On Tue, Apr 17, 2012 at 02:48:31PM -0700, Tejun Heo wrote: [..] > As for priority inversion through shared request pool, it is a problem > which needs to be solved regardless of how async IOs are throttled. > I'm not determined to which extent yet tho. Different cgroups > definitely need to be on separate pools but do we also want > distinguish sync and async and what about ioprio? Maybe we need a > bybrid approach with larger common pool and reserved ones for each > class? currently we have global pool with separate limits for sync and async and there is no consideration of ioprio. I think to keep it simple we can just extend the same notion to keep per cgroup pool with internal limits on sync/async requests to make sure sync IO does not get serialized behind async IO. Personally I am not too worried about async IO prio. It has never worked. Thanks Vivek -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>