tracing: Remove taking of trace_types_lock in pipe files

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Taking the global mutex "trace_types_lock" in the trace_pipe files
causes a bottle neck as most the pipe files can be read per cpu
and there's no reason to serialize them.

The current_trace variable was given a ref count and it can not
change when the ref count is not zero. Opening the trace_pipe
files will up the ref count (and decremented on close), so that
the lock no longer needs to be taken when accessing the
current_trace variable.

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

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Steven Rostedt (Red Hat) 2014-12-15 22:31:07 -05:00 • committed by Steven Rostedt

parent cf6ab6d914

commit d716ff71dd

1 changed files with 28 additions and 82 deletions

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kernel/trace/trace.c

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