On Wed, Jan 30, 2008 at 11:19:28AM -0800, Christoph Lameter wrote: > On Wed, 30 Jan 2008, Jack Steiner wrote: > > > Moving to a different lock solves the problem. > > Well it gets us back to the issue why we removed the lock. As Robin said > before: If its global then we can have a huge number of tasks contending > for the lock on startup of a process with a large number of ranks. The > reason to go to mmap_sem was that it was placed in the mm_struct and so we > would just have a couple of contentions per mm_struct. > > I'll be looking for some other way to do this.
I think Andrea's original concept of the lock in the mmu_notifier_head structure was the best. I agree with him that it should be a spinlock instead of the rw_lock. Thanks, Robin -- 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/
