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tracing: disable buffers and synchronize_sched before resetting 

Resetting the ring buffers while traces are happening can corrupt
the ring buffer and disable it (no kernel crash to worry about).

The safest thing to do is disable the ring buffers, call synchronize_sched()
to wait for all current writers to finish and then reset the buffer.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt 2009-09-04 12:02:35 -04:00 committed by Steven Rostedt
parent b8de7bd168
commit 621968cdb2
1 changed files with 8 additions and 0 deletions
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8
kernel/trace/trace.c
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@ -658,12 +658,20 @@ void tracing_reset(struct trace_array *tr, int cpu)
void tracing_reset_online_cpus(struct trace_array *tr)
{
struct ring_buffer *buffer = tr->buffer;
int cpu;
ring_buffer_record_disable(buffer);
/* Make sure all commits have finished */
synchronize_sched();
tr->time_start = ftrace_now(tr->cpu);
for_each_online_cpu(cpu)
tracing_reset(tr, cpu);
ring_buffer_record_enable(buffer);
}
void tracing_reset_current(int cpu)