[Xen-devel] how mem-set / balloon changes totalram_pages

To:	"Xen Developers" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject:	[Xen-devel] how mem-set / balloon changes totalram_pages
From:	weiming <zephyr.zhao@xxxxxxxxx>
Date:	Thu, 15 Nov 2007 22:41:57 -0500
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Hi,

I find that after I use xm mem-set to change the current memory
allocation of a dom, the MemTotal in /proc/meminfo will give the
current allocation.

In my understanding, the balloon driver simply alloc / free pages, so
the MemTotal should not be changed. Only the free memory will be
affected.

In normal linux, the value of MemTotal comes from "totalram_pages"
defined in arch/i386/mm/init.c

I tried to located the code in Xen, which changes the variable, but I
didn't find such code.

I tried to locate the implementation of  HYPERCALL_memory_op, but I
can only traced to
"call hypercall_page + STR(...)"

Can someone tell me where I can find the actual implementation of
those hypercalls?


Thanks in advance!

weiming

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[Xen-devel] how mem-set / balloon changes totalram_pages