On 15/09/2014 10:41, 常怀鑫(一斋) wrote:
We are working on live-migration based on Xen-4.0.1(For history reason, and meantime we are upgrading our Xen to very latest version). Restore failed when live migrating ubuntu12.04 on xen-4.0.1. To be more specific, error occurred when populating memory. Error messages are as follow:

[2014-09-12 22:40:40 7331 1189091648] DEBUG (XendCheckpoint:307) [xc_restore]: /usr/lib64/xen/bin/xc_restore 4 2763 3 4 1 1 1 0
[2014-09-12 22:40:40 7331 1189091648] DEBUG (XendCheckpoint:428) Thread-40188
[2014-09-12 22:40:40 7331 1172306240] INFO (XendCheckpoint:476) Thread-40188:xc_domain_restore start: p2m_size = fefff
[2014-09-12 22:40:40 7331 1172306240] INFO (XendCheckpoint:476) Thread-40188:Reloading memory pages:   0%
[2014-09-12 22:40:50 7331 1172306240] INFO (XendCheckpoint:476) Thread-40188:Failed allocation for dom 2763: 128 extents of order 0
[2014-09-12 22:40:50 7331 1172306240] INFO (XendCheckpoint:476) Thread-40188:ERROR Internal error: Failed to allocate memory for batch.!
[2014-09-12 22:40:50 7331 1172306240] INFO (XendCheckpoint:476) Thread-40188:
[2014-09-12 22:40:50 7331 1172306240] INFO (XendCheckpoint:476) Thread-40188:Restore exit with rc=1
[2014-09-12 22:40:50 7331 1189091648] DEBUG (XendCheckpoint:462) /usr/lib64/xen/bin/xc_restore 4 2763 3 4 1 1 1 0 failed status 256
[2014-09-12 22:40:50 7331 1189091648] DEBUG (XendDomainInfo:3845) XendDomainInfo.destroy: domid=2763

In this case, populate_physmap terminated with nr_done 127.  So xc_memory_op return 127 while nr_extents equals 128.

This problem happends once every 1770th live migration or so. As I am debugging this issue, I'm sending this email to ask for suggestions on this issue.

Thanks,
Huaixin Chang

Xen is unable to fulfil the allocation request.  You have run out of host memory.

~Andrew