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Re: [PATCH v2 for 5.2 0/3] block: add logging facility for long standing
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From: |
Stefan Hajnoczi |
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Subject: |
Re: [PATCH v2 for 5.2 0/3] block: add logging facility for long standing IO requests |
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Date: |
Wed, 12 Aug 2020 15:00:09 +0100 |
On Mon, Aug 10, 2020 at 01:14:44PM +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.
>
> Changed from v2:
> - removed accidentally added slirp subproject ID
> - added comment describing timeout selection to patch 3
>
> Changes from v1:
> - fixed conversions using macros suggested by Stefan
> - fixed option declaration
> - enabled by default with patch 3
>
> 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>
> CC: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
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