On 09/30/2016 05:59 PM, Bart Van Assche wrote:
> At least with dm-mq this patch reduces the number of multipath_busy()
> calls while scsi_dh_activate() is in progress from a few million to
> a few thousand.
>
> Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
> Cc: Hannes Reinecke <hare@xxxxxxx>
> Cc: Jun'ichi Nomura <j-nomura@xxxxxxxxxxxxx>
> Cc: <stable@xxxxxxxxxxxxxxx>
> ---
> drivers/md/dm-mpath.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
> index dd80af2..dd66653 100644
> --- a/drivers/md/dm-mpath.c
> +++ b/drivers/md/dm-mpath.c
> @@ -343,12 +343,15 @@ static void multipath_init_per_bio_data(struct bio *bio, struct dm_mpath_io **mp
> * Path selection
> *-----------------------------------------------*/
>
> +/* Returns a value > 0 if path group initialization is still in progress. */
> static int __pg_init_all_paths(struct multipath *m)
> {
> struct pgpath *pgpath;
> unsigned long pg_init_delay = 0;
>
> - if (atomic_read(&m->pg_init_in_progress) || test_bit(MPATHF_PG_INIT_DISABLED, &m->flags))
> + if (atomic_read(&m->pg_init_in_progress))
> + return 1;
> + if (test_bit(MPATHF_PG_INIT_DISABLED, &m->flags))
> return 0;
>
> atomic_inc(&m->pg_init_count);
>
Good point.
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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