On Fri, 2020-05-29 at 17:48 +0200, Hannes Reinecke wrote:
> On 5/28/20 6:08 AM, Damien Le Moal wrote:
> > On Wed, 2020-05-27 at 08:22 +0200, Hannes Reinecke wrote:
> > > When allocating a zone we should pass in an indicator on which
> > > device the zone should be allocated; this increases performance
> > > for a multi-device setup as then reclaim can allocate zones on
> > > the device for which reclaim is running.
> > >
> > > Signed-off-by: Hannes Reinecke <h...@suse.de>
> > > ---
> > > drivers/md/dm-zoned-metadata.c | 17 +++++++++++------
> > > drivers/md/dm-zoned-reclaim.c | 3 ++-
> > > drivers/md/dm-zoned.h | 3 ++-
> > > 3 files changed, 15 insertions(+), 8 deletions(-)
> > >
> > > diff --git a/drivers/md/dm-zoned-metadata.c
> > > b/drivers/md/dm-zoned-metadata.c
> > > index 689c1dd7ab20..0d65af94309a 100644
> > > --- a/drivers/md/dm-zoned-metadata.c
> > > +++ b/drivers/md/dm-zoned-metadata.c
> > > @@ -2045,7 +2045,7 @@ struct dm_zone *dmz_get_chunk_mapping(struct
> > > dmz_metadata *zmd, unsigned int chu
> > > goto out;
> > >
> > > /* Allocate a random zone */
> > > - dzone = dmz_alloc_zone(zmd, alloc_flags);
> > > + dzone = dmz_alloc_zone(zmd, 0, alloc_flags);
> > > if (!dzone) {
> > > if (dmz_dev_is_dying(zmd)) {
> > > dzone = ERR_PTR(-EIO);
> > > @@ -2151,7 +2151,7 @@ struct dm_zone *dmz_get_chunk_buffer(struct
> > > dmz_metadata *zmd,
> > > goto out;
> > >
> > > /* Allocate a random zone */
> > > - bzone = dmz_alloc_zone(zmd, alloc_flags);
> > > + bzone = dmz_alloc_zone(zmd, 0, alloc_flags);
> > > if (!bzone) {
> > > if (dmz_dev_is_dying(zmd)) {
> > > bzone = ERR_PTR(-EIO);
> > > @@ -2182,11 +2182,12 @@ struct dm_zone *dmz_get_chunk_buffer(struct
> > > dmz_metadata *zmd,
> > > * Get an unmapped (free) zone.
> > > * This must be called with the mapping lock held.
> > > */
> > > -struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned long
> > > flags)
> > > +struct dm_zone *dmz_alloc_zone(struct dmz_metadata *zmd, unsigned int
> > > dev_idx,
> > > + unsigned long flags)
> > > {
> > > struct list_head *list;
> > > struct dm_zone *zone;
> > > - unsigned int dev_idx = 0;
> > > + int i = 0;
> > >
> > > again:
> > > if (flags & DMZ_ALLOC_CACHE)
> > > @@ -2202,8 +2203,12 @@ struct dm_zone *dmz_alloc_zone(struct dmz_metadata
> > > *zmd, unsigned long flags)
> > > */
> > > if (!(flags & DMZ_ALLOC_RECLAIM))
> > > return NULL;
> > > - if (dev_idx < zmd->nr_devs) {
> > > - dev_idx++;
> > > + /*
> > > + * Try to allocate from other devices
> > > + */
> > > + if (i < zmd->nr_devs) {
> > > + dev_idx = (dev_idx + 1) % zmd->nr_devs;
> >
> > Hu ? You deleted dev_idx declaration above...
> >
> It's now the function argument ...
Oops... Yes, missed that...
>
> Cheers,
>
> Hannes
--
Damien Le Moal
Western Digital Research
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