On Tue, Apr 28, 2015 at 11:53:21AM -0400, Chris Metcalf wrote: > The reason we use two 32-bit fields on tilepro is that the only available > atomic instruction is tns (test and set), which sets a 32-bit "1" value > into the target memory and returns the old 32-bit value.
And you want a ticket lock as opposed to the test-and-set lock because with 64 tiles starvation under contention is a real worry? Where sparc32 (which only has the load-store-unsigned-byte instruction, which is similar to your tns except it writes 0xff) has the benefit of not actually having many CPUs you get to do 64 cpus! -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
