... otherwsie rpm -i throws an error when trying to set permissions for
/home_volatile/user, as the user 'user' doesn't exist when the %files section
is being processed during rpm install (if this is a first install of the rpm).
A small AppVM (say, with 100MB total) can go below prefmem, and
still not be assigned memory, because of the MIN_TOTAL_MEMORY_TRANSFER
threshold.
So, if AppVM is below prefmem, allow for smaller mem-sets.
Make meminfo-writer compute used memory, and report to qmemman only if
it has changed significantly enough. As it is written in C, its code is
much faster that qmemman-server; also in the idle case, it saves on xenstore
communication overhead. Allows to send updates up to 10 times per second,
with CPU load on the VM below 0.1%.
Previously, memory_actual (retrieved from xen) was used; it can be inconsistent.
'Memtotal' can be spoofed, but anyway we rely on other fields from /proc/meminfo.
Apparently even if there is not enough xen memory to balloon up,
balloon driver will try to fulfill the request later, when
some memory is freed. Thus, in do_balloon, do not limit mem_set
to the available memory.
Apparently, it interferes:
INFO (XendCheckpoint:417) ERROR Internal error: Could not get vcpu context
INFO (XendCheckpoint:417) ERROR Internal error: Failed to map/save the p2m frame list
Plus:
- dedicated chain for DNAT to nameservers
- prevent intervm networking. Can be conveniently overriden in necessary cases
by inserting ACCEPT clauses (per VM, probably) at the top of FORWARD
Now the balance() has two different cases: enough memory and low_on_memory.
In the former, distribute memory proportianally; in the former, dont do this, as this
makes a VM go below prefmem.
File "/usr/lib64/python2.6/xmlrpclib.py", line 710, in dump_int
raise OverflowError, "int exceeds XML-RPC limits"
OverflowError: int exceeds XML-RPC limits
How crappy.
It can fail e.g. when a domain is being shutdown with a pretty
message like
File "/usr/lib64/python2.6/site-packages/xen/xend/XendDomainInfo.py", line 1322, in setMemoryTarget
(target * 1024))
Error: (1, 'Operation not permitted')
