linux-kernel - Re: [PATCH 2/2] Documentation: clarify in calculating zone protection

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Date:	Tue, 25 Aug 2015 17:06:33 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Yaowei Bai <bywxiaobai@....com>
Cc:	akpm@...ux-foundation.org, mgorman@...e.de, vbabka@...e.cz,
	js1304@...il.com, hannes@...xchg.org, alexander.h.duyck@...hat.com,
	sasha.levin@...cle.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [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@....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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