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Re: PATCH: Always use ll/sc for mips
- From: "Maciej W. Rozycki" <macro at ds2 dot pg dot gda dot pl>
- To: "H. J. Lu" <hjl at lucon dot org>
- Cc: Ralf Baechle <ralf at oss dot sgi dot com>, linux-mips at oss dot sgi dot com, GNU C Library <libc-alpha at sources dot redhat dot com>
- Date: Thu, 4 Jul 2002 10:00:14 +0200 (MET DST)
- Subject: Re: PATCH: Always use ll/sc for mips
- Organization: Technical University of Gdansk
On Tue, 2 Jul 2002, H. J. Lu wrote:
> > Which means the overhead of two syscalls instead of one sysmips() call
> > for something that is assumed to be dirt cheap. R3000, R5900 etc.
> > users won't this patch you, which'll have significant impact on their
> > glibc performance.
>
> Not all ll/sc usages are implemented with sysmips. Does mips care about
> those? In case of libstdc++, should mips use ll/sc emulation?
Anything external to glibc should use _test_and_set() which is a
published interface.
--
+ Maciej W. Rozycki, Technical University of Gdansk, Poland +
+--------------------------------------------------------------+
+ e-mail: macro@ds2.pg.gda.pl, PGP key available +