lkml.org 
[lkml]   [2013]   [Jul]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 04/16] mm: numa: Do not migrate or account for hinting faults on the zero page
On Thu, Jul 11, 2013 at 10:46:48AM +0100, Mel Gorman wrote:
> +++ b/mm/memory.c
> @@ -3560,8 +3560,13 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma,
> set_pte_at(mm, addr, ptep, pte);
> update_mmu_cache(vma, addr, ptep);
>
> + /*
> + * Do not account for faults against the huge zero page. The read-only

s/huge //

> + * data is likely to be read-cached on the local CPUs and it is less
> + * useful to know about local versus remote hits on the zero page.
> + */
> page = vm_normal_page(vma, addr, pte);
> - if (!page) {
> + if (!page || is_zero_pfn(page_to_pfn(page))) {
> pte_unmap_unlock(ptep, ptl);
> return 0;
> }
> --
> 1.8.1.4
>


\
 
 \ /
  Last update: 2013-07-11 14:01    [W:0.441 / U:0.288 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site