On Fri, Apr 01, 2011 at 02:32:54AM -0400, Christoph Hellwig wrote: > On Fri, Apr 01, 2011 at 03:36:05PM +1100, Dave Chinner wrote: > > > If that's a concern, > > > can filesystem mark that bio (REQ_META?) and throttling logic can possibly > > > let these bio pass through. > > > > We already tag most metadata IO in this way. > > Actually we don't tag any I/O that way right now. That's mostly > because REQ_META assumes it's synchronous I/O and cfg and the block > layer give id additional priority, while in XFS metadata writes > are mostly asynchronous. We'll need a properly defined REQ_META > to use it, which currently is not the case. Oh, I misread the code in _xfs_buf_read that fiddles with _XBF_RUN_QUEUES. That flag is dead then, as is the XBF_LOG_BUFFER code which appears to have been superceded by the new XBF_ORDERED code. Definitely needs cleaning up. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx -- 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
