tracing: Do not start benchmark on boot up

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Trace events are enabled very early on boot up via the boot command line
parameter. The benchmark tool creates a new thread to perform the trace
event benchmarking. But at start up, it is called before scheduling is set
up and because it creates a new thread before the init thread is created,
this crashes the kernel.

Have the benchmark fail to register when started via the kernel command
line.

Also, since the registering of a tracepoint now can handle failure cases,
return -ENOMEM instead of warning if the thread cannot be created.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

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Steven Rostedt (Red Hat) 2016-11-28 13:17:25 -05:00 • committed by Steven Rostedt

parent 8cf868affd

commit 1dd349ab74

1 changed files with 11 additions and 1 deletions

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kernel/trace/trace_benchmark.c

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