On Fri, Mar 08, 2019 at 12:22:20PM -0500, Josef Bacik wrote:
> On Thu, Mar 07, 2019 at 07:08:31PM +0100, Andrea Righi wrote:
> > = Problem =
> >
> > When sync() is executed from a high-priority cgroup, the process is forced
> > to
> > wait the completion of the entire outstanding writeback I/O,
On Thu, Mar 07, 2019 at 07:08:31PM +0100, Andrea Righi wrote:
> = Problem =
>
> When sync() is executed from a high-priority cgroup, the process is forced to
> wait the completion of the entire outstanding writeback I/O, even the I/O that
> was originally generated by low-priority cgroups
= Problem =
When sync() is executed from a high-priority cgroup, the process is forced to
wait the completion of the entire outstanding writeback I/O, even the I/O that
was originally generated by low-priority cgroups potentially.
This may cause massive latencies to random processes (even those
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