From: Randolph Chung <randolph@tausq.org>
To: Grant Grundler <grundler@parisc-linux.org>
Cc: parisc-linux@lists.parisc-linux.org,
Kyle McMartin <kyle@parisc-linux.org>
Subject: Re: [parisc-linux] alternate insn for parisc (ccio/sba)
Date: Sat, 04 Mar 2006 11:21:41 +0800 [thread overview]
Message-ID: <440907C5.7050503@tausq.org> (raw)
In-Reply-To: <20060304003802.GB18473@colo.lackof.org>
> Anyplace we use asm that could be different for PA20 vs PA11.
> __ffs() in include/asm/bitops.h probaby isn't the best example
> but it might be good enough to give an idea.
> Ie kernel built for PA11 could be optimized for PA20-32bit.
Just my 2 cents, but unless it is code that is performance critical and
we can demonstrate a significant difference on a particular measurement,
and it is not something that can be determined at compile time, I think
we should do runtime code patching sparingly. If nothing else, it makes
the code harder to read and perhaps to debug.
>> Also, if you want to test it, you'll need to remove the & ~_PAGE_WRITE from
>> PAGE_KERNEL_RO in asm/pgtable.h until we write protect the kernel at a
>> later stage.
Right - it seems we should re-map the kernel read-only after you patch
the insns.
> very cool! ++kyle. :)
it is cool, thanks for working on this, Kyle.
randolph
--
Randolph Chung
Debian GNU/Linux Developer, hppa/ia64 ports
http://www.tausq.org/
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next prev parent reply other threads:[~2006-03-04 3:21 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-03 20:14 [parisc-linux] alternate insn for parisc (ccio/sba) Kyle McMartin
2006-03-04 0:38 ` Grant Grundler
2006-03-04 0:35 ` Kyle McMartin
2006-03-04 3:21 ` Randolph Chung [this message]
2006-03-06 17:07 ` Grant Grundler
2006-03-06 16:05 ` Kyle McMartin
2006-03-06 17:20 ` Grant Grundler
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