On Mon, Sep 9, 2024 at 1:17 PM Mathieu Desnoyers <[email protected]> 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/[email protected]/ > # [1] > Cc: Peter Zijlstra <[email protected]> > Cc: Alexei Starovoitov <[email protected]> > Cc: Yonghong Song <[email protected]> > Cc: Paul E. McKenney <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: Arnaldo Carvalho de Melo <[email protected]> > Cc: Mark Rutland <[email protected]> > Cc: Alexander Shishkin <[email protected]> > Cc: Namhyung Kim <[email protected]> > Cc: Andrii Nakryiko <[email protected]> > Cc: [email protected] > Cc: Joel Fernandes <[email protected]> > Cc: [email protected] > > 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
