> -----Original Message----- > From: penberg@xxxxxxxxx [mailto:penberg@xxxxxxxxx] On Behalf Of ext > Pekka Enberg > Sent: 05 June, 2012 11:02 > To: Minchan Kim ... > > Next concern is that periodic timer of implementation. > > I think it would add direct hook in vmscan.c rather than peeking raw > > vmstat periodically by timer so we can control more fine-grained way > without unnecessary overhead. > > If the hooks are clean and it doesn't hurt the !CONFIG_VMEVENT case, I'm > completely OK with that. On the previous iteration hooking vm was pointed as very bad idea, so in my version I installed shrinker to handle cases when we have memory pressure. Using deferred timer with adequate timeout (0.250 ms or larger) fully suitable for userspace and produce adequate overhead -> by nature such API should not be 100% accurate, anyhow applications cannot handle situation as good as kernel can provide, 0.5MB space accuracy, 100ms is maximum user-space require for 64-1024MB devices. -- 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