On Mon, 25 April 2011 Linus Torvalds wrote: > On Mon, Apr 25, 2011 at 10:00 AM, Bruno PrÃmont 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. > > 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 from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
