linux-kernel - Re: 2.6.33 pagemap endless read loop

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Message-Id: <1263275999.5987.26.camel@marge.simson.net>
Date:	Tue, 12 Jan 2010 06:59:59 +0100
From:	Mike Galbraith <efault@....de>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 2.6.33 pagemap endless read loop

On Sun, 2010-01-10 at 13:37 +0100, Andi Kleen wrote:
> > Are you sure
> 
> I don't know if it's really endless, but it's doing a good emulation
> of it if it's not.
> 
> > 
> > On my 32bit machine, it runs for a long time, but finally exits.
> 
> That was on 64bit.
> 
> proc01 had accumulated several minutes of CPU time when I stopped it.
> 
> > From the document of pagemap, it is the mapping of all the virtual pages
> > of a process, on x86-32, it should be 4G/4K = 1024*1024 pages, also
> 
> Only the mapped ones surely?
> 
> Right now it looks like it dumps all the holes and that obviously
> will never finish on 64bit which has 47bits of address space.

Takes forever if you whack .pagemap_pte_hole too, just spends it's life
in pagemap_pte_range() instead.

start_vaddr:0x0 end_vaddr:0x7ffffffff000

Hm, zillion paces ain't a walk.

	-Mike

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