ring-buffer: Optimize rb_iter_head_event()

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As it is fine to perform several "peeks" of event data in the ring buffer
via the iterator before moving it forward, do not re-read the event, just
return what was read before. Otherwise, it can cause inconsistent results,
especially when testing multiple CPU buffers to interleave them.

Link: http://lkml.kernel.org/r/20200317213416.592032170@goodmis.org

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

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Steven Rostedt (VMware) 2020-03-17 17:32:29 -04:00

parent ff84c50cfb

commit 153368ce1b

1 changed files with 3 additions and 0 deletions

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kernel/trace/ring_buffer.c

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