Robin Holt wrote on Wednesday, April 12, 2006 8:15 PM
> This patch modifies ia64's show_mem() to walk the vmem_map page tables and
> rapidly skip forward across regions where the page tables are missing.
> This prevents the pfn_valid() check from causing numerous unnecessary
> page faults.
>
> Without this patch on a 512 node 512 cpu system where every node has four
> memory holes, the show_mem() call takes 1 hour 18 minutes. With this
> patch, it takes less than 3 seconds.
If you are going to respin another rev, please consider the following.
no biggy, just some cosmetic stuff.
> + pgd = pgd_offset_k(end_address);
> + if (pgd_none(*pgd)) {
> + end_address += PTRS_PER_PUD *
> + PTRS_PER_PMD *
> + PTRS_PER_PTE *
> + PAGE_SIZE;
end_address += PGDIR_SIZE;
> + pud = pud_offset(pgd, end_address);
> + if (pud_none(*pud)) {
> + end_address += PTRS_PER_PMD *
> + PTRS_PER_PTE *
> + PAGE_SIZE;
end_address += PUD_SIZE;
> +
> + pmd = pmd_offset(pud, end_address);
> + if (pmd_none(*pmd)) {
> + end_address += PTRS_PER_PTE *
> + PAGE_SIZE;
end_address += PMD_SIZE;
-
: send the line "unsubscribe linux-ia64" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|