在 2015-07-06, Mon, 15:44:53 ,Andrew Cooper 写到：
On 06/07/2015 08:22, xinyue wrote:
Hi,
For I want to translate the virtual address
in HVM DomU to virtual address in Xen. But when I use the function
paging_gva_to_gfn and get_gfn, I can feel the performance down quickly, the
machine become very hot and then I have to force the machine shutting down.
Your machine clearly isn't cooled sufficiently, which is the first problem.
The codes I used as below:
uint32_t pfec = PFEC_page_present;
unsigned long gfn;
unsigned long mfn;
unsigned long virtaddr;
struct vcpu *vcpu = current;
struct domain *d = vcpu->domain;
gfn = paging_gva_to_gfn(current, 0xc0290000,
&pfec);
mfn = get_gfn(d, gfn, &t);
virtaddr = map_domain_page(mfn_x(mfn));
I also use the dbg_hvm_va2mfn function in debug.c, performance
problem still present.
Walking pagetables in software is slow. There is no getting around this.
Your performance problems will be caused by performing the operation far too
often. You should find a way to reduce this.
Thanks very much, I think I only do this for just once. And after the
thanslation is done, the performance is not turn to normal. Does that mean that
if I wait long enough it will recovery?
~Andrew
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xen.org
http://lists.xen.org/xen-devel
