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| author |   Damien Le Moal <damien.lemoal@wdc.com> | 2021-08-11 12:37:01 +0900 |
|---|---|---|
| committer |   Jens Axboe <axboe@kernel.dk> | 2021-08-18 07:21:12 -0600 |
| commit | 202bc942c5cd4340d37b06c4e0b8b03f9925d818 (patch) | |
| tree | d035b4446726fef7015c835a569f83bf68d8beb3 /include/uapi/linux/ioprio.h | |
| parent | block: fix IOPRIO_PRIO_CLASS() and IOPRIO_PRIO_VALUE() macros (diff) | |
| download | linux-dev-202bc942c5cd4340d37b06c4e0b8b03f9925d818.tar.xz linux-dev-202bc942c5cd4340d37b06c4e0b8b03f9925d818.zip | |
block: Introduce IOPRIO_NR_LEVELS
The BFQ scheduler and ioprio_check_cap() both assume that the RT
priority class (IOPRIO_CLASS_RT) can have up to 8 different priority
levels, similarly to the BE class (IOPRIO_CLASS_iBE). This is
controlled using the IOPRIO_BE_NR macro , which is badly named as the
number of levels also applies to the RT class.
Introduce the class independent IOPRIO_NR_LEVELS macro, defined to 8,
to make things clear. Keep the old IOPRIO_BE_NR macro definition as an
alias for IOPRIO_NR_LEVELS.
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Link: https://lore.kernel.org/r/20210811033702.368488-6-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'include/uapi/linux/ioprio.h')
| -rw-r--r-- | include/uapi/linux/ioprio.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/uapi/linux/ioprio.h b/include/uapi/linux/ioprio.h index 936f0d8f30e1..aac39338d02c 100644 --- a/include/uapi/linux/ioprio.h +++ b/include/uapi/linux/ioprio.h @@ -32,9 +32,10 @@ enum { }; /* - * 8 best effort priority levels are supported + * The RT and BE priority classes both support up to 8 priority levels. */ -#define IOPRIO_BE_NR (8) +#define IOPRIO_NR_LEVELS 8 +#define IOPRIO_BE_NR IOPRIO_NR_LEVELS enum { IOPRIO_WHO_PROCESS = 1, |