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Re: [PATCH v2 for 5.2 0/3] block: add logging facility for long standing
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From: |
Denis V. Lunev |
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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: |
Thu, 20 Aug 2020 10:37:43 +0300 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 |
On 8/12/20 5:00 PM, Stefan Hajnoczi wrote:
> 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>
ping