From: Anton Blanchard <anton@samba.org>
To: Chris Friesen <cfriesen@nortel.com>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: what is ~1MB of memory allocated at fffea000-fffff000 on ppc64?
Date: Mon, 27 Aug 2007 15:31:57 -0500 [thread overview]
Message-ID: <20070827203157.GD13612@kryten> (raw)
In-Reply-To: <46D3326C.3000505@nortel.com>
Hi,
> I've got a ppc64 box running 2.6.14. 64-bit kernel, 32-bit userspace.
> It has a ~86KB chunk of memory near the top of the process address
> space, and I'm not sure who's setting it up and what the purpose is. In
> /proc/<pid>/maps it looks like this:
>
> fffea000-fffff000 rw-p fffea000 00:00 0
>
> Can anyone enlighten me as to what this is for and who is allocating it?
Looks like your process stack. BTW we leave the top page
(0xfffff000 - 0xffffffff) unmapped mostly because of test cases that
expect
*(unsigned long *)-1UL
to fail.
Anton
next prev parent reply other threads:[~2007-08-27 20:31 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-27 20:22 what is ~1MB of memory allocated at fffea000-fffff000 on ppc64? Chris Friesen
2007-08-27 20:31 ` Anton Blanchard [this message]
2007-08-27 22:05 ` Chris Friesen
2007-08-27 23:19 ` Anton Blanchard
2007-08-28 5:19 ` Paul Mackerras
2007-08-28 15:15 ` Chris Friesen
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