On Tue, 2013-01-08 at 23:23 +0000, Eric Wong wrote: > Mel Gorman <mgorman@xxxxxxx> wrote: > > Please try the following patch. However, even if it works the benefit of > > capture may be so marginal that partially reverting it and simplifying > > compaction.c is the better decision. > > I already got my VM stuck on this one. I had two twosleepy instances, > 2774 was the one that got stuck (also confirmed by watching top). > > Btw, have you been able to reproduce this on your end? > > I think the easiest reproduction on my 2-core VM is by running 2 > twosleepy processes and doing the following to dirty a lot of pages: Given the persistent sk_stream_wait_memory() traces I suspect a plain TCP bug, triggered by some extra wait somewhere. Please mm guys don't spend too much time right now, I'll try to reproduce the problem. Don't be confused by sk_stream_wait_memory() name. A thread is stuck here because TCP stack is failing to wake it. -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>