On Mon, Dec 08, 2008 at 03:07:24PM -0800, Andrew Morton wrote: > > Stupid question --- if you're worried about cacheline ping-pongs, why > > aren't each cpu's delta counter cacheline aligned? > > They are allocated with alloc_percpu(), so each CPU's counter lives > in a per-cpu area. If you chase through seventeen layers of Rustyness > you end up at mm/allocpercpu.c:percpu_populate() which is where that > little s32 ends up getting allocated. Ah, OK. So the answer is "Ted was stupid and didn't understand n layers of percpu abstractions".... whoever wrote that code seems to have been a great believer of the saying, "if the code was hard to *write*, it should be hard to *understand*". :-) - Ted -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
