On Mon, Sep 9, 2024 at 1:17 PM Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> wrote: > > 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. > > This series was compile and runtime tested with ftrace and perf syscall > tracing and raw syscall tracing, adding a WARN_ON_ONCE() in the > generated code to validate that the intended probes are used for raw > syscall tracing. The might_fault() added within those probes validate > that they are called from a context where handling a page fault is OK. > > For ebpf, this series is compile-tested only. What tree/branch was this based on? I can't apply it cleanly anywhere I tried... > > This series replaces the "Faultable Tracepoints v6" series found at [1]. > > Thanks, > > Mathieu > > Link: https://lore.kernel.org/lkml/20240828144153.829582-1-mathieu.desnoyers@xxxxxxxxxxxx/ # [1] > 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: Namhyung Kim <namhyung@xxxxxxxxxx> > Cc: Andrii Nakryiko <andrii.nakryiko@xxxxxxxxx> > Cc: bpf@xxxxxxxxxxxxxxx > Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx> > Cc: linux-trace-kernel@xxxxxxxxxxxxxxx > > Mathieu Desnoyers (8): > tracing: Declare system call tracepoints with TRACE_EVENT_SYSCALL > tracing/ftrace: guard syscall probe with preempt_notrace > tracing/perf: guard syscall probe with preempt_notrace > tracing/bpf: guard syscall probe with preempt_notrace > tracing: Allow system call tracepoints to handle page faults > tracing/ftrace: Add might_fault check to syscall probes > tracing/perf: Add might_fault check to syscall probes > tracing/bpf: Add might_fault check to syscall probes > > include/linux/tracepoint.h | 87 +++++++++++++++++++++++++-------- > include/trace/bpf_probe.h | 13 +++++ > include/trace/define_trace.h | 5 ++ > include/trace/events/syscalls.h | 4 +- > include/trace/perf.h | 43 ++++++++++++++-- > include/trace/trace_events.h | 61 +++++++++++++++++++++-- > init/Kconfig | 1 + > kernel/entry/common.c | 4 +- > kernel/trace/trace_syscalls.c | 36 ++++++++++++-- > 9 files changed, 218 insertions(+), 36 deletions(-) > > -- > 2.39.2
