Re: PATCH: Always use ll/sc for mips

["H. J. Lu" <hjl@lucon.org>]

On Tue, Jul 02, 2002 at 10:06:51PM +0200, Ralf Baechle wrote:
> On Tue, Jul 02, 2002 at 11:40:45AM -0700, H. J. Lu wrote:
> 
> > The ll/sc emulation is implemented in 2.4.0 and above. This patch makes
> > glibc always use ll/sc.
> 
> 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?


H.J.