On Wed, Jun 11, 2014 at 01:52:10PM +0400, Kirill Tkhai wrote: > > Currently migrate_tasks() skips throttled tasks, > because they are not pickable by pick_next_task(). > > These tasks stay on dead cpu even after they > becomes unthrottled. They are not schedulable > till user manually changes their affinity or till > cpu becomes alive again. > > But for user this looks completely untransparent: > task hangs, but it's not obvious what he has to do, > because kernel does not report any problem. > > This situation may easily be triggered intentionally. > Playing with extremely small cpu.cfs_quota_us causes > it almost in 100% cases. In usual life it's very rare, > but still possible for some unhappy user. >
How about fixing the unthrottle code to validate the affinity?
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