tracing/syscall: Avoid perf_trace_buf_*() if sys_data->perf_events is empty

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perf_trace_buf_prepare() + perf_trace_buf_submit(head, task => NULL)
make no sense if hlist_empty(head). Change perf_syscall_enter/exit()
to check sys_data->{enter,exit}_event->perf_events beforehand.

Link: http://lkml.kernel.org/r/20130617170207.GA19806@redhat.com

Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Oleg Nesterov 2013-06-17 19:02:07 +02:00 • committed by Steven Rostedt

parent b8ebfd3f71

commit 421c7860c6

1 changed files with 8 additions and 4 deletions

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kernel/trace/trace_syscalls.c

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