add new system file

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2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/block/Kconfig.iosched
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 menu "IO Schedulers"
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-config IOSCHED_NOOP
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-	bool
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-	default y
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-	---help---
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-	  The no-op I/O scheduler is a minimal scheduler that does basic merging
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-	  and sorting. Its main uses include non-disk based block devices like
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-	  memory devices, and specialised software or hardware environments
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-	  that do their own scheduling and require only minimal assistance from
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-	  the kernel.
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-
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-config IOSCHED_DEADLINE
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-	tristate "Deadline I/O scheduler"
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-	default y
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-	---help---
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-	  The deadline I/O scheduler is simple and compact. It will provide
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-	  CSCAN service with FIFO expiration of requests, switching to
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-	  a new point in the service tree and doing a batch of IO from there
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-	  in case of expiry.
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-
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-config IOSCHED_CFQ
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-	tristate "CFQ I/O scheduler"
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-	default y
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-	---help---
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-	  The CFQ I/O scheduler tries to distribute bandwidth equally
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-	  among all processes in the system. It should provide a fair
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-	  and low latency working environment, suitable for both desktop
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-	  and server systems.
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-
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-	  This is the default I/O scheduler.
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-
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-config CFQ_GROUP_IOSCHED
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-	bool "CFQ Group Scheduling support"
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-	depends on IOSCHED_CFQ && BLK_CGROUP
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-	default n
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-	---help---
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-	  Enable group IO scheduling in CFQ.
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-
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-choice
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-
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-	prompt "Default I/O scheduler"
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-	default DEFAULT_CFQ
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-	help
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-	  Select the I/O scheduler which will be used by default for all
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-	  block devices.
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-
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-	config DEFAULT_DEADLINE
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-		bool "Deadline" if IOSCHED_DEADLINE=y
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-
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-	config DEFAULT_CFQ
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-		bool "CFQ" if IOSCHED_CFQ=y
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-
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-	config DEFAULT_NOOP
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-		bool "No-op"
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-
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-endchoice
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-
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-config DEFAULT_IOSCHED
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-	string
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-	default "deadline" if DEFAULT_DEADLINE
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-	default "cfq" if DEFAULT_CFQ
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-	default "noop" if DEFAULT_NOOP
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-
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 config MQ_IOSCHED_DEADLINE
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 	tristate "MQ deadline I/O scheduler"
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 	default y
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-	---help---
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+	help
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 	  MQ version of the deadline IO scheduler.
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+
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+config MQ_IOSCHED_DEADLINE_CGROUP
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+       tristate
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+       default y
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+       depends on MQ_IOSCHED_DEADLINE
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+       depends on BLK_CGROUP
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 config MQ_IOSCHED_KYBER
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 	tristate "Kyber I/O scheduler"
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 	default y
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-	---help---
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+	help
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 	  The Kyber I/O scheduler is a low-overhead scheduler suitable for
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 	  multiqueue and other fast devices. Given target latencies for reads and
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 	  synchronous writes, it will self-tune queue depths to achieve that
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@@ -82,24 +26,30 @@
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 config IOSCHED_BFQ
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 	tristate "BFQ I/O scheduler"
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-	default n
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-	---help---
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+	help
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 	BFQ I/O scheduler for BLK-MQ. BFQ distributes the bandwidth of
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 	of the device among all processes according to their weights,
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 	regardless of the device parameters and with any workload. It
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 	also guarantees a low latency to interactive and soft
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 	real-time applications.  Details in
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-	Documentation/block/bfq-iosched.txt
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+	Documentation/block/bfq-iosched.rst
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 config BFQ_GROUP_IOSCHED
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        bool "BFQ hierarchical scheduling support"
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        depends on IOSCHED_BFQ && BLK_CGROUP
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-       default n
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-       ---help---
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+       select BLK_CGROUP_RWSTAT
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+	help
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        Enable hierarchical scheduling in BFQ, using the blkio
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        (cgroups-v1) or io (cgroups-v2) controller.
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+config BFQ_CGROUP_DEBUG
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+	bool "BFQ IO controller debugging"
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+	depends on BFQ_GROUP_IOSCHED
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+	help
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+	Enable some debugging help. Currently it exports additional stat
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+	files in a cgroup which can be useful for debugging.
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+
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 endmenu
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 endif