From: Paul Mackerras <paulus@samba.org>
To: Stefan Roese <sr@denx.de>
Cc: linuxppc-dev@ozlabs.org
Subject: Re: [PATCH] ppc: Add support for bigger page sizes than 4KB on PPC44x
Date: Fri, 16 Mar 2007 16:14:48 +1100 [thread overview]
Message-ID: <17914.10184.723915.920726@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <200703122254.27087.sr@denx.de>
Stefan Roese writes:
> This patch adds support for the PAGE_SIZE set equal to 64 KB on
> PPC32 platforms.
If I'm reading the patch right, with 64k pages you're using 8kB pgd
arrays and 256-byte pte arrays, so you're only using 1/256th of each
PTE page. In fact each PTE page could map 512MB (assuming 8 byte
ptes), and the pgd array could be a tiny 8-entry thing, which we could
kmalloc. I think that would use memory more efficiently.
Paul.
next prev parent reply other threads:[~2007-03-16 5:14 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-12 21:54 [PATCH] ppc: Add support for bigger page sizes than 4KB on PPC44x Stefan Roese
2007-03-13 4:56 ` Paul Mackerras
2007-03-13 5:10 ` David Gibson
2007-03-13 7:12 ` Benjamin Herrenschmidt
2007-03-13 7:37 ` Stefan Roese
2007-03-13 9:37 ` Wolfgang Denk
2007-03-13 13:54 ` Benjamin Herrenschmidt
2007-03-13 9:42 ` Christoph Hellwig
2007-03-13 9:54 ` David Gibson
2007-03-13 14:00 ` Grant Likely
2007-03-13 14:09 ` Josh Boyer
2007-03-16 5:14 ` Paul Mackerras [this message]
-- strict thread matches above, loose matches on Subject: below --
2007-03-16 13:34 Yuri Tikhonov
2007-03-16 22:34 ` Paul Mackerras
2007-03-17 11:41 ` Yuri Tikhonov
2007-03-21 10:43 ` Paul Mackerras
2007-03-21 11:23 ` Yuri Tikhonov
2007-04-25 17:37 ` Yuri Tikhonov
2007-03-16 13:35 Yuri Tikhonov
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