On Tue, Nov 27, 2018 at 8:25 PM Damien Le Moal <[email protected]> wrote: > > Add the description of the zoned, nr_zones and chunk_sectors sysfs queue > attributes to Documentation/block/queue-sysfs.txt. The description of > the zoned and chunk_sector attributes are mostly copied from > ABI/testing/sysfs-block. While at it, also fix a typo in the description > of the io_poll_delay attribute. > > nr_zones description is also added to ABI/testing/sysfs-block and > contyact email address updated for the zoned attribute. > > Signed-off-by: Damien Le Moal <[email protected]> > --- > Documentation/ABI/testing/sysfs-block | 10 ++++++++- > Documentation/block/queue-sysfs.txt | 29 ++++++++++++++++++++++++++- > 2 files changed, 37 insertions(+), 2 deletions(-) > > diff --git a/Documentation/ABI/testing/sysfs-block > b/Documentation/ABI/testing/sysfs-block > index dea212db9df3..3789b32759dd 100644 > --- a/Documentation/ABI/testing/sysfs-block > +++ b/Documentation/ABI/testing/sysfs-block > @@ -244,7 +244,7 @@ Description: > > What: /sys/block/<disk>/queue/zoned > Date: September 2016 > -Contact: Damien Le Moal <[email protected]> > +Contact: Damien Le Moal <[email protected]> > Description: > zoned indicates if the device is a zoned block device > and the zone model of the device if it is indeed zoned. > @@ -259,6 +259,14 @@ Description: > zone commands, they will be treated as regular block > devices and zoned will report "none". > > +What: /sys/block/<disk>/queue/nr_zones > +Date: November 2018 > +Contact: Damien Le Moal <[email protected]> > +Description: > + nr_zones indicates the total number of zones of a zoned block > + device ("host-aware" or "host-managed" zone model). For > regular > + block devices, the value is always 0. > + > What: /sys/block/<disk>/queue/chunk_sectors > Date: September 2016 > Contact: Hannes Reinecke <[email protected]> > diff --git a/Documentation/block/queue-sysfs.txt > b/Documentation/block/queue-sysfs.txt > index 2c1e67058fd3..a23952567008 100644 > --- a/Documentation/block/queue-sysfs.txt > +++ b/Documentation/block/queue-sysfs.txt > @@ -64,7 +64,7 @@ guess, the kernel will put the process issuing IO to sleep > for an amount > of time, before entering a classic poll loop. This mode might be a > little slower than pure classic polling, but it will be more efficient. > If set to a value larger than 0, the kernel will put the process issuing > -IO to sleep for this amont of microseconds before entering classic > +IO to sleep for this amount of microseconds before entering classic > polling. > > iostats (RW) > @@ -194,4 +194,31 @@ blk-throttle makes decision based on the samplings. > Lower time means cgroups > have more smooth throughput, but higher CPU overhead. This exists only when > CONFIG_BLK_DEV_THROTTLING_LOW is enabled. > > +zoned (RO) > +---------- > +This indicates if the device is a zoned block device and the zone model of > the > +device if it is indeed zoned. The possible values indicated by zoned are > +"none" for regular block devices and "host-aware" or "host-managed" for zoned > +block devices. The characteristics of host-aware and host-managed zoned block > +devices are described in the ZBC (Zoned Block Commands) and ZAC > +(Zoned Device ATA Command Set) standards. These standards also define the > +"drive-managed" zone model. However, since drive-managed zoned block devices > +do not support zone commands, they will be treated as regular block devices > +and zoned will report "none". > + > +nr_zones (RO) > +------------- > +For zoned block devices (zoned attribute indicating "host-managed" or > +"host-aware"), this indicates the total number of zones of the device. > +This is always 0 for regular block devices. > + > +chunk_sectors (RO) > +------------------ > +This has different meaning depending on the type of the block device. > +For a RAID device (dm-raid), chunk_sectors indicates the size in 512B sectors > +of the RAID volume stripe segment. For a zoned block device, either > host-aware > +or host-managed, chunk_sectors indicates the size of 512B sectors of the > zones > +of the device, with the eventual exception of the last zone of the device > which > +may be smaller. > +
For the part that says, "...chunk_sectors indicates the size of 512B sectors of the zones of the device", should it be this instead? "...chunk_sectors indicates the size in 512B sectors of the zones of the device" Thanks, Bryan > Jens Axboe <[email protected]>, February 2009 > -- > 2.19.1 >
