Le Thu, Oct 03, 2024 at 06:25:08PM -0400, Steven Rostedt a écrit : > On Thu, 3 Oct 2024 11:16:33 -0400 > Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx> wrote: > > > In preparation for allowing system call enter/exit instrumentation to > > handle page faults, make sure that perf can handle this change by > > explicitly disabling preemption within the perf system call tracepoint > > probes to respect the current expectations within perf ring buffer code. > > > > This change does not yet allow perf to take page faults per se within > > its probe, but allows its existing probes to adapt to the upcoming > > change. > > Frederic, > > Does the perf ring buffer expect preemption to be disabled when used? > > In other words, is this patch needed? At least the trace events perf callback requires that because it uses a per cpu buffer (see perf_trace_buf_alloc()). Thanks.
