From: Dave Airlie <airlied@gmail.com>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Christoph Hellwig <hch@lst.de>, Andrew Morton <akpm@osdl.org>,
linuxppc64-dev <linuxppc64-dev@ozlabs.org>,
Linus Torvalds <torvalds@osdl.org>,
Linux Kernel list <linux-kernel@vger.kernel.org>,
linux-mm@kvack.org
Subject: Re: [PATCH] ppc64: 64K pages support
Date: Sat, 5 Nov 2005 17:37:24 +1100 [thread overview]
Message-ID: <21d7e9970511042237p618d6306qb63272a4fa2263ea@mail.gmail.com> (raw)
In-Reply-To: <1131151488.29195.46.camel@gaston>
> What was the problem with drivers ? On ppc64, it's all hidden in the
> arch code. All the kernel sees is a 64k page size. I extended the PTE to
> contain tracking informations for the 16 sub pages (HPTE bits & hash
> slot index). Sub pages are faulted on demand and flushed all at once,
> but it's all transparent to the generic code.
>
We did that with the VAX port about 5 years ago :-), granted for
different reasons..
The VAX has 512 byte hw pages, we had to make a 4K pagesize for the
kernel by grouping 8 hw pages together and hiding it all in the arch
dir..
granted I don't know if it broke any drivers, we didn't have any...
Dave.
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prev parent reply other threads:[~2005-11-05 6:37 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1130915220.20136.14.camel@gaston>
[not found] ` <1130916198.20136.17.camel@gaston>
2005-11-05 0:38 ` Christoph Hellwig
2005-11-05 0:44 ` Benjamin Herrenschmidt
2005-11-05 6:37 ` Dave Airlie [this message]
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