On Tue, Sep 15, 2015 at 05:26:22PM -0400, Tejun Heo wrote: > Hello, > > On Tue, Sep 15, 2015 at 11:11:45PM +0200, Christian Borntraeger wrote: > > > In fact, I would say that any userspace-controlled call to *_expedited() > > > is a bug waiting to happen and a bad idea---because userspace can, with > > > little effort, end up calling it in a loop. > > > > Right. This also implies that we should fix this for 4.2 - I guess. > > Are the percpu_rwsem changes enough? If so, we can try to backport > those. If those are too risky, we can revert the patches which > switched threadgroup lock to percpu_rwsem. I did take a shot at adding the rcu_sync stuff during this past merge window, but it did not converge quickly enough to make it. It looks quite good for the next merge window. There have been changes in most of the relevant areas, so probably best to just try them and see which works best. Thanx, Paul -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
