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Re: [PATCH] Native POSIX Thread Library(NPTL) ARM Supporting Patches (1/3)
On Thu, May 29, 2003 at 03:28:35PM +0100, Philip Blundell wrote:
> On Thu, 2003-05-29 at 15:21, Jakub Jelinek wrote:
> > If ARMs are never going to be SMP, this seems like good idea
> > if there are no spare registers.
> Yep, there are indeed no spare registers.
> Right now, there are no SMP ARM systems. We might see some in the
> future, but there is always the option of locking down a line in the
> d-cache for use as CPU-local scratchpad memory. I guess if that's a
> possibility, it might be better for the kernel to pick the address of
> the thread ID variable.
I suspect that having the system call wouldn't be a total performance
killer; how many cycles is e.g. getuid() on ARM?
MontaVista Software Debian GNU/Linux Developer