Vivek Goyal fe0714377e blkio: Recalculate the throttled bio dispatch time upon throttle limit change ... o Currently any cgroup throttle limit changes are processed asynchronousy and the change does not take affect till a new bio is dispatched from same group. o It might happen that a user sets a redicuously low limit on throttling. Say 1 bytes per second on reads. In such cases simple operations like mount a disk can wait for a very long time. o Once bio is throttled, there is no easy way to come out of that wait even if user increases the read limit later. o This patch fixes it. Now if a user changes the cgroup limits, we recalculate the bio dispatch time according to new limits. o Can't take queueu lock under blkcg_lock, hence after the change I wake up the dispatch thread again which recalculates the time. So there are some variables being synchronized across two threads without lock and I had to make use of barriers. Hoping I have used barriers correctly. Any review of memory barrier code especially will help. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>		2010-10-01 14:49:49 +02:00
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blk-barrier.c
blk-cgroup.c	blkio: Recalculate the throttled bio dispatch time upon throttle limit change	2010-10-01 14:49:49 +02:00
blk-cgroup.h	blkio: Recalculate the throttled bio dispatch time upon throttle limit change	2010-10-01 14:49:49 +02:00
blk-core.c	blkio: Core implementation of throttle policy	2010-09-16 08:42:52 +02:00
blk-exec.c	block: Prevent hang_check firing during long I/O	2010-09-24 15:52:09 +02:00
blk-integrity.c
blk-ioc.c
blk-iopoll.c
blk-lib.c
blk-map.c
blk-merge.c
blk-settings.c	block: set the bounce_pfn to the actual DMA limit rather than to max memory	2010-10-01 14:45:27 +02:00
blk-softirq.c
blk-sysfs.c
blk-tag.c
blk-throttle.c	blkio: Recalculate the throttled bio dispatch time upon throttle limit change	2010-10-01 14:49:49 +02:00
blk-timeout.c
blk.h
bsg.c
cfq-iosched.c	blkio: Recalculate the throttled bio dispatch time upon throttle limit change	2010-10-01 14:49:49 +02:00
cfq.h	blk-cgroup: Prepare the base for supporting more than one IO control policies	2010-09-16 08:42:04 +02:00
compat_ioctl.c
deadline-iosched.c
elevator.c
genhd.c	block: Fix race during disk initialization	2010-09-16 20:36:36 +02:00
ioctl.c	block, partition: add partition_meta_info to hd_struct	2010-09-15 16:13:18 +02:00
Kconfig	blkio: Core implementation of throttle policy	2010-09-16 08:42:52 +02:00
Kconfig.iosched
Makefile	blkio: Core implementation of throttle policy	2010-09-16 08:42:52 +02:00
noop-iosched.c
scsi_ioctl.c