Re: [patch 3/3] kvm test: long rmap chains

[Avi Kivity <avi@redhat.com>]

On 07/05/2010 09:16 PM, Marcelo Tosatti wrote:
> test long rmap chains
>
> +
> +int main (void)
> +{
> +    int i;
> +    int nr_pages;
> +    void *target_page, *virt_addr;
> +
> +    setup_vm();
> +
> +    nr_pages = inl(0xd1) / PAGE_SIZE;
> +    nr_pages -= 1000;
>    

No need to depend on the number of physical pages, since just one page 
is used (+ 1/512 page for the pte).

> +    target_page = alloc_page();
> +
> +    virt_addr = (void *) 0xfffffa000;
> +    for (i = 0; i<  nr_pages; i++) {
> +        install_page(phys_to_virt(read_cr3()), virt_to_phys(target_page),
> +                     virt_addr);
> +        virt_addr += PAGE_SIZE;
> +    }
> +    printf("created %d mappings\n", nr_pages);
> +
> +    virt_addr = (void *) 0xfffffa000;
> +    for (i = 0; i<  nr_pages; i++) {
> +        unsigned long *touch = virt_addr;
> +
> +        *touch = 0;
> +        virt_addr += PAGE_SIZE;
> +    }
> +    printf("instantiated mappings\n");
> +
> +    virt_addr += PAGE_SIZE;
> +    install_pte(phys_to_virt(read_cr3()), 1, virt_addr,
> +                0 | PTE_PRESENT | PTE_WRITE, target_page);
> +
> +    *(unsigned long *)virt_addr = 0;
> +    printf("PASS\n");
> +
>    

Would be nice to add measure the time for this, and fail above some 
threshold.  Of course it's problematic in automated scenarios where the 
host can be overloaded, but still.

-- 
error compiling committee.c: too many arguments to function