On 09/09/2010 04:16 AM, Liu Yu-B13201 wrote:
Yes, it's hard to resume TLB0. We only resume TLB1 in previous code.
But TLB1 is even more smaller (13 free entries) than 440,
So that it still has little possibility to get hit.
thus the resumption is useless.
The only reason hits are unlikely in TLB1 is because you still don't
have large page support in the host. Once you have that, you can use
TLB1 for large guest mappings, and it will become extremely likely that
you get hits in TLB1. This is true even if the guest wants 256MB but the
host supports only e.g. 16MB large pages, and must split the guest
mapping into multiple large host pages.
When will you have hugetlbfs for e500? That's going to make such a
dramatic difference, I'm not sure it's worth investing time in
optimizing the MMU code until then.
Hollis Blanchard
Mentor Graphics, Embedded Systems Division
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