[libvirt] Inconsistency with documentation virDomainGetMaxMemory(NULL)
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I was making a some test code to checkout some code before I start on my
brand new Invite/Tender cluster distribution engine(tm ;)
From docs:
Retrieve the maximum amount of physical memory allocated to a domain. If
domain is NULL, then this get the amount of memory reserved to Domain0
i.e. the domain where the application runs.
skinkie@xenapi ~/development/htdocs/cherokee $ ./experiment
libvir: Domain error : invalid domain pointer in virDomainGetMaxMemory
0
262144
Code:
printf("%ld\n", virDomainGetMaxMemory(NULL));
virDomainPtr domu = virDomainLookupByName(conn, "klant1_gentoo");
printf("%ld\n", virDomainGetMaxMemory(domu));
virDomainFree(domu);
Stefan
Stefan de Konink
Saturday, 19 July
Sat, 19 Jul
10:09 p.m.
New subject: [libvirt] Inconsistency with documentation virDomainGetMaxMemory(NULL)
Stefan de Konink schreef:
From docs:
Retrieve the maximum amount of physical memory allocated to a domain. If
domain is NULL, then this get the amount of memory reserved to Domain0
i.e. the domain where the application runs.
Doing it the 'proper' way gives an even more interesting answer:
virDomainPtr domu = virDomainLookupByID(conn, 0);
printf("%ld\n", virDomainGetMaxMemory(domu));
17179869180
Now...
MemTotal: 7990272 kB
MemFree: 7527312 kB
Buffers: 44400 kB
Cached: 50440 kB
SwapCached: 0 kB
Active: 133236 kB
Inactive: 63764 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 476 kB
Writeback: 0 kB
AnonPages: 102216 kB
Mapped: 10848 kB
Slab: 20428 kB
SReclaimable: 7800 kB
SUnreclaim: 12628 kB
PageTables: 2648 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 3995136 kB
Committed_AS: 568940 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 412 kB
VmallocChunk: 34359737775 kB
That doesn't make sense.
Stefan
Stefan de Konink
10:33 p.m.
New subject: [libvirt] Inconsistency with documentation virDomainGetMaxMemory(NULL)
Stefan de Konink schreef:
Stefan de Konink schreef:
> From docs:
>
> Retrieve the maximum amount of physical memory allocated to a domain.
> If domain is NULL, then this get the amount of memory reserved to
> Domain0 i.e. the domain where the application runs.
Doing it the 'proper' way gives an even more interesting answer:
Checking the free memory also results in strange measures:
printf("%llu\n", virNodeGetFreeMemory(conn));
28672
That doesn't make sense.
I'm running the lastest git version of libvirt...
Stefan
Stefan de Konink
10:59 p.m.
New subject: [libvirt] Inconsistency with documentation virDomainGetMaxMemory(NULL)
Stefan de Konink schreef:
> That doesn't make sense.
I'm running the lastest git version of libvirt...
And it seems libvirt cannot handler ballooning. With a hard
dom0_mem=limit, I get good values back. Never the less, xm info also
returned 0 with the ballooning on.
Stefan
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Stefan de Konink