> Not good enough, I'm afraid. It looks like Ben's right and you need > a count - and counts in the page struct are a lot harder to add than > page flags. > > I've now played around with the hangs on my three 4CPU machines > (all of them in io_schedule below __lock_page, waiting on pages > which were neither PG_locked nor PG_waiters when I looked). > > Seeing Ben's mail, I thought the answer would be just to remove > the "_exclusive" from your three prepare_to_wait_exclusive()s. > That helped, but it didn't eliminate the hangs.
There might be a way ... by having the flags manipulation always atomically deal with PG_locked and PG_waiters together. This is possible but we would need even more weirdo bitops abstractions from the arch I'm afraid... unless we start using atomic_* rather that bitops in order to manipulate multiple bits at a time. Ben. - 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/
