• Shaohua Li's avatar
    blk-throttle: make throtl_slice tunable · 297e3d85
    Shaohua Li authored
    throtl_slice is important for blk-throttling. It's called slice
    internally but it really is a time window blk-throttling samples data.
    blk-throttling will make decision based on the samplings. An example is
    bandwidth measurement. A cgroup's bandwidth is measured in the time
    interval of throtl_slice.
    A small throtl_slice meanse cgroups have smoother throughput but burn
    more CPUs. It has 100ms default value, which is not appropriate for all
    disks. A fast SSD can dispatch a lot of IOs in 100ms. This patch makes
    it tunable.
    Since throtl_slice isn't a time slice, the sysfs name
    'throttle_sample_time' reflects its character better.
    Signed-off-by: default avatarShaohua Li <shli@fb.com>
    Signed-off-by: default avatarJens Axboe <axboe@fb.com>
blk-sysfs.c 23 KB