mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-04 09:59:32 +00:00
block: improve ioprio class description comment
In include/usapi/linux/ioprio.h, change the ioprio class enum comment to remove the outdated reference to CFQ and mention BFQ and mq-deadline instead. Also document the high priority NCQ command use for RT class IOs directed at ATA drives that support NCQ priority. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Link: https://lore.kernel.org/r/20210811033702.368488-3-damien.lemoal@wdc.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
a680dd72ec
commit
25bca50e52
1 changed files with 6 additions and 4 deletions
|
@ -13,10 +13,12 @@
|
|||
#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
|
||||
|
||||
/*
|
||||
* These are the io priority groups as implemented by CFQ. RT is the realtime
|
||||
* class, it always gets premium service. BE is the best-effort scheduling
|
||||
* class, the default for any process. IDLE is the idle scheduling class, it
|
||||
* is only served when no one else is using the disk.
|
||||
* These are the io priority groups as implemented by the BFQ and mq-deadline
|
||||
* schedulers. RT is the realtime class, it always gets premium service. For
|
||||
* ATA disks supporting NCQ IO priority, RT class IOs will be processed using
|
||||
* high priority NCQ commands. BE is the best-effort scheduling class, the
|
||||
* default for any process. IDLE is the idle scheduling class, it is only
|
||||
* served when no one else is using the disk.
|
||||
*/
|
||||
enum {
|
||||
IOPRIO_CLASS_NONE,
|
||||
|
|
Loading…
Reference in a new issue