> On Wed, May 14, 2008 at 11:40:28AM +0400, Evgeniy Polyakov (johnpol@xxxxxxxxxxx) wrote: > > > If any thread takes more than one kmap() at a time, it is deadlockable. > > > Because there is a finite pool of kmaps. Everyone can end up holding > > > one or more kmaps, then waiting for someone else to release one. > > > > It never takes the whole LAST_PKMAP maps. So the same can be applied to > > any user who kmaps at least one page - while user waits for free slot, > > it can be reused by someone else and so on. > > Actually CIFS uses the same logic: maps multiple pages in wrteback path > and release them after received reply. Yes. Only a pagevec at a time, though... apparently 14 is a small enough number not to bite too many people in practice? sage -- 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
