On Thu, Oct 19, 2017 at 07:38:48AM -0400, Brian Foster wrote: > On Thu, Oct 19, 2017 at 09:47:05AM +0200, Christoph Hellwig wrote: > > Apparently our current rwsem code doesn't like doing the trylock, then > > lock for real scheme. So change our read/write methods to just do the > > trylock for the RWF_NOWAIT case. This fixes a ~25% regression in > > AIM7. > > > > The code looks fine, but this seems really strange. If the trylock > fails, then wouldn't the blocking lock have slept anyways if done > initially? Is there any more background info available on this, or > perhaps a theory on why there is such a significant regression..? No, unfortunately I don't have a theory, but I agree it is odd behavior in the rwsem code. -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
