On Tue, Mar 27, 2012 at 01:03:09PM -0400, Christoph Hellwig wrote:
> On Tue, Mar 27, 2012 at 12:19:41PM -0400, Vivek Goyal wrote:
> > So xfs either need to resort to similar optimizaiton where IO type from
> > both the process context is of same type or try to do all the IO from
> > one process context.
>
> All XFS log I/O is marked SYNC and (FUA and/or FLUSH).
Well, if all the requests are marked with FUA/FLUSH, then I think these
requests will not even be given to IO scheduler. And we should not have
the issue of idling.
if (bio->bi_rw & (REQ_FLUSH | REQ_FUA)) {
spin_lock_irq(q->queue_lock);
where = ELEVATOR_INSERT_FLUSH;
goto get_rq;
}
Thanks
Vivek
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