linux-kernel - Re: [PATCH -V9 04/15] hugetlb: use mmu_gather instead of a temporary linked list for accumulating pages

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Message-ID: <20120614071637.GB27397@tiehlicka.suse.cz>
Date:	Thu, 14 Jun 2012 09:16:37 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
Cc:	linux-mm@...ck.org, kamezawa.hiroyu@...fujitsu.com,
	dhillf@...il.com, rientjes@...gle.com, akpm@...ux-foundation.org,
	hannes@...xchg.org, linux-kernel@...r.kernel.org,
	cgroups@...r.kernel.org
Subject: Re: [PATCH -V9 04/15] hugetlb: use mmu_gather instead of a temporary
 linked list for accumulating pages

On Wed 13-06-12 22:07:06, Aneesh Kumar K.V wrote:
> Michal Hocko <mhocko@...e.cz> writes:
> 
> > On Wed 13-06-12 15:57:23, Aneesh Kumar K.V wrote:
> >> From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
> >> 
> >> Use a mmu_gather instead of a temporary linked list for accumulating
> >> pages when we unmap a hugepage range
> >
> > Sorry for coming up with the comment that late but you owe us an
> > explanation _why_ you are doing this.
> >
> > I assume that this fixes a real problem when we take i_mmap_mutex
> > already up in 
> > unmap_mapping_range
> >   mutex_lock(&mapping->i_mmap_mutex);
> >   unmap_mapping_range_tree | unmap_mapping_range_list 
> >     unmap_mapping_range_vma
> >       zap_page_range_single
> >         unmap_single_vma
> > 	  unmap_hugepage_range
> > 	    mutex_lock(&vma->vm_file->f_mapping->i_mmap_mutex);
> >
> > And that this should have been marked for stable as well (I haven't
> > checked when this has been introduced).
> 
> Switch to mmu_gather is to get rid of the use of page->lru so that i can use it for
> active list.

So can we get this to the changelog please?

-- 
Michal Hocko
SUSE Labs
SUSE LINUX s.r.o.
Lihovarska 1060/12
190 00 Praha 9    
Czech Republic
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