linux-kernel - Re: [PATCH 1/8] mm: munlock use follow

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Date:	Tue, 8 Sep 2009 12:30:39 +0100 (BST)
From:	Hugh Dickins <hugh.dickins@...cali.co.uk>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hiroaki Wakabayashi <primulaelatior@...il.com>,
	Lee Schermerhorn <lee.schermerhorn@...com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Nick Piggin <npiggin@...e.de>, Rik van Riel <riel@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/8] mm: munlock use follow_page

On Tue, 8 Sep 2009, KAMEZAWA Hiroyuki wrote:
> On Mon, 7 Sep 2009 22:29:55 +0100 (BST)
> Hugh Dickins <hugh.dickins@...cali.co.uk> wrote:
> >  void munlock_vma_pages_range(struct vm_area_struct *vma,
> > -			   unsigned long start, unsigned long end)
> > +			     unsigned long start, unsigned long end)
> >  {
> > +	unsigned long addr;
> > +
> > +	lru_add_drain();
> >  	vma->vm_flags &= ~VM_LOCKED;
> > -	__mlock_vma_pages_range(vma, start, end, 0);
> > +
> > +	for (addr = start; addr < end; addr += PAGE_SIZE) {
> > +		struct page *page = follow_page(vma, addr, FOLL_GET);
> > +		if (page) {
> > +			lock_page(page);
> > +			if (page->mapping)
> > +				munlock_vma_page(page);
> 
> Could you add "please see __mlock_vma_pages_range() to see why" or some here ?

Why the test on page->mapping?
Right, I'll add some such comment on that.
Waiting a day or two to see what else comes up.

Thanks,
Hugh
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