On Fri, 28 Sep 2007 15:52:28 -0400 Trond Myklebust <trond.myklebust@xxxxxxxxxx> wrote: > On Fri, 2007-09-28 at 12:26 -0700, Andrew Morton wrote: > > On Fri, 28 Sep 2007 15:16:11 -0400 Trond Myklebust <trond.myklebust@xxxxxxxxxx> wrote: > > > Looking back, they were getting caught up in > > > balance_dirty_pages_ratelimited() and friends. See the attached > > > example... > > > > that one is nfs-on-loopback, which is a special case, isn't it? > > I'm not sure that the hang that is illustrated here is so special. It is > an example of a bog-standard ext3 write, that ends up calling the NFS > client, which is hanging. The fact that it happens to be hanging on the > nfsd process is more or less irrelevant here: the same thing could > happen to any other process in the case where we have an NFS server that > is down. hm, so ext3 got stuck in nfs via __alloc_pages direct reclaim? We should be able to fix that by marking the backing device as write-congested. That'll have small race windows, but it should be a 99.9% fix? _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
