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

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Date:	Wed, 26 Aug 2015 22:29:06 +0800
From:	Yaowei Bai <bywxiaobai@....com>
To:	Michal Hocko <mhocko@...nel.org>
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, Aug 25, 2015 at 05:06:33PM +0200, Michal Hocko wrote:
> 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

OK, thanks.

> 
> > 
> > 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
> > 
> > 
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
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> > Please read the FAQ at  http://www.tux.org/lkml/
> 
> -- 
> Michal Hocko
> SUSE Labs

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