linux-kernel - Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys

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Message-Id: <1201078278.6341.47.camel@lappy>
Date:	Wed, 23 Jan 2008 09:51:18 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Anton Salikhmetov <salikhmetov@...il.com>
Cc:	linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, valdis.kletnieks@...edu,
	riel@...hat.com, ksm@...dk, staubach@...hat.com,
	jesper.juhl@...il.com, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, protasnb@...il.com, miklos@...redi.hu,
	r.e.wolff@...wizard.nl, hidave.darkstar@...il.com,
	hch@...radead.org
Subject: Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in
	sys_msync()


On Wed, 2008-01-23 at 09:47 +0100, Peter Zijlstra wrote:
> On Wed, 2008-01-23 at 02:21 +0300, Anton Salikhmetov wrote:

> > +static void vma_wrprotect(struct vm_area_struct *vma)
> > +{
> > +	unsigned long addr = vma->vm_start;
> > +	pgd_t *pgd = pgd_offset(vma->vm_mm, addr);
> > +
> > +	while (addr < vma->vm_end) {
> > +		unsigned long next = pgd_addr_end(addr, vma->vm_end);
> > +
> > +		if (!pgd_none_or_clear_bad(pgd))
> > +			vma_wrprotect_pgd_range(vma, pgd, addr, next);
> > +
> > +		++pgd;
> > +		addr = next;
> > +	}
> > +}
> 
> I think you want to pass start, end here too, you might not need to
> sweep the whole vma.

Also, it still doesn't make sense to me why we'd not need to walk the
rmap, it is all the same file after all.

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