Update device_add_disk() to take an 'groups' argument so that
individual drivers can register a device with additional sysfs
attributes.
This avoids race condition the driver would otherwise have if these
groups were to be created with sysfs_add_groups().
Signed-off-by: Martin Wilck <martin.wilck@suse.com>
Signed-off-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Kernel now supports cgroup bps and iops hard limit by io-throttling.
But that's not a scalable way, because block devices' bandwith is
always changing over time.
This patch dynamically adjusts bps limit of each blkio cgroup according
to its pre-set weight. Additionally, if a process has not issued any io
request during a time window, its weight will be shared by other processes
until its next io request.
Signed-off-by: Lei Chen <lennychen@tencent.com>
In order to facilitate each container to obtain its own IO statistics,
we implement per blkcg diskstats and expose some data from the host
into the container such as io_ticks.
Signed-off-by: Chunguang Xu <brookxu@tencent.com>
Kaixu Xia