On Thu, 2011-05-12 at 14:44 -0500, James Bottomley wrote: > On Thu, 2011-05-12 at 13:37 -0500, James Bottomley wrote: > > On Thu, 2011-05-12 at 18:55 +0300, Pekka Enberg wrote: > > > On Thu, 2011-05-12 at 10:43 -0500, James Bottomley wrote: > > > > However, since you admit even you see problems, let's concentrate on > > > > fixing them rather than recriminations? > > > > > > Yes, please. So does dropping max_order to 1 help? > > > PAGE_ALLOC_COSTLY_ORDER is set to 3 in 2.6.39-rc7. > > > > Just booting with max_slab_order=1 (and none of the other patches > > applied) I can still get the machine to go into kswapd at 99%, so it > > doesn't seem to make much of a difference. > > > > Do you want me to try with the other two patches and max_slab_order=1? > > OK, so patches 1 + 2 plus setting slub_max_order=1 still manages to > trigger the problem (kswapd spinning at 99%). This is still with > PREEMPT; it's possible that non-PREEMPT might be better, so I'll try > patches 1+2+3 with PREEMPT just to see if the perturbation is caused by > it. Confirmed, I'm afraid ... I can trigger the problem with all three patches under PREEMPT. It's not a hang this time, it's just kswapd taking 100% system time on 1 CPU and it won't calm down after I unload the system. 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>