ring-buffer: Have rb_iter_head_event() handle concurrent writer

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Have the ring_buffer_iter structure have a place to store an event, such
that it can not be overwritten by a writer, and load it in such a way via
rb_iter_head_event() that it will return NULL and reset the iter to the
start of the current page if a writer updated the page.

Link: http://lkml.kernel.org/r/20200317213416.306959216@goodmis.org

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

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Steven Rostedt (VMware) 2020-03-17 17:32:27 -04:00

parent 28e3fc56a4

commit 785888c544

1 changed files with 75 additions and 31 deletions

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108

kernel/trace/ring_buffer.c

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