On 12/02/2009 11:55 PM, Christoph Lameter wrote: > On Wed, 2 Dec 2009, Tejun Heo wrote: > >> This isn't usual alignment. struct work_struct has one data fields >> which is overloaded for two purposes. Lower few bits are used to >> carry flags while upper bits are used to point to sruct >> cpu_workqueue_struct. So, the number of available bits for flags are >> determined by the alignment of cpu_workqueue_struct. Memory usage for > > The default mininum slab alignment in UP is 8 bytes which means you can > use 3 bits. And as far as I can see only the lower two bits are used. You > still have one bit leftover. (current upstream that is did not check if > you modified it). For colored workqueue flushing, it ends up using more than three bits. I haven't decided it fully yet but total of six or seven depending on how many colors are used. So, we need forced alignment anyway. Thanks. -- tejun -- To unsubscribe from this list: send the line "unsubscribe linux-next" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
