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tracing: Open tracer when ftrace_dump_on_oops is used

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With ftrace_dump_on_oops, we previously did not open the tracer in
question, sometimes causing the trace output to be useless.

For example, the function_graph tracer with tracing_thresh set dumped via
ftrace_dump_on_oops would show a series of '}' indented at different levels,
but no function names.

call trace->open() (and do a few other fixups copied from the normal dump
path) to make the output more intelligible.

Link: http://lkml.kernel.org/r/1382554197-16961-1-git-send-email-cody@linux.vnet.ibm.com

Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Cody P Schafer 2013-10-23 11:49:57 -07:00 committed by Steven Rostedt
parent d562aff93b
commit b2f974d6af
1 changed files with 11 additions and 0 deletions
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11
kernel/trace/trace.c
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@ -6276,6 +6276,17 @@ void trace_init_global_iter(struct trace_iterator *iter)
iter->trace = iter->tr->current_trace;
iter->cpu_file = RING_BUFFER_ALL_CPUS;
iter->trace_buffer = &global_trace.trace_buffer;
if (iter->trace && iter->trace->open)
iter->trace->open(iter);
/* Annotate start of buffers if we had overruns */
if (ring_buffer_overruns(iter->trace_buffer->buffer))
iter->iter_flags |= TRACE_FILE_ANNOTATE;
/* Output in nanoseconds only if we are using a clock in nanoseconds. */
if (trace_clocks[iter->tr->clock_id].in_ns)
iter->iter_flags |= TRACE_FILE_TIME_IN_NS;
}
void ftrace_dump(enum ftrace_dump_mode oops_dump_mode)