| Message ID | 20220523161601.58078-7-p.raghav@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v5,1/7] block: make blkdev_nr_zones and blk_queue_zone_no generic for npo2 zsze | expand |
On Mon, May 23, 2022 at 06:16:00PM +0200, Pankaj Raghav wrote: > Instead of doing is_power_of_2 and ilog2 operation for every IO, cache > the zone_size_sects_shift variable and use it for power of 2 zoned > devices. > > This variable will be set to zero for non power of 2 zoned devices. > > Suggested-by: Damien Le Moal <damien.lemoal@wdc.com> > Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org> Luis
On 5/23/22 18:16, Pankaj Raghav wrote: > Instead of doing is_power_of_2 and ilog2 operation for every IO, cache > the zone_size_sects_shift variable and use it for power of 2 zoned > devices. > > This variable will be set to zero for non power of 2 zoned devices. > > Suggested-by: Damien Le Moal <damien.lemoal@wdc.com> > Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> > --- > drivers/block/null_blk/null_blk.h | 6 ++++++ > drivers/block/null_blk/zoned.c | 10 ++++++++-- > 2 files changed, 14 insertions(+), 2 deletions(-) > > diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h > index 78eb56b0ca55..3d6e41a9491f 100644 > --- a/drivers/block/null_blk/null_blk.h > +++ b/drivers/block/null_blk/null_blk.h > @@ -74,6 +74,12 @@ struct nullb_device { > unsigned int imp_close_zone_no; > struct nullb_zone *zones; > sector_t zone_size_sects; > + /* > + * zone_size_sects_shift is only useful when the zone size is > + * power of 2. This variable is set to zero when zone size is non > + * power of 2. > + */ > + unsigned int zone_size_sects_shift; > bool need_zone_res_mgmt; > spinlock_t zone_res_lock; > > diff --git a/drivers/block/null_blk/zoned.c b/drivers/block/null_blk/zoned.c > index 00c34e65ef0a..806bef98ac83 100644 > --- a/drivers/block/null_blk/zoned.c > +++ b/drivers/block/null_blk/zoned.c > @@ -13,8 +13,8 @@ static inline sector_t mb_to_sects(unsigned long mb) > > static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) > { > - if (is_power_of_2(dev->zone_size_sects)) > - return sect >> ilog2(dev->zone_size_sects); > + if (dev->zone_size_sects_shift) > + return sect >> dev->zone_size_sects_shift; > > return div64_u64(sect, dev->zone_size_sects); > } > @@ -82,6 +82,12 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) > zone_capacity_sects = mb_to_sects(dev->zone_capacity); > dev_capacity_sects = mb_to_sects(dev->size); > dev->zone_size_sects = mb_to_sects(dev->zone_size); > + > + if (is_power_of_2(dev->zone_size_sects)) > + dev->zone_size_sects_shift = ilog2(dev->zone_size_sects); > + else > + dev->zone_size_sects_shift = 0; > + > dev->nr_zones = > div64_u64(roundup(dev_capacity_sects, dev->zone_size_sects), > dev->zone_size_sects); Reviewed-by: Hannes Reinecke <hare@suse.de> Cheers, Hannes
diff --git a/drivers/block/null_blk/null_blk.h b/drivers/block/null_blk/null_blk.h index 78eb56b0ca55..3d6e41a9491f 100644 --- a/drivers/block/null_blk/null_blk.h +++ b/drivers/block/null_blk/null_blk.h @@ -74,6 +74,12 @@ struct nullb_device { unsigned int imp_close_zone_no; struct nullb_zone *zones; sector_t zone_size_sects; + /* + * zone_size_sects_shift is only useful when the zone size is + * power of 2. This variable is set to zero when zone size is non + * power of 2. + */ + unsigned int zone_size_sects_shift; bool need_zone_res_mgmt; spinlock_t zone_res_lock; diff --git a/drivers/block/null_blk/zoned.c b/drivers/block/null_blk/zoned.c index 00c34e65ef0a..806bef98ac83 100644 --- a/drivers/block/null_blk/zoned.c +++ b/drivers/block/null_blk/zoned.c @@ -13,8 +13,8 @@ static inline sector_t mb_to_sects(unsigned long mb) static inline unsigned int null_zone_no(struct nullb_device *dev, sector_t sect) { - if (is_power_of_2(dev->zone_size_sects)) - return sect >> ilog2(dev->zone_size_sects); + if (dev->zone_size_sects_shift) + return sect >> dev->zone_size_sects_shift; return div64_u64(sect, dev->zone_size_sects); } @@ -82,6 +82,12 @@ int null_init_zoned_dev(struct nullb_device *dev, struct request_queue *q) zone_capacity_sects = mb_to_sects(dev->zone_capacity); dev_capacity_sects = mb_to_sects(dev->size); dev->zone_size_sects = mb_to_sects(dev->zone_size); + + if (is_power_of_2(dev->zone_size_sects)) + dev->zone_size_sects_shift = ilog2(dev->zone_size_sects); + else + dev->zone_size_sects_shift = 0; + dev->nr_zones = div64_u64(roundup(dev_capacity_sects, dev->zone_size_sects), dev->zone_size_sects);
Instead of doing is_power_of_2 and ilog2 operation for every IO, cache the zone_size_sects_shift variable and use it for power of 2 zoned devices. This variable will be set to zero for non power of 2 zoned devices. Suggested-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com> --- drivers/block/null_blk/null_blk.h | 6 ++++++ drivers/block/null_blk/zoned.c | 10 ++++++++-- 2 files changed, 14 insertions(+), 2 deletions(-)