Divyesh Shah 3a9a3f6cc5 cfq-iosched: Allow RT requests to pre-empt ongoing BE timeslice ... This patch adds the ability to pre-empt an ongoing BE timeslice when a RT request is waiting for the current timeslice to complete. This reduces the wait time to disk for RT requests from an upper bound of 4 (current value of cfq_quantum) to 1 disk request. Applied Jens' suggeested changes to avoid the rb lookup and use !cfq_class_rt() and retested. Latency(secs) for the RT task when doing sequential reads from 10G file. | only RT | RT + BE | RT + BE + this patch small (512 byte) reads | 143 | 163 | 145 large (1Mb) reads | 142 | 158 | 146 Signed-off-by: Divyesh Shah <dpshah@google.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>		2009-01-30 12:47:33 +01:00
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as-iosched.c
blk-barrier.c	block: Fix documentation for blkdev_issue_flush()	2009-01-30 12:34:37 +01:00
blk-core.c	block: add sysfs file for controlling io stats accounting	2009-01-30 12:34:38 +01:00
blk-exec.c
blk-integrity.c	block: Allow empty integrity profile	2009-01-30 12:34:36 +01:00
blk-ioc.c
blk-map.c
blk-merge.c
blk-settings.c
blk-softirq.c
blk-sysfs.c	block: add sysfs file for controlling io stats accounting	2009-01-30 12:34:38 +01:00
blk-tag.c
blk-timeout.c
blk.h
blktrace.c	block: get rid of the manual directory counting in blktrace	2009-01-30 12:34:36 +01:00
bsg.c
cfq-iosched.c	cfq-iosched: Allow RT requests to pre-empt ongoing BE timeslice	2009-01-30 12:47:33 +01:00
cmd-filter.c
compat_ioctl.c
deadline-iosched.c
elevator.c
genhd.c
ioctl.c
Kconfig
Kconfig.iosched
Makefile
noop-iosched.c
scsi_ioctl.c