linux-kernel - Re: [PATCH V2] mm: Some arch may want to use HPAGE

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Message-ID: <20160209231457.GB22327@node.shutemov.name>
Date:	Wed, 10 Feb 2016 01:14:57 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	mpe@...erman.id.au,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] mm: Some arch may want to use HPAGE_PMD related
 values as variables

On Tue, Feb 09, 2016 at 01:26:08PM -0800, Andrew Morton wrote:
> On Tue,  9 Feb 2016 21:41:44 +0530 "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com> wrote:
> > @@ -660,6 +660,18 @@ static int __init hugepage_init(void)
> >  		return -EINVAL;
> >  	}
> >  
> > +	khugepaged_pages_to_scan = HPAGE_PMD_NR * 8;
> > +	khugepaged_max_ptes_none = HPAGE_PMD_NR - 1;
> 
> I don't understand this change.  We change the initialization from
> at-compile-time to at-run-time, but nothing useful appears to have been
> done.

It's preparation patch. HPAGE_PMD_NR is going to be based on variable on
Power soon. Compile-time is not an option.

-- 
 Kirill A. Shutemov