Re: [PATCH 2/2] powerpc: implement arch_scale_smt_power for Power7

From: Joel Schopp
Date: Mon Jan 25 2010 - 12:51:15 EST

Benjamin Herrenschmidt wrote:
On Wed, 2010-01-20 at 16:09 -0600, Joel Schopp wrote:
I can turn that into a conditional branch (case statement) with a shift for the common 1,2,4 cases which should cover all procs available today falling back to a divide for any theoretical future processors that do other numbers of threads.

Look at the cputhreads.h implementation ... Today we only support
power-of-two numbers of threads.
I've run 3 threads using cpu hotplug to offline 1 of the 4. It's certainly a stupid idea, but there you go.
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at