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(parent: ff84c50) | patch
ring-buffer: Optimize rb_iter_head_event()
authorSteven Rostedt (VMware) <rostedt@goodmis.org>
Tue, 17 Mar 2020 21:32:29 +0000 (17:32 -0400)
committerSteven Rostedt (VMware) <rostedt@goodmis.org>
Thu, 19 Mar 2020 23:11:20 +0000 (19:11 -0400)
commit153368ce1bd0ccb47812a3185e824445a7024ea5
tree1733d0e1eeb0611c99aa07bd96b697a03b00d198tree | snapshot
parentff84c50cfb4b8dc68c982fb6c05a524e1539ee2fcommit | diff
ring-buffer: Optimize rb_iter_head_event()

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>
kernel/trace/ring_buffer.c diff | blob | history
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