On 04/30, Tejun Heo wrote: > > On 04/29/2010 11:16 PM, Rafael J. Wysocki wrote: > >>> Also, we already have one PM workqueue. It is used for runtime PM, but I guess > >>> it may be used just as well for the opportunistic suspend. It is freezable, > >>> but would it hurt? > >> > > Freezable workqueues have to be singlethread or else there will be unfixable > > races, so you can safely assume things will stay as they are in this respect. > > Rafael, can you elaborate a bit more on this? Just in case I missed > something while doing cmwq as it currently doesn't have such limit. Currently _cpu_down() can't flush and/or stop the frozen cwq->thread. IIRC this is fixable, but needs the nasty complications. We should thaw + stop the frozen cwq->thread, then move the pending works to another CPU. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
