On Tue, Aug 09, 2011 at 02:49:42PM +0100, Niels de Vos wrote: > > >>     = There is a new schedulear/timer patch from Lennert -- mystery > > >> minutes-long hangs should be gone for real now. > > > > > > Do you have any references like a git-commit or discussion on a > > > mailinglist for this? I'd like to match this with some other ARM > > > hardware (non/OLPC) issues I have seen. > > > > There's a description of our problem at: > > > > http://dev.laptop.org/git/olpc-kernel/commit/?h=arm-3.0&id=b8923ed080... > > Nice description! As it's mach-mmp dependent, it's unlikely that I can > apply this for mx51 based systems. The information in the git-commit is > clear and I'll try to investigate if 'sporadic hangs' could be caused > due to missing events. (Which sounds sane, as it might happen when > the system is under high load.) Looking at arch/arm/plat-mxc/time.c and its *_set_next_event() functions, it appears to correctly handle the case where the timeout has already expired, so it's not likely that mx51 is suffering from the same problem.