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Add support for locking domain's memory pages

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The following XML configuration can be used to request all domain's
memory pages to be kept locked in host's memory (i.e., domain's memory
pages will not be swapped out):

      <memoryBacking>
        <locked/>
      </memoryBacking>
This commit is contained in:
Jiri Denemark 2013-05-16 22:00:03 +02:00
parent 4734f1f53b
commit 555866389c
4 changed files with 33 additions and 19 deletions
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26
docs/formatdomain.html.in
View File

@ -595,22 +595,28 @@
&lt;memoryBacking&gt; &lt;memoryBacking&gt;
&lt;hugepages/&gt; &lt;hugepages/&gt;
&lt;nosharepages/&gt; &lt;nosharepages/&gt;
&lt;locked/&gt;
&lt;/memoryBacking&gt; &lt;/memoryBacking&gt;
... ...
&lt;/domain&gt; &lt;/domain&gt;
</pre> </pre>
<p>The optional <code>memoryBacking</code> element may contain several
elements that influence how virtual memory pages are backed by host
pages.</p>
<dl> <dl>
<dt><code>memoryBacking</code></dt> <dt><code>hugepages</code></dt>
<dd>The optional <code>memoryBacking</code> element has two <dd>This tells the hypervisor that the guest should have its memory
optional elements. The element <code>hugepages</code> tells allocated using hugepages instead of the normal native page size.</dd>
the hypervisor that the guest should have its memory allocated <dt><code>nosharepages</code></dt>
using hugepages instead of the normal native page size. And the <dd>Instructs hypervisor to disable shared pages (memory merge, KSM) for
optional element <code>nosharepages</code> this domain. <span class="since">Since 1.0.6</span></dd>
(<span class="since">since 1.0.6</span>) tells the hypervisor <dt><code>locked</code></dt>
that share pages (memory merge, KSM) should be disabled on guest <dd>When set and supported by the hypervisor, memory pages belonging
startup. to the domain will be locked in host's memory and the host will not
</dd> be allowed to swap them out.
<span class="since">Since 1.0.6</span></dd>
</dl> </dl>

5
docs/schemas/domaincommon.rng
View File

@ -501,6 +501,11 @@
<empty/> <empty/>
</element> </element>
</optional> </optional>
<optional>
<element name="locked">
<empty/>
</element>
</optional>
</interleave> </interleave>
</element> </element>
</optional> </optional>

20
src/conf/domain_conf.c
View File

@ -10411,6 +10411,9 @@ virDomainDefParseXML(xmlDocPtr xml,
if ((node = virXPathNode("./memoryBacking/nosharepages", ctxt))) if ((node = virXPathNode("./memoryBacking/nosharepages", ctxt)))
def->mem.nosharepages = true; def->mem.nosharepages = true;
if (virXPathBoolean("boolean(./memoryBacking/locked)", ctxt))
def->mem.locked = true;
/* Extract blkio cgroup tunables */ /* Extract blkio cgroup tunables */
if (virXPathUInt("string(./blkiotune/weight)", ctxt, if (virXPathUInt("string(./blkiotune/weight)", ctxt,
&def->blkio.weight) < 0) &def->blkio.weight) < 0)
@ -15766,17 +15769,16 @@ virDomainDefFormatInternal(virDomainDefPtr def,
def->mem.swap_hard_limit) def->mem.swap_hard_limit)
virBufferAddLit(buf, " </memtune>\n"); virBufferAddLit(buf, " </memtune>\n");
if (def->mem.hugepage_backed || def->mem.nosharepages) if (def->mem.hugepage_backed || def->mem.nosharepages || def->mem.locked) {
virBufferAddLit(buf, " <memoryBacking>\n"); virBufferAddLit(buf, " <memoryBacking>\n");
if (def->mem.hugepage_backed)
if (def->mem.hugepage_backed) virBufferAddLit(buf, " <hugepages/>\n");
virBufferAddLit(buf, " <hugepages/>\n"); if (def->mem.nosharepages)
virBufferAddLit(buf, " <nosharepages/>\n");
if (def->mem.nosharepages) if (def->mem.locked)
virBufferAddLit(buf, " <nosharepages/>\n"); virBufferAddLit(buf, " <locked/>\n");
if (def->mem.hugepage_backed || def->mem.nosharepages)
virBufferAddLit(buf, " </memoryBacking>\n"); virBufferAddLit(buf, " </memoryBacking>\n");
}
virBufferAddLit(buf, " <vcpu"); virBufferAddLit(buf, " <vcpu");
virBufferAsprintf(buf, " placement='%s'", virBufferAsprintf(buf, " placement='%s'",

1
src/conf/domain_conf.h
View File

@ -1863,6 +1863,7 @@ struct _virDomainDef {
unsigned long long cur_balloon; /* in kibibytes */ unsigned long long cur_balloon; /* in kibibytes */
bool hugepage_backed; bool hugepage_backed;
bool nosharepages; bool nosharepages;
bool locked;
int dump_core; /* enum virDomainMemDump */ int dump_core; /* enum virDomainMemDump */
unsigned long long hard_limit; /* in kibibytes */ unsigned long long hard_limit; /* in kibibytes */
unsigned long long soft_limit; /* in kibibytes */ unsigned long long soft_limit; /* in kibibytes */