Hello, Michael. On Sat, Jan 02, 2016 at 11:36:03PM +0200, Michael S. Tsirkin wrote: > > Why so? As long as the maximum concurrently used workers are not > > high, 1/5 second or even a lot longer sleeps are completely fine. > > I always thought the right way to defer executing a work queue item > is to queue delayed work, not sleep + queue work.
That works too and is preferable if there are gonna be a lot of work items sleeping but it isn't different from any other blocking. > Doing a sleep ties up one thread for 1/5 of a second, does it not? It does. > If so, as long as it's the only driver doing this, we'll be fine, > but if many others copy this pattern, things will > start to break, will they not? The maximum concurrency on the system_wq is 256 which is pretty high, so for most use cases, it's fine. If high concurrency is expected, it's better to break it out to a separate workqueue. Thanks. -- tejun -- 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/
