[libvirt] [PATCH 0/7] Add more options for IOThreads
Ján Tomko
jtomko at redhat.com
Mon Sep 15 15:04:50 UTC 2014
On 09/03/2014 06:15 PM, John Ferlan wrote:
> The following patches will add more support for IOThreads not completed
> from the initial patches. These changes support the remaining elements of
> bz https://bugzilla.redhat.com/show_bug.cgi?id=1101574 (working through
> unsetting the private bits - as there's nothing in there that should
> necessarily be private).
>
> Changes:
>
> 1. Add "--iothread" option to virsh attach-disk to allow using a specific
> iothread when attaching a disk
>
> 2. Add the ability to set CPU affinity for an IOThread. This involves
> multiple steps (patches 2-6) of adding the infrastructure to support
> setting scheduler affinity for the IOThread including cgroup setup.
> For the most part it's a "copy" of the vCPU pinning code, but without
> the external interfaces - those will come at a later time after RHEL7.1.
>
> 3. Add to <cpuset/> a new element <iothreadpin iothread='#" cpuset="string"/>
>
> NOTE: I can combine any/all of patches 2-6 - I just kept them separate
> so it wasn't a larger single patch.
IMO the split is fine as-is (maybe with the exception of the little cleanup in
5/7).
> John Ferlan (7):
> virsh: Add iothread to 'attach-disk'
> qemu: Issue query-iothreads and to get list of active IOThreads
> vircgroup: Introduce virCgroupNewIOThread
> qemu_domain: Add niothreadpids and iothreadpids
> qemu_cgroup: Introduce cgroup functions for IOThreads
> qemu: Allow pinning specific IOThreads to a CPU
> domain_conf: Add iothreadpin to cputune
>
...
> 22 files changed, 717 insertions(+), 15 deletions(-)
> create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-cputune-iothreads.xml
>
Looks good to me as well.
ACK series.
Jan
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