On Mon, 8 Dec 2008 18:00:47 -0500 Theodore Tso <tytso@xxxxxxx> wrote: > On Mon, Dec 08, 2008 at 11:20:35PM +0100, Peter Zijlstra wrote: > > > > atomic_t is pretty good on all archs, but you get to keep the cacheline > > ping-pong. > > > > 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. -- 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
