Commit-ID: 621968cdb2563b667d6ecb484ba91ef4c3a797b3 Gitweb: http://git.kernel.org/tip/621968cdb2563b667d6ecb484ba91ef4c3a797b3 Author: Steven Rostedt <srostedt@xxxxxxxxxx> AuthorDate: Fri, 4 Sep 2009 12:02:35 -0400 Committer: Steven Rostedt <rostedt@xxxxxxxxxxx> CommitDate: Fri, 4 Sep 2009 12:02:35 -0400 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@xxxxxxxxxxx> --- kernel/trace/trace.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index e521f1e..9110329 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -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) -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html