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Re: [Qemu-devel] [PATCH] block/throttle: Use host clock type

From: Alberto Garcia
Subject: Re: [Qemu-devel] [PATCH] block/throttle: Use host clock type
Date: Fri, 13 Mar 2015 13:23:29 +0100
User-agent: Mutt/1.5.20 (2009-06-14)

On Fri, Mar 13, 2015 at 02:35:29PM +0800, Fam Zheng wrote:

> Throttle timers won't make any progress when VCPU is not running,
> which is prone to stall the request queue in cases like utils,
> qtest, suspending, and live migration, unless carefully handled.

Yes, this can be easily reproduced by stopping the VM and starting a
block-commit job. If the I/O in that device is throttled then the job
will be stalled.

Then there's also the situation that we discussed in IRC: if the
block-commit job is ongoing and then we stop the VM, then the rest of
the data will be committed bypassing the throttling settings.  But
that's not related to these changes.

> Signed-off-by: Fam Zheng <address@hidden>
> ---
>  block.c               |  2 +-
>  tests/test-throttle.c | 14 +++++++-------
>  2 files changed, 8 insertions(+), 8 deletions(-)

Reviewed-By: Alberto Garcia <address@hidden>


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