinction between SRCU and Tasks Trace RCU [3] and this explanation from Paul E. McKenney about the purpose of Tasks Trace RCU [4]. The macros DEFINE_INACTIVE_GUARD and activate_guard are added to cleanup.h for use in the __DO_TRACE() macro. Those appear to be more flexible than the guard_if() proposed by Peter Zijlstra in the previous round of review [5]. This series is based on kernel v6.9.6. Thanks, Mathieu Link: https://lore.kernel.org/lkml/20231120205418.334172-1-mathieu.desnoyers@xxxxxxxxxxxx/ # [1] Link: https://lore.kernel.org/lkml/e4e9a2bc-1776-4b51-aba4-a147795a5de1@xxxxxxxxxxxx/ # [2] Link: https://lore.kernel.org/lkml/a0ac5f77-411e-4562-9863-81196238f3f5@xxxxxxxxxxxx/ # [3] Link: https://lore.kernel.org/lkml/ba543d44-9302-4115-ac4f-d4e9f8d98a90@paulmck-laptop/ # [4] Link: https://lore.kernel.org/lkml/20231120221524.GD8262@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx/ # [5] Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Alexei Starovoitov <ast@xxxxxxxxxx> Cc: Yonghong Song <yhs@xxxxxx> Cc: Paul E. McKenney <paulmck@xxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx> Cc: Jiri Olsa <jolsa@xxxxxxxxxx> Cc: Namhyung Kim <namhyung@xxxxxxxxxx> Cc: bpf@xxxxxxxxxxxxxxx Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> Mathieu Desnoyers (8): cleanup.h: Header include guard should match header name cleanup.h guard: Rename DEFINE_ prefix to DECLARE_ cleanup.h: Introduce DEFINE_INACTIVE_GUARD and activate_guard 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 drivers/cxl/core/cdat.c | 2 +- drivers/cxl/cxl.h | 2 +- drivers/gpio/gpiolib.h | 2 +- drivers/platform/x86/intel/pmc/core_ssram.c | 2 +- fs/fuse/virtio_fs.c | 2 +- fs/pstore/inode.c | 4 +- include/linux/bitmap.h | 2 +- include/linux/cleanup.h | 85 ++++++++++++-------- include/linux/cpu.h | 2 +- include/linux/cpumask.h | 2 +- include/linux/device.h | 6 +- include/linux/file.h | 4 +- include/linux/firmware.h | 2 +- include/linux/gpio/driver.h | 4 +- include/linux/iio/iio.h | 4 +- include/linux/irqflags.h | 4 +- include/linux/mutex.h | 6 +- include/linux/of.h | 2 +- include/linux/pci.h | 4 +- include/linux/percpu.h | 2 +- include/linux/preempt.h | 6 +- include/linux/rcupdate.h | 2 +- include/linux/rwsem.h | 10 +-- include/linux/sched/task.h | 4 +- include/linux/slab.h | 4 +- include/linux/spinlock.h | 38 ++++----- include/linux/srcu.h | 2 +- include/linux/tracepoint-defs.h | 14 ++++ include/linux/tracepoint.h | 88 +++++++++++++++------ include/sound/pcm.h | 6 +- include/trace/bpf_probe.h | 20 ++++- 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/sched/core.c | 4 +- kernel/sched/sched.h | 16 ++-- kernel/trace/bpf_trace.c | 11 ++- kernel/trace/trace_events.c | 28 +++++-- kernel/trace/trace_fprobe.c | 5 +- kernel/trace/trace_syscalls.c | 52 ++++++++++-- kernel/tracepoint.c | 65 +++++++++------ lib/locking-selftest.c | 12 +-- sound/core/control_led.c | 2 +- 45 files changed, 441 insertions(+), 193 deletions(-) -- 2.39.2
