Re: [Xen-devel] Implementing working set tracker in xen

[HANNAS YAYA Issa <issa.hannasyaya@xxxxxxxxxxx>]

Thank you a lot Tim.Your Method which consist of using shadow page 
table help me.
However when I use the method shadow_blow_tables() I don't think it 
makes all page unavailable.
because the the number of page fault (I get it from sh_page_fault) does 
not seem to increase.
when shadow_blow_tables() is called this code is executed:

for_each_vcpu(d, v)
        for ( i = 0 ; i < 4 ; i++ )
            if ( !pagetable_is_null(v->arch.shadow_table[i]) )
                shadow_unhook_mappings(v,
                               
pagetable_get_mfn(v->arch.shadow_table[i]), 0);
I wonder about the '4' in the for loop. does it means that there is 
only 4 shadow page table per-vcpu?
Thank you

On Thu, 19 Mar 2015 16:34:46 +0000, Tim Deegan wrote:
> Hi,
> Ah, no -- for PV guests you can't use the mem_event interface. :(
> And the log-dirty code isn't quite what you want.  But you could,
> e.g., turn on shadow pagetables mode and track when frames are
> accessed in the sh_page_fault() path.  shadow_blow_tables() will then
> make all pages unavailable again.  If you want to make only some 
> pages
> unavailable, you'll have to think of something cleverer. :)
>
> Cheers,
>
> Tim.

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