[libvirt] [PATCH 2/2] qemu: New XML to disable memory merge at guest startup
Osier Yang
jyang at redhat.com
Tue May 14 05:30:33 UTC 2013
On 14/05/13 13:25, Osier Yang wrote:
> QEMU introduced command line "-mem-merge=on|off" (defaults to on) to
> enable/disable the memory merge (KSM) at guest startup. This exposes
> it by new XML:
> <memoryBacking>
> <nosharepages/>
> </memoryBacking>
>
> The XML tag is same with what we used internally for old RHEL.
> ---
> docs/formatdomain.html.in | 13 ++++++---
> docs/schemas/domaincommon.rng | 5 ++++
> src/conf/domain_conf.c | 20 +++++++++-----
> src/conf/domain_conf.h | 1 +
> src/qemu/qemu_command.c | 22 +++++++++++++++
> tests/qemuargv2xmltest.c | 2 ++
> .../qemuxml2argv-nosharepages.args | 4 +++
> .../qemuxml2argvdata/qemuxml2argv-nosharepages.xml | 31 ++++++++++++++++++++++
> tests/qemuxml2argvtest.c | 1 +
> tests/qemuxml2xmltest.c | 1 +
> 10 files changed, 90 insertions(+), 10 deletions(-)
> create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-nosharepages.args
> create mode 100644 tests/qemuxml2argvdata/qemuxml2argv-nosharepages.xml
>
> diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
> index 9ade507..3a6c18f 100644
> --- a/docs/formatdomain.html.in
> +++ b/docs/formatdomain.html.in
> @@ -561,6 +561,7 @@
> ...
> <memoryBacking>
> <hugepages/>
> + <nosharepages/>
> </memoryBacking>
> ...
> </domain>
> @@ -568,10 +569,14 @@
>
> <dl>
> <dt><code>memoryBacking</code></dt>
> - <dd>The optional <code>memoryBacking</code> element, may have an
> - <code>hugepages</code> element set within it. This tells the
> - hypervisor that the guest should have its memory allocated using
> - hugepages instead of the normal native page size.</dd>
> + <dd>The optional <code>memoryBacking</code> element has two
> + optional elements. The element <code>hugepages</code> tells
> + the hypervisor that the guest should have its memory allocated
> + using hugepages instead of the normal native page size. And the
> + optional element <code>nosharepages</code> tells the hypervisor
> + that share pages (memory merge, KSM) should be disabled on guest
> + startup.
> + </dd>
> </dl>
>
>
With the attached diff squashed in:
-------------- next part --------------
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 3a6c18f..df772b5 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -573,7 +573,8 @@
optional elements. The element <code>hugepages</code> tells
the hypervisor that the guest should have its memory allocated
using hugepages instead of the normal native page size. And the
- optional element <code>nosharepages</code> tells the hypervisor
+ optional element <code>nosharepages</code>
+ (<span class="since">since 1.0.6</span>) tells the hypervisor
that share pages (memory merge, KSM) should be disabled on guest
startup.
</dd>
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