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| H A D | dm-mpath.c | diff ca5beb76c32af33e5be4e01c85c8bd5a067c4543 Thu Apr 27 12:11:24 CDT 2017 Bart Van Assche <bart.vanassche@sandisk.com> dm mpath: micro-optimize the hot path relative to MPATHF_QUEUE_IF_NO_PATH
Instead of checking MPATHF_QUEUE_IF_NO_PATH,
MPATHF_SAVED_QUEUE_IF_NO_PATH and the no_flush flag to decide whether
or not to push back a request (or bio) if there are no paths available,
only clear MPATHF_QUEUE_IF_NO_PATH in queue_if_no_path() if no_flush has
not been set. The result is that only a single bit has to be tested in
the hot path to decide whether or not a request must be pushed back and
also that m->lock does not have to be taken in the hot path.
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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