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SubjectRe: [PATCH 2/2] Documentation: clarify in calculating zone protection
On Tue 25-08-15 22:01:31, Yaowei Bai wrote:
> Every zone's protection is calculated from managed_pages not
> present_pages, to avoid misleading, correct it.

This can be folded in to your previous patch
http://marc.info/?l=linux-mm&m=144023106610358&w=2

>
> Signed-off-by: Yaowei Bai <bywxiaobai@163.com>
> ---
> Documentation/sysctl/vm.txt | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
> index 9832ec5..1739b31 100644
> --- a/Documentation/sysctl/vm.txt
> +++ b/Documentation/sysctl/vm.txt
> @@ -349,7 +349,7 @@ zone[i]'s protection[j] is calculated by following expression.
>
> (i < j):
> zone[i]->protection[j]
> - = (total sums of present_pages from zone[i+1] to zone[j] on the node)
> + = (total sums of managed_pages from zone[i+1] to zone[j] on the node)
> / lowmem_reserve_ratio[i];
> (i = j):
> (should not be protected. = 0;
> @@ -360,7 +360,7 @@ The default values of lowmem_reserve_ratio[i] are
> 256 (if zone[i] means DMA or DMA32 zone)
> 32 (others).
> As above expression, they are reciprocal number of ratio.
> -256 means 1/256. # of protection pages becomes about "0.39%" of total present
> +256 means 1/256. # of protection pages becomes about "0.39%" of total managed
> pages of higher zones on the node.
>
> If you would like to protect more pages, smaller values are effective.
> --
> 1.9.1
>
>
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--
Michal Hocko
SUSE Labs


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