From: Olof Johansson <olof@lixom.net>
To: Will Schmidt <will_schmidt@vnet.ibm.com>
Cc: linuxppc-dev@ozlabs.org, Jon Tollefson <kniht@linux.vnet.ibm.com>,
Paul Mackerras <paulus@samba.org>
Subject: Re: [PATCH] Use 1TB segments
Date: Tue, 2 Oct 2007 21:11:05 -0500 [thread overview]
Message-ID: <20071003021105.GA6553@lixom.net> (raw)
In-Reply-To: <1191350274.18159.279.camel@farscape.rchland.ibm.com>
Hi,
On Tue, Oct 02, 2007 at 01:37:54PM -0500, Will Schmidt wrote:
> [RFC v2] 1TB Segment size support
>
> From: <>
>
> 1TB Segment size support
>
> This makes the kernel use 1TB segments for all kernel mappings and for
> user addresses of 1TB and above, on machines which support them
> (currently POWER5+ and POWER6).
PA6T supports them as well :)
> We don't currently use 1TB segments
> for user addresses < 1T, since that would effectively prevent 32-bit
> processes from using huge pages unless we also had a way to revert to
> using 256MB segments.
Wouldn't it be possible to stick with 1TB segments for the low range
for 64-bit processes as well, and have them allocate their hugepages
at >1TB?
-Olof
next prev parent reply other threads:[~2007-10-03 2:07 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-01 2:04 [PATCH] Use 1TB segments Paul Mackerras
2007-08-02 20:41 ` Will Schmidt
2007-08-02 22:37 ` Benjamin Herrenschmidt
2007-08-02 23:56 ` Will Schmidt
2007-08-03 2:53 ` David Gibson
2007-08-06 22:23 ` Jon Tollefson
2007-08-10 3:53 ` Michael Neuling
2007-10-02 18:37 ` Will Schmidt
2007-10-03 2:11 ` Olof Johansson [this message]
2007-10-03 3:07 ` Paul Mackerras
2007-10-03 3:27 ` Olof Johansson
2007-10-03 3:13 ` Paul Mackerras
2007-10-03 14:22 ` Will Schmidt
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