From: Mike Galbraith <efault@gmx.de>
To: Andi Kleen <andi@firstfloor.org>
Cc: "Américo Wang" <xiyou.wangcong@gmail.com>, linux-kernel@vger.kernel.org
Subject: Re: 2.6.33 pagemap endless read loop
Date: Tue, 12 Jan 2010 06:59:59 +0100 [thread overview]
Message-ID: <1263275999.5987.26.camel@marge.simson.net> (raw)
In-Reply-To: <20100110123702.GC25323@basil.fritz.box>
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
next prev parent reply other threads:[~2010-01-12 6:00 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-10 2:09 Andi Kleen
2010-01-10 6:33 ` Américo Wang
2010-01-10 12:37 ` Andi Kleen
2010-01-12 5:59 ` Mike Galbraith [this message]
2010-01-12 15:32 ` Américo Wang
2010-01-12 16:28 ` Andi Kleen
2010-01-13 2:08 ` Américo Wang
[not found] ` <20100113141648.42eff724.akpm@linux-foundation.org>
[not found] ` <1263421562.29868.5000.camel@calx>
[not found] ` <20100113143055.7bea30c5.akpm@linux-foundation.org>
[not found] ` <1263423916.29868.5009.camel@calx>
[not found] ` <20100113151502.fa425247.akpm@linux-foundation.org>
[not found] ` <20100114055319.GA17671@localhost>
[not found] ` <20100113221013.b1beecb4.akpm@linux-foundation.org>
2010-01-14 8:06 ` Wu Fengguang
2010-01-14 8:30 ` Andi Kleen
2010-01-14 8:52 ` [PATCH] pagemap: early return on unmapped areas Wu Fengguang
2010-01-14 17:02 ` Matt Mackall
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