[Qemu-devel] [RFC 0/3] qga: add guest-get-memory-info (for 2.5)

[marcandre.lureau@redhat.com]

From: Marc-André Lureau <marcandre.lureau@redhat.com>

This series implement a new qemu guest agent command to get memory
information from the guest. This is based on ovirt-guest-agent
"memory-stats" message.

I couldn't find documentation for the ovirt message, but the list of
fields are summarized in this test
https://github.com/oVirt/ovirt-guest-agent/blob/master/tests/message_validator.py#L137
and according to how they are populated in the code, I adapted it to
the following GuestMemoryInfo structure fields:

 - mem-total: Total usable RAM.
 - mem-free:  Total of RAM that can be used without having to swap contents to disk.
 - mem-cached: In-RAM cache.
 - swap-total: Total amount of swap space available.
 - swap-free: Amount of swap space that is currently unused.
 - swap-in: Number of pages swapped-in per second.
 - swap-out: Number of pages swapped-out per second.
 - pf-major: Number of major page fault per second.
 - pf-minor: Number of minor page fault per second.

Implemented on Linux and Win32 based on ovirt implementations.

Note: the "per second" value differ between Linux and Win32. On Linux,
the value is computed based on the average since the last query,
however on win32 this seems to be an instantaneous value (they have
spikes, but often at 0). I have asked for help on SF:

http://serverfault.com/questions/709943/windows-equivalent-of-linux-vmstat-pswpin-and-pgfault

Related to RFE:
https://bugzilla.redhat.com/show_bug.cgi?id=1101915

Marc-André Lureau (3):
  qga: add guest-get-memory-info json
  qga: implement get-memory-info for Linux
  qga: implement get-memory-info on win32

 configure            |   1 +
 qga/commands-posix.c | 102 +++++++++++++++++++++++++++++++
 qga/commands-win32.c | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++
 qga/main.c           |  28 +++++++++
 qga/qapi-schema.json |  48 +++++++++++++++
 5 files changed, 345 insertions(+)

-- 
2.4.3