Re: [PATCH] use unlikely() for current_kernel_time() loop

[Andi Kleen]

> performance increased 2% per hyperthread; 

That would surprise me. Most likely you made some measurement error.

I guess it can be a difference if it's used in very hot loops, but then
i would expect a fallthrough path to win. Kernel code very rarely
has hot loops like this.

-Andi

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/