aleph/lkl_linux
1
0
Fork 0
mirror of https://github.com/lkl/linux.git synced 2025-12-19 16:13:19 +09:00
Code Issues Packages Projects Releases Wiki Activity

block: fix default IO priority handling

Browse Source 
The default IO priority is the best effort (BE) class with the
normal priority level IOPRIO_NORM (4). However, get_task_ioprio()
returns IOPRIO_CLASS_NONE/IOPRIO_NORM as the default priority and
get_current_ioprio() returns IOPRIO_CLASS_NONE/0. Let's be consistent
with the defined default and have both of these functions return the
default priority IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_NORM) when
the user did not define another default IO priority for the task.

In include/uapi/linux/ioprio.h, introduce the IOPRIO_BE_NORM macro as
an alias to IOPRIO_NORM to clarify that this default level applies to
the BE priotity class. In include/linux/ioprio.h, define the macro
IOPRIO_DEFAULT as IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_BE_NORM)
and use this new macro when setting a priority to the default.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Link: https://lore.kernel.org/r/20210811033702.368488-7-damien.lemoal@wdc.com
[axboe: drop unnecessary lightnvm change]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal
2021-08-11 12:37:02 +09:00
committed by Jens Axboe
parent 202bc942c5
commit e70344c059
4 changed files with 13 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/uapi/linux/ioprio.h
View File

@@ -44,8 +44,9 @@ enum {
};
/*
* Fallback BE priority
* Fallback BE priority level.
*/
#define IOPRIO_NORM (4)
#define IOPRIO_NORM 4
#define IOPRIO_BE_NORM IOPRIO_NORM
#endif /* _UAPI_LINUX_IOPRIO_H */