Hi Satoru, Rik van Riel wrote: > KOSAKI Motohiro wrote: > > Richard Davies wrote: > > >Satoru Moriya wrote: > > > > > I have run into problems with heavy swapping with swappiness==0 and > > > > > was pointed to this thread ( > > > > > http://marc.info/?l=linux-mm&m=133522782307215 ) > > > > > > > > Did you test this patch with your workload? > > > > > > I haven't yet tested this patch. It takes a long time since these are > > > production machines, and the bug itself takes several weeks of > > > production use to really show up. > > > > > > Rik van Riel has pointed out a lot of VM tweaks that he put into 3.4: > > > http://marc.info/?l=linux-mm&m=133536506926326 > > > > > > My intention is to reboot half of our machines into plain 3.4 once it > > > is out, and half onto 3.4 + your patch. > > > > > > Then we can compare behaviour. > > > > > > Will your patch apply cleanly on 3.4? > > > > Note. This patch doesn't solve your issue. This patch mean, > > when occuring very few swap io, it change to 0. But you said > > you are seeing eager swap io. As Dave already pointed out, your > > machine have buffer head issue. > > > > So, this thread is pointless. > > Running KVM guests directly off block devices results in a lot > of buffer cache. > > I suspect that this patch will in fact fix Richard's issue. > > The patch is small, fairly simple and looks like it will fix > people's problems. It also makes swappiness=0 behave the way > most people seem to imagine it would work. > > If it works for a few people (test results), I believe we > might as well merge it. > > Yes, for cgroups we may need additional logic, but we can > sort that out as we go along. Now that 3.4 is out with Rik's fixes, I'm keen to start testing with and without this extra patch. Satoru - should I just apply your original patch (most likely), or do you need to update for the final released kernel? Thanks, Richard. -- 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>