ring-buffer: Do not die if rb_iter_peek() fails more than thrice

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As the iterator will be reading a live buffer, and if the event being read
is on a page that a writer crosses, it will fail and try again, the
condition in rb_iter_peek() that only allows a retry to happen three times
is no longer valid. Allow rb_iter_peek() to retry more than three times
without killing the ring buffer, but only if rb_iter_head_event() had failed
at least once.

Link: http://lkml.kernel.org/r/20200317213416.452888193@goodmis.org

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

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Steven Rostedt (VMware) 2020-03-17 17:32:28 -04:00

parent 785888c544

commit ff84c50cfb

1 changed files with 10 additions and 3 deletions

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kernel/trace/ring_buffer.c

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