On Mon, Nov 28, 2016 at 05:21:48PM -0500, Tejun Heo wrote:
> Hello, Shaohua.
>
> On Wed, Nov 23, 2016 at 05:15:18PM -0800, Shaohua Li wrote:
> > > Hmm... I'm not sure thinktime is the best measure here. Think time is
> > > used by cfq mainly to tell the likely future behavior of a workload so
>
Hello, Shaohua.
On Wed, Nov 23, 2016 at 05:15:18PM -0800, Shaohua Li wrote:
> > Hmm... I'm not sure thinktime is the best measure here. Think time is
> > used by cfq mainly to tell the likely future behavior of a workload so
> > that cfq can take speculative actions on the prediction. However,
Hello, Shaohua.
On Mon, Nov 14, 2016 at 02:22:17PM -0800, Shaohua Li wrote:
> Unfortunately it's very hard to determine if a cgroup is real idle. This
> patch uses the 'think time check' idea from CFQ for the purpose. Please
> note, the idea doesn't work for all workloads. For example, a workload
A cgroup gets assigned a high limit, but the cgroup could never dispatch
enough IO to cross the high limit. In such case, the queue state machine
will remain in LIMIT_HIGH state and all other cgroups will be throttled
according to high limit. This is unfair for other cgroups. We should
treat the
