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Hou Tao ddf63516d8 blk-ioprio: Introduce promote-to-rt policy 
Since commit a78418e6a0 ("block: Always initialize bio IO priority on
submit"), bio->bi_ioprio will never be IOPRIO_CLASS_NONE when calling
blkcg_set_ioprio(), so there will be no way to promote the io-priority
of one cgroup to IOPRIO_CLASS_RT, because bi_ioprio will always be
greater than or equals to IOPRIO_CLASS_RT.

It seems possible to call blkcg_set_ioprio() first then try to
initialize bi_ioprio later in bio_set_ioprio(), but this doesn't work
for bio in which bi_ioprio is already initialized (e.g., direct-io), so
introduce a new promote-to-rt policy to promote the iopriority of bio to
IOPRIO_CLASS_RT if the ioprio is not already RT.

For none-to-rt policy, although it doesn't work now, but considering
that its purpose was also to override the io-priority to RT and allowing
for a smoother transition, just keep it and treat it as an alias of
the promote-to-rt policy.

Acked-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Hou Tao <houtao1@huawei.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Link: https://lore.kernel.org/r/20230428074404.280532-1-houtao@huaweicloud.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2023-06-06 22:26:26 -06:00
..
ABI dmaengine updates for v6.4 2023-05-03 11:11:56 -07:00
accel accel/qaic: Add documentation for AIC100 accelerator driver 2023-04-06 08:23:03 +02:00
accounting Scheduler changes for v6.4: 2023-04-28 14:53:30 -07:00
admin-guide blk-ioprio: Introduce promote-to-rt policy 2023-06-06 22:26:26 -06:00
arch A handful of late-arriving documentation fixes, plus one Spanish 2023-05-05 13:16:42 -07:00
arm ARM: SoC devicetree changes for 6.4 2023-04-25 12:11:54 -07:00
arm64 irqchip/gic-v3: Add Rockchip 3588001 erratum workaround 2023-04-18 17:31:17 +01:00
block Documentation/block: drop the request.rst file 2023-05-12 11:04:58 -06:00
bpf lsm/stable-6.4 PR 20230428 2023-04-29 10:17:05 -07:00
cdrom
core-api mm: Don't pin ZERO_PAGE in pin_user_pages() 2023-05-31 09:48:15 -06:00
cpu-freq Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
crypto Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
dev-tools Mainly singleton patches all over the place. Series of note are: 2023-04-27 19:57:00 -07:00
devicetree dt-bindings: PCI: fsl,imx6q: fix assigned-clocks warning 2023-05-09 08:01:49 +02:00
doc-guide
driver-api pwm: Changes for v6.4-rc1 2023-05-03 11:25:01 -07:00
fault-injection block: null_blk: make fault-injection dynamically configurable per device 2023-04-13 07:38:55 -06:00
fb
features s390: enable ARCH_HAS_MEMBARRIER_SYNC_CORE 2023-03-27 17:19:52 +02:00
filesystems 9p patches for 6.4 merge window 2023-05-04 14:37:53 -07:00
firmware-guide ACPI: docs: enumeration: Correct reference to the I²C device data type 2023-03-07 14:09:49 +01:00
firmware_class
fpga Documentation: fpga: dfl: Add documentation for DFHv1 2023-01-19 16:07:40 +01:00
gpu Merge tag 'amd-drm-next-6.4-2023-03-17' of https://gitlab.freedesktop.org/agd5f/linux into drm-next 2023-03-20 16:44:36 +10:00
hid It has been a moderately calm cycle for documentation; the significant 2023-02-22 12:00:20 -08:00
hwmon hwmon: (aquacomputer_d5next) Add support for Aquacomputer Aquastream XT 2023-04-21 07:27:23 -07:00
i2c Documentation: i2c: correct spelling 2023-02-15 20:59:44 +01:00
iio
images
infiniband
input Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
isdn Documentation: isdn: correct spelling 2023-02-10 16:28:13 -08:00
kbuild parisc: update kbuild doc. aliases for parisc64 2023-05-03 17:43:10 +02:00
kernel-hacking Documentation: Add document for false sharing 2023-04-10 16:46:11 -06:00
leds - New Drivers 2023-05-02 10:36:02 -07:00
litmus-tests LKMM scripting updates for v6.4 2023-04-24 12:02:25 -07:00
livepatch Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
locking docs: locking: refer to the actual existing config names 2023-02-23 12:26:00 -07:00
loongarch
maintainer docs: rebasing-and-merging: Drop wrong statement about git 2023-03-07 10:26:22 -07:00
mhi
mips
misc-devices
mm - Nick Piggin's "shoot lazy tlbs" series, to improve the peformance of 2023-04-27 19:42:02 -07:00
netlabel
netlink net/handshake: Add a kernel API for requesting a TLSv1.3 handshake 2023-04-19 18:48:48 -07:00
networking docs: networking: fix x25-iface.rst heading & index order 2023-05-10 10:31:46 +01:00
nvdimm
nvme
PCI ixgb: Remove ixgb driver 2023-03-19 10:51:07 +00:00
pcmcia
peci Docs/subsystem-apis: Remove '[The ]Linux' prefixes from titles of listed documents 2023-01-24 15:27:08 -07:00
power regulator: consumer.rst: fix 'regulator_enable' typo. 2023-04-27 21:55:38 +01:00
powerpc
process Mainly singleton patches all over the place. Series of note are: 2023-04-27 19:57:00 -07:00
RCU doc: Update whatisRCU.rst 2023-04-05 13:47:18 +00:00
riscv RISC-V Patches for the 6.4 Merge Window, Part 1 2023-04-28 16:55:39 -07:00
rust rust: sort uml documentation arch support table 2023-04-06 23:11:04 +02:00
s390 VFIO updates for v6.3-rc1 2023-02-25 11:52:57 -08:00
scheduler sh updates for v6.4 2023-04-27 17:41:23 -07:00
scsi scsi: core: Declare SCSI host template pointer members const 2023-03-24 19:19:19 -04:00
security lsm: move hook comments docs to security/security.c 2023-04-28 11:58:34 -04:00
sound ALSA: docs: Fix code block indentation in ALSA driver example 2023-05-03 08:08:25 +02:00
sphinx docs: Use HTML comments for the kernel-toc SPDX line 2023-02-16 16:06:44 -07:00
sphinx-static docs: Add more information to the HTML sidebar 2023-02-08 13:28:27 -07:00
spi spi: docs: adjust summary to CONFIG_SYSFS_DEPRECATED removal 2023-03-14 13:30:52 +00:00
staging tee: optee: Add SMC for loading OP-TEE image 2023-04-03 08:57:49 +02:00
target scsi: target: Documentation: Correct spelling 2023-02-08 18:49:48 -05:00
timers Documentation: timers: hrtimers: Make hybrid union historical 2023-05-02 10:49:58 -06:00
tools rtla/timerlat: Add auto-analysis only option 2023-04-25 19:26:17 -04:00
trace Minor tracing updates: 2023-05-05 13:11:02 -07:00
translations A handful of late-arriving documentation fixes, plus one Spanish 2023-05-05 13:16:42 -07:00
usb usb: gadget: uvc: Make bmControls attr read/write 2023-03-29 08:51:26 +02:00
userspace-api Char/Misc drivers for 6.4-rc1 2023-04-27 12:07:50 -07:00
virt VFIO updates for v6.4-rc1 2023-05-02 11:56:43 -07:00
w1
watchdog Documentation/watchdog/hpwdt: Fix Format 2023-02-16 17:31:29 -07:00
.gitignore
atomic_bitops.txt
atomic_t.txt
Changes
CodingStyle
conf.py docs: turn off "smart quotes" in the HTML build 2023-04-20 17:53:18 -06:00
docutils.conf
dontdiff scripts: remove bin2c 2023-01-26 12:43:33 +09:00
index.rst docs: create a top-level arch/ directory 2023-03-23 13:27:27 -06:00
Kconfig Documentation: Avoid duplicate Kconfig inclusion 2023-01-19 13:56:34 -07:00
Makefile kbuild: do not print extra logs for V=2 2023-01-22 23:43:32 +09:00
memory-barriers.txt
SubmittingPatches
subsystem-apis.rst