While profiling with trace-cmd, I found that the there was a global
mutex being taken in the per-cpu splice code. This was slowing down
the recording and causing more missed events than necessary.
By adding a ref count to the tracer, and preventing the tracer from
changing when the ref count is non-zero (when a trace file is opened)
we can remove the taking of the trace_types_lock mutex from the
splice page and speed things up a bit.
git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
for-next
Head SHA1: d716ff71dd12bc6328f84a9ec1c3647daf01c827
Steven Rostedt (Red Hat) (2):
tracing: Add ref count to tracer for when they are being read by pipe
tracing: Remove taking of trace_types_lock in pipe files
----
kernel/trace/trace.c | 126 ++++++++++++++++++---------------------------------
kernel/trace/trace.h | 1 +
2 files changed, 44 insertions(+), 83 deletions(-)
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