[Xen-API] Problem with dynamic memory

[George Shuklin <george.shuklin@xxxxxxxxx>]

Good day.

Continue to research that issue.

Current state:

PV guest, static_min=500MiB, static_max=1GiB, dynamic=800MiB, domid=2

manually create /local/domain/2/control/feature_balloon.

Do xe vm-memory-target-set uuid=... target=650MiB

squeezed debug:

20120707T03:00:57Z Request for 
squeezed/balance-memory/3c46cc6a-c1df-deab-1aed-0b0ad939961b
20120707T03:00:57Z listdir 
/squeezed/rpc/request/balance-memory/3c46cc6a-c1df-deab-1aed-0b0ad939961b
[430.86] change_host_free_memory required_mem = 9216 KiB
[430.86] total_range = 0 gamma = 1.000000 gamma' = inf
[430.86] Total additional memory over dynamic_min = 22547476 KiB; will 
set gamma = 1.00 (leaving unallocated 0 KiB)
[430.86] Maximum possible free memory if all active domains balloon down 
to dynamic_min = 22556692
[430.86] current host free mem = 22556692 KiB (aiming for 9216 KiB);; 
all domain targets reached; however about to adjust targets; allocation 
phase
[430.86] F22556692 S0 R0 T25156584; 0 T1641472 A1641472 M0 Bxx; 2 
T614400 A614400 M614400 Bx^
[430.86] Xenctrl.domain_setmaxmem domid=2 max=665600 (was=614400)
[431.87] total_range = 0 gamma = 1.000000 gamma' = inf
[431.87] Total additional memory over dynamic_min = 22496276 KiB; will 
set gamma = 1.00 (leaving unallocated 0 KiB)
[431.87] Maximum possible free memory if all active domains balloon down 
to dynamic_min = 22505492
[431.87] current host free mem = 22505492 KiB (aiming for 9216 KiB); 
cannot allocate enough; all domain targets reached; allocation phase
[431.87] F22505492 S0 R0 T25156584; 0 T1641472 A1641472 M0 Bxx; 2 
T665600 A665600 M665600 Bxx
[431.87] Failed to free 9216 KiB of memory: operation impossible within 
current dynamic_min limits of balloonable domains
[431.87] balance memory caught: Squeeze.Cannot_free_this_much_memory(_, _)

I've not completely understand last lines. Host contains more than 
enough memory:
xentop shows 22505492k free for host memory. dom0_mem is about 1.5GiB.


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