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Commit 17a9e7bb authored by Randy Dunlap's avatar Randy Dunlap Committed by Jens Axboe
Browse files

Documentation: remove anticipatory scheduler info 



Remove anticipatory block I/O scheduler info from Documentation/
since the code has been deleted.

Signed-off-by: default avatarRandy Dunlap <randy.dunlap@oracle.com>
Reported-by: default avatar"Robert P. J. Day" <rpjday@crashcourse.ca>
Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 02e031cb

Documentation/block/switching-sched.txt

+4 −4
Original line number Original line Diff line number Diff line
@@ -16,7 +16,7 @@ you can do so by typing: 
As of the Linux 2.6.10 kernel, it is now possible to change the

As of the Linux 2.6.10 kernel, it is now possible to change the

IO scheduler for a given block device on the fly (thus making it possible,

IO scheduler for a given block device on the fly (thus making it possible,

for instance, to set the CFQ scheduler for the system default, but

for instance, to set the CFQ scheduler for the system default, but

set a specific device to use the anticipatory or noop schedulers - which

set a specific device to use the deadline or noop schedulers - which

can improve that device's throughput).

can improve that device's throughput).





To set a specific scheduler, simply do this:

To set a specific scheduler, simply do this:
@@ -31,7 +31,7 @@ a "cat /sys/block/DEV/queue/scheduler" - the list of valid names 
will be displayed, with the currently selected scheduler in brackets:

will be displayed, with the currently selected scheduler in brackets:





# cat /sys/block/hda/queue/scheduler

# cat /sys/block/hda/queue/scheduler

noop anticipatory deadline [cfq]

noop deadline [cfq]

# echo anticipatory > /sys/block/hda/queue/scheduler

# echo deadline > /sys/block/hda/queue/scheduler

# cat /sys/block/hda/queue/scheduler

# cat /sys/block/hda/queue/scheduler

noop [anticipatory] deadline cfq
 
noop [deadline] cfq

Documentation/kernel-parameters.txt

+1 −1
Original line number Original line Diff line number Diff line
@@ -706,7 +706,7 @@ and is between 256 and 4096 characters. It is defined in the file 
			arch/x86/kernel/cpu/cpufreq/elanfreq.c.

			arch/x86/kernel/cpu/cpufreq/elanfreq.c.





	elevator=	[IOSCHED]

	elevator=	[IOSCHED]

			Format: {"anticipatory" | "cfq" | "deadline" | "noop"}

			Format: {"cfq" | "deadline" | "noop"}

			See Documentation/block/as-iosched.txt and

			See Documentation/block/as-iosched.txt and

			Documentation/block/deadline-iosched.txt for details.

			Documentation/block/deadline-iosched.txt for details.

Documentation/rbtree.txt

+2 −2
Original line number Original line Diff line number Diff line
@@ -21,8 +21,8 @@ three rotations, respectively, to balance the tree), with slightly slower 
To quote Linux Weekly News:

To quote Linux Weekly News:





    There are a number of red-black trees in use in the kernel.

    There are a number of red-black trees in use in the kernel.

    The anticipatory, deadline, and CFQ I/O schedulers all employ

    The deadline and CFQ I/O schedulers employ rbtrees to

    rbtrees to track requests; the packet CD/DVD driver does the same.

    track requests; the packet CD/DVD driver does the same.

    The high-resolution timer code uses an rbtree to organize outstanding

    The high-resolution timer code uses an rbtree to organize outstanding

    timer requests.  The ext3 filesystem tracks directory entries in a

    timer requests.  The ext3 filesystem tracks directory entries in a

    red-black tree.  Virtual memory areas (VMAs) are tracked with red-black

    red-black tree.  Virtual memory areas (VMAs) are tracked with red-black