On 08/28/2017 01:11 PM, Tomáš Golembiovský wrote:
Hi,there is ongoing effort to change how VDSM collects information about memory usage from guests. We used to use oVirt guest agent to get the statistics about free memory, swap usage, etc. This is going to change and we will use stats provided by VirtIO Balloon driver. [1] This should not break MOM nor Engine (current or previous versions). There is however small downside to this change. We will not be able to fetch information about buffers and caches on Linux guests anymore (mem_cached and mem_buffers in memoryStats). The corollary of this is that free memory reported by Engine will also no longer include those statistics and reported free memory will be really (only) free memory. I now there will be mixed feelings about this and we would like to get the information about buffers and caches back to the VDSM. Correctly via balloon driver statistics. [2] This effort will however take some time. Tomas [1] https://gerrit.ovirt.org/#/q/topic:memory-stats [2] https://lists.nongnu.org/archive/html/qemu-devel/2017-08/msg05239.html
Note that this information is currently reported by the engine REST API, so it is part of its contract. Removing it breaks backwards compatibility and causes a regression in this RFE:
[RFE] Report guests Buffered/Cached memory https://bugzilla.redhat.com/1024010 _______________________________________________ Devel mailing list Devel@ovirt.org http://lists.ovirt.org/mailman/listinfo/devel
