On Thu, 2011-04-28 at 08:29 -0400, Chris Mason wrote: > Excerpts from Colin Ian King's message of 2011-04-28 07:36:30 -0400: > > One more data point to add, I've been looking at an identical issue when > > copying large amounts of data. I bisected this - and the lockups occur > > with commit > > 3e7d344970673c5334cf7b5bb27c8c0942b06126 - before that I don't see the > > issue. With this commit, my file copy test locks up after ~8-10 > > iterations, before this commit I can copy > 100 times and don't see the > > lockup. > > Well, that's really interesting. I tried with compaction on here and > couldn't trigger it, but this (very very lightly) tested patch might > help. > > It moves the writeout throttle before the goto restart, and also makes > sure we do at least one cond_resched before we loop. It seems to take longer, but with a PREEMPT kernel, kswapd eventually shoots up to 99% during the tar. James -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx 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>