On Tue, Mar 06, 2007 at 07:04:46PM +0100, Miklos Szeredi wrote: > From: Andrew Morton <akpm@xxxxxxxx> > > [tomoki.sekiyama.qu@xxxxxxxxxxx: bugfix] > > Miklos Szeredi <mszeredi@xxxxxxx>: > > Changes: > - updated to apply after clear_page_dirty_for_io() race fix > > This is needed for > > - balance_dirty_pages() deadlock fix > - fuse dirty page accounting > > I have no idea how serious the scalability problems with this are. If > they are serious, different solutions can probably be found for the > above, but this is certainly the simplest. Atomic operations to a single per-backing device from all CPUs at once? That's a pretty serious scalability issue and it will cause a major performance regression for XFS. I'd call this a showstopper right now - maybe you need to look at something like the ZVC code that Christoph Lameter wrote, perhaps? Cheers, Dave. -- Dave Chinner Principal Engineer SGI Australian Software Group - 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
