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conf: Introduce thread_pool_min and thread_pool_max attributes to IOThread

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At least in case of QEMU an IOThread is actually a pool of
threads (see iothread_set_aio_context_params() in QEMU's code
base). As such, it can have minimal and maximal number of worker
threads. Allow setting them in domain XML.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
This commit is contained in:
Michal Privoznik
2022-03-07 15:13:39 +01:00
parent f899276737
commit 568503edf1
8 changed files with 140 additions and 4 deletions
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6
docs/formatdomain.rst
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@@ -675,7 +675,7 @@ host/guest with many LUNs. :since:`Since 1.2.8 (QEMU only)`
<iothread id="2"/>
<iothread id="4"/>
<iothread id="6"/>
<iothread id="8"/>
<iothread id="8" thread_pool_min="2" thread_pool_max="32"/>
</iothreadids>
...
</domain>
@@ -696,6 +696,10 @@ host/guest with many LUNs. :since:`Since 1.2.8 (QEMU only)`
any predefined ``id``. If there are more ``iothreadids`` defined than
``iothreads`` defined for the domain, then the ``iothreads`` value will be
adjusted accordingly. :since:`Since 1.2.15`
The element has two optional attributes ``thread_pool_min`` and
``thread_pool_max`` which allow setting lower and upper boundary for number
of worker threads for given IOThread. While the former can be value of zero,
the latter can't. :since:`Since 8.5.0`
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