From: Andi Kleen <[EMAIL PROTECTED]> Date: Wed, 14 Nov 2007 13:38:38 +0100
> At least for x86 and I suspect some 1other architectures we don't > initially need a syscall at all for this. There is an instruction > RDPMC who can read a performance counter just fine. It is also much > faster and generally preferable for the case where a process measures > events about itself. In fact it is essential for one of the use cases > I would like to see perfmon used (replacement of RDTSC for cycle > counting) I wouldn't even want to use a syscall for something like that on Sparc, I'd rather give this a dedicated software trap so that I can code it completely in assembler. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
