On Tue, Feb 20, 2007 at 09:47:11AM +0100, Miklos Szeredi wrote: > > > How about this? > > > > > > Solves the FUSE deadlock, but not the throttle_vm_writeout() one. > > > I'll try to tackle that one as well. > > > > > > If the per-bdi dirty counter goes below 16, balance_dirty_pages() > > > returns. > > > > > > Does the constant need to tunable? If it's too large, then the global > > > threshold is more easily exceeded. If it's too small, then in a tight > > > situation progress will be slower. > > > > Ok, what is supposed to happen here is that filesystems are supposed to > > be throttled from making more dirty pages when the system is over the > > threshold. Even if filesystem A doesn't have much to contribute, and > > filesystem B is the cause of 99% of the dirty pages, the goal of the > > threshold is to prevent more dirty data from happening, and filesystem A > > should block. > > Which is the cause of the current deadlock. But if we allow > filesystem A to go into the red just a little, the deadlock is > avoided, because it can continue to make progress with cleaning the > dirtyness produced by B. > > The maximum that filesystems can go over the limit will be > > (16 + epsilon) * number-of-queues
Right, even for thousands of mounted filesystems ~16 pages per FS effectively pinned is not horrible. -chris - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/