On Thu, Oct 3, 2024 at 3:25 PM Steven Rostedt <rostedt@xxxxxxxxxxx> wrote:
On Thu, 3 Oct 2024 11:16:34 -0400
Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> wrote:
In preparation for allowing system call enter/exit instrumentation to
handle page faults, make sure that bpf can handle this change by
explicitly disabling preemption within the bpf system call tracepoint
probes to respect the current expectations within bpf tracing code.
This change does not yet allow bpf to take page faults per se within its
probe, but allows its existing probes to adapt to the upcoming change.
I guess the BPF folks should state if this is needed or not?
Does the BPF hooks into the tracepoints expect preemption to be disabled
when called?
Andrii pointed it out already.
bpf doesn't need preemption to be disabled.
Only migration needs to be disabled.