Re: [Lsf] IO less throttling and cgroup aware writeback (Was: Re: Preliminary Agenda and Activities for LSF)

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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code  which appears to have been superceded by the new XBF_ORDERED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
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