Re: [libvirt] cgroup memoryinfo handling
As per the 'virsh memtune' how are the items :hard_limit, soft_limit,
min_guarantee mapped to the items mentioned in RedHat 'Resource
Manangement Guide' , such as : memory.limit_in_bytes etc.
thanks
Zvi Dubitzky
Email:dubi@il.ibm.com
Eric Blake <eblake(a)redhat.com> wrote on 24/03/2011 20:21:40:
From: Eric Blake <eblake(a)redhat.com>
To: Zvi Dubitzky/Haifa/IBM@IBMIL
Cc: libvir-list(a)redhat.com
Date: 24/03/2011 20:22
Subject: Re: [libvirt] cgroup memoryinfo handling
On 03/24/2011 12:04 PM, Zvi Dubitzky wrote:
> Hi
>
> 1) Daniel Smith of IBM wrote (2008) code for implementing 'virsh
> schedinfo' in src/util/cgroup.c
> He also added some code for cgroup memory subsystem
(util/cgroup.c/
> virCgroupSetMemoryHardLimit () etc.),
> I see also src/qemu_driver.c/qemuDomainSetMemoryParameters()
> But that seems not being invoked . I am looking at libvirt-0.8.8
>
> 2) Is anybody handling/completing this piece of code and are you
libvirt
> guys interested in us completing it
> because we might find usage for that kind of 'virsh meminfo'
command
> using cgroups .
Your wish has already been mostly granted. 0.8.5 introduced the 'virsh
memtune' command to both query and set memory parameters (so it wraps
both qemuDomainGetMemoryParameters and qemuDomainSetMemoryParameters),
and the upcoming 0.9.0 offers a few improvements to that interface as
well as a counterpart 'virsh blkiotune' for the blkio cgroup.
The 'virsh meminfo' command cannot easily change its output for
backwards compatibility reasons, which is why we added the new
functionality in 'virsh memtune' instead.
You are also welcome to submit more patches or ideas for patches.
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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