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Re: [PATCH 0/2] block: add logging facility for long standing IO request
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [PATCH 0/2] block: add logging facility for long standing IO requests |
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Date: |
Wed, 29 Jul 2020 11:31:39 +0100 |
On Fri, Jul 10, 2020 at 08:27:09PM +0300, Denis V. Lunev wrote:
> There are severe delays with IO requests processing if QEMU is running in
> virtual machine or over software defined storage. Such delays potentially
> results in unpredictable guest behavior. For example, guests over IDE or
> SATA drive could remount filesystem read-only if write is performed
> longer than 10 seconds.
>
> Such reports are very complex to process. Some good starting point for this
> seems quite reasonable. This patch provides one. It adds logging of such
> potentially dangerous long IO operations.
>
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
> CC: Kevin Wolf <kwolf@redhat.com>
> CC: Max Reitz <mreitz@redhat.com>
This looks useful. It is indeed hard to diagnose soft lockups, I/O
timeouts, etc inside the guest :). QEMU should print more info. Thanks
for doing this!
Stefan
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