tree 462c57a8375b3c19d642d11dc43344a6f7aecab7
parent 6470812e22261d2342ef1597be62e63a0423d691
author Shaohua Li <shli@fb.com> 1503097693 -0700
committer Jens Axboe <axboe@kernel.dk> 1503525393 -0600

blk-throttle: cap discard request size

discard request usually is very big and easily use all bandwidth budget
of a cgroup. discard request size doesn't really mean the size of data
written, so it doesn't make sense to account it into bandwidth budget.
Jens pointed out treating the size 0 doesn't make sense too, because
discard request does have cost. But it's not easy to find the actual
cost. This patch simply makes the size one sector.

Signed-off-by: Shaohua Li <shli@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>