From: Jun Sun <jsun@mvista.com>
To: Teresa Tao <Teresat@tridentmicro.com>
Cc: linux-mips@linux-mips.org, jsun@mvista.com
Subject: Re: mmap'ed memory cacheable or uncheable
Date: Mon, 28 Jul 2003 14:24:01 -0700 [thread overview]
Message-ID: <20030728142401.K25784@mvista.com> (raw)
In-Reply-To: <61F6477DE6BED311B69F009027C3F58403AA396F@EXCHANGE>; from Teresat@tridentmicro.com on Fri, Jul 25, 2003 at 03:52:33PM -0700
On Fri, Jul 25, 2003 at 03:52:33PM -0700, Teresa Tao wrote:
> How about if I specify the following flags in my mmap routine just like what the pgprot_noncached micro did.
> pgprot_val(vma->vm_page_prot) &= ~_CACHE_MASK;
> pgprot_val(vma->vm_page_prot) |= _CACHE_UNCACHED;
>
> Will this have kernel make the mmap'd memory non-cacheable? Or is there a mmap non-cacheable patch?
>
I think this might work. Did you try it? The performance will be bad
though as mmap() is used widely by userland.
Jun
next prev parent reply other threads:[~2003-07-28 21:24 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-25 22:52 mmap'ed memory cacheable or uncheable Teresa Tao
2003-07-25 22:52 ` Teresa Tao
2003-07-28 21:24 ` Jun Sun [this message]
2003-07-29 16:09 ` Maciej W. Rozycki
-- strict thread matches above, loose matches on Subject: below --
2003-07-25 3:26 Teresa Tao
2003-07-25 3:26 ` Teresa Tao
2003-07-25 22:02 ` Jun Sun
2003-07-31 11:31 ` Ralf Baechle
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