From: Scott Wood <scottwood@freescale.com>
To: Kumar Gala <galak@kernel.crashing.org>
Cc: linuxppc-dev@ozlabs.org, Pantelis Antoniou <panto@intracom.gr>,
Paul Mackerras <paulus@samba.org>
Subject: Re: [RFC][PATCH] Move TASK_SIZE to 0xc0000000 for ppc32
Date: Mon, 08 Oct 2007 14:15:08 -0500 [thread overview]
Message-ID: <470A81BC.5020203@freescale.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0710081242280.10079@blarg.am.freescale.net>
Kumar Gala wrote:
> Guys,
>
> Here's a cut at a patch that cleans up the TASK_SIZE issue. We now have
> TASK_SIZE @ 0xc0000000 for everything except PREP and use PAGE_OFFSET in
> SW TLB handlers. I'm assuming 8xx will get a cleanup patch from
> PAGE_OFFSET testing (Dan :).
I'd rather this patch exclude 8xx along with PReP for now; the 8xx TLB
handlers could be made to accept arbitrary task sizes, but not without
slightly slowing them down (not that they're currently optimal -- IIUC,
using the hardware tablewalk assist is expensive due to serialization on
mtspr, and it doesn't really do anything that rlwimi can't do). I'm not
sure it's worth it -- does anyone really need more than 2GB userspace on
an 8xx?
At the very least, we should have the 8xx patch in place before turning
it on.
-Scott
prev parent reply other threads:[~2007-10-08 19:15 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-08 17:48 [RFC][PATCH] Move TASK_SIZE to 0xc0000000 for ppc32 Kumar Gala
2007-10-08 19:15 ` Scott Wood [this message]
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