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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-12-15 20:13:31 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-12-22 15:39:40 -0500 |
| commit | cf6ab6d9143b157786bf29bca5c32e55234bb07d (patch) | |
| tree | a0c044f2bc377065ba823d08fbb33cb212c0148b /kernel/trace/trace.h | |
| parent | 97bf6af1f928216fd6c5a66e8a57bfa95a659672 (diff) | |
| download | talos-obmc-linux-cf6ab6d9143b157786bf29bca5c32e55234bb07d.tar.gz talos-obmc-linux-cf6ab6d9143b157786bf29bca5c32e55234bb07d.zip | |
tracing: Add ref count to tracer for when they are being read by pipe
When one of the trace pipe files are being read (by either the trace_pipe
or trace_pipe_raw), do not allow the current_trace to change. By adding
a ref count that is incremented when the pipe files are opened, will
prevent the current_trace from being changed.
This will allow for the removal of the global trace_types_lock from
reading the pipe buffers (which is currently a bottle neck).
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.h')
| -rw-r--r-- | kernel/trace/trace.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 8de48bac1ce2..0eddfeb05fee 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -388,6 +388,7 @@ struct tracer { struct tracer *next; struct tracer_flags *flags; int enabled; + int ref; bool print_max; bool allow_instances; #ifdef CONFIG_TRACER_MAX_TRACE |
