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[Xen-devel] libxc DPRINTF statements

I am trying to make some modifications to the live migration part of Xen code. 
As a first step in this direction i want to figure out how many pages were 
dirtied in each round of live migration. I compiled the latest xen-unstable-4.2 
version. Through some effort i have been able to figure out that the sending 
part of live migration code resides in 
xen-unstable/tools/libxc/xc_domain_save.c. This file has a number of DPRINTF 
statements in it, but i don't see these statements in either 
/var/log/xen/xend.log or xend-debug.log. Where do these DPRINTF statements go ? 
How do i turn these DPRINTF statements on ?

Thanking you,
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