linux-kernel - Re: [PATCH 2/9] migrate: make core migration code aware of hugepage

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Message-ID: <20130318153300.GR10192@dhcp22.suse.cz>
Date:	Mon, 18 Mar 2013 16:33:00 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Cc:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mel@....ul.ie>, Hugh Dickins <hughd@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/9] migrate: make core migration code aware of hugepage

On Mon 18-03-13 16:22:24, Michal Hocko wrote:
> On Thu 21-02-13 14:41:41, Naoya Horiguchi wrote:
> [...]
> > diff --git v3.8.orig/include/linux/mempolicy.h v3.8/include/linux/mempolicy.h
> > index 0d7df39..2e475b5 100644
> > --- v3.8.orig/include/linux/mempolicy.h
> > +++ v3.8/include/linux/mempolicy.h
> > @@ -173,7 +173,7 @@ extern int mpol_to_str(char *buffer, int maxlen, struct mempolicy *pol);
> >  /* Check if a vma is migratable */
> >  static inline int vma_migratable(struct vm_area_struct *vma)
> >  {
> > -	if (vma->vm_flags & (VM_IO | VM_HUGETLB | VM_PFNMAP))
> > +	if (vma->vm_flags & (VM_IO | VM_PFNMAP))
> >  		return 0;
> 
> Is this safe? At least check_*_range don't seem to be hugetlb aware.

Ohh, they become in 5/9. Should that one be reordered then?
-- 
Michal Hocko
SUSE Labs
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