On Mon, Apr 25, 2011 at 08:36:06PM +0200, Bruno Prémont wrote: > On Mon, 25 April 2011 Linus Torvalds wrote: > > On Mon, Apr 25, 2011 at 10:00 AM, Bruno Prémont wrote: > > > > > > I hope tiny-rcu is not that broken... as it would mean driving any > > > PREEMPT_NONE or PREEMPT_VOLUNTARY system out of memory when compiling > > > packages (and probably also just unpacking larger tarballs or running > > > things like du). > > > > I'm sure that TINYRCU can be fixed if it really is the problem. > > > > So I just want to make sure that we know what the root cause of your > > problem is. It's quite possible that it _is_ a real leak of filp or > > something, but before possibly wasting time trying to figure that out, > > let's see if your config is to blame. > > With changed config (PREEMPT=y, TREE_PREEMPT_RCU=y) I haven't reproduced > yet. > > When I was reproducing with TINYRCU things went normally for some time > until suddenly slabs stopped being freed. Hmmm... If the system is responsive during this time, could you please do the following after the slabs stop being freed? ps -eo pid,class,sched,rtprio,stat,state,sgi_p,cpu_time,cmd | grep '\[rcu' Thanx, Paul > > > And with system doing nothing (except monitoring itself) memory usage > > > goes increasing all the time until it starves (well it seems to keep > > > ~20M free, pushing processes it can to swap). Config is just being > > > make oldconfig from working 2.6.38 kernel (answering default for new > > > options) > > > > How sure are you that the system really is idle? Quite frankly, the > > constant growing doesn't really look idle to me. > > Except the SIGSTOPed build there is not much left, collectd running in > background (it polls /proc for process counts, fork rate, memory usage, > ... opening, reading, closing the files -- scanning every 10 seconds), > slabtop on one terminal. > > CPU activity was near-zero with 10%-20% spikes of system use every 10 > minutes and io-wait when all cache had been pushed out. > > > > Attached graph matching numbers of previous mail. (dropping caches was at > > > 17:55, system idle since then) > > > > Nothing at all going on in 'ps' during that time? And what does > > slabinfo say at that point now that kmemleak isn't dominating > > everything else? > > ps definitely does not show anything special, 30 or so userspace processes. > Didn't check ls /proc/*/fd though. Will do at next occurrence. > > > Going to test further with various PREEMPT and RCU selections. Will report > back as I progress (but won't have much time tomorrow). > > Bruno -- 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>