* Peter Lieven (p...@kamp.de) wrote: > Am 21.06.2016 um 15:18 schrieb Dr. David Alan Gilbert: > > * Peter Lieven (p...@kamp.de) wrote: > > > Hi, > > > > > > while upgrading from Qemu 2.2.0 to Qemu 2.5.1.1 I noticed that the RSS > > > memory usage has heavily increased. > > > We use hugepages so the RSS memory does not include VM memory. In Qemu > > > 2.2.0 it used to be ~30MB per vServer > > > and increased to up to 300 - 400MB for Qemu 2.5.1.1 (same with master). > > > The memory increases over time, but seems > > > not to grow indefinetly. I tried to bisect, but had no result so far that > > > made sense. I also tried valgrind / massif, but > > > valgrind does not see the allocation (at least at exit) and massif fails > > > to rund due to - so it pretends - heap corruption. > > > > > > Any help or ideas how to debug further would be appreciated. > > I think I'd try stripping devices off; can you get a similar difference > > to happen with a guest with no USB, no hugepages, no VGA and a simple > > locally stored IDE disk? > > > > If you're having trouble bisecting is it possible it's a change > > in one of the libraries it's linked against? > > > > There was someone asking the other day on #qemu who had a setup that > > was apparently using much more RAM than expected and we didn't > > manage to track it down but I can't remember the version being used. > > I currently trying to track the increased usage from release to release. The > first increase of RSS usage from ~25MB to ~35MB directly > after machine setup is introduced by this patch:
OK, while 10MB is bad, I'm more interested in where your other 270MB have gone - hopefully it's not 27 separate 10MB chunks! Dave > > commit ba3f4f64b0e941b9e03568b826746941bef071f9 > Author: Paolo Bonzini <pbonz...@redhat.com> > Date: Wed Jan 21 12:09:14 2015 +0100 > > exec: RCUify AddressSpaceDispatch > > Note that even after this patch, most callers of address_space_* > functions must still be under the big QEMU lock, otherwise the memory > region returned by address_space_translate can disappear as soon as > address_space_translate returns. This will be fixed in the next part > of this series. > > Reviewed-by: Fam Zheng <f...@redhat.com> > Signed-off-by: Paolo Bonzini <pbonz...@redhat.com> > > @Paolo, @Fam, any idea? > > Thanks, > Peter > -- Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
