Re: [PATCH 0/6 v5.1] cfq-iosched: Introduce CFQ group hierarchicalscheduling and "use_hierarchy" interface

From: Vivek Goyal
Date: Sun Feb 27 2011 - 18:16:46 EST

On Fri, Feb 25, 2011 at 09:55:32AM +0800, Gui Jianfeng wrote:
> Vivek Goyal wrote:
> > On Wed, Feb 23, 2011 at 11:01:35AM +0800, Gui Jianfeng wrote:
> >> Hi
> >>
> >> I rebase this series on top of *for-next* branch, it will make merging life easier.
> >>
> >> Previously, I posted a patchset to add support of CFQ group hierarchical scheduling
> >> in the way that it puts all CFQ queues in a hidden group and schedules with other
> >> CFQ group under their parent. The patchset is available here,
> >>
> >
> > Gui,
> >
> > I was running some tests (iostest) with these patches and my system crashed
> > after a while.
> >
> > To be precise I was running "brrmmap" test of iostest.
> Vivek,
> I simply run iostest with brrmmap mode, I can't reproduce this bug.
> Would you give more details.
> Can you tell me the iostest command line options?

iostest /dev/dm-1 -G --nrgrp 4 -m 8 --cgtime --io_serviced --dequeue --total

I was actually trying to run all the workloads defined but after running
2 workloads it crashed on 3rd workload.

Now I tried to re-run brrmmap and it did not crash. So I am trying to run
all the inbuilt workloads again.

> Did you enable use_hierarchy in root group?

No I did not. Trying to test the flat setup first.

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