On Tue, Feb 10, 2015 at 10:29:36AM +0100, Peter Zijlstra wrote:
> On Tue, Feb 10, 2015 at 01:50:17PM +1100, NeilBrown wrote:
> > On Mon, 9 Feb 2015 10:10:00 +0100 Peter Zijlstra <pet...@infradead.org>
> > wrote:
> > > > However, when io_schedule() explicitly calls blk_flush_plug(), then
> > > > @from_schedule=false variant is used, and the unplug functions are
> > > > allowed to
> > > > allocate memory and block and maybe even call mempool_alloc() which
> > > > might
> > > > call io_schedule().
Note that as it stands recursively calling io_schedule() is already
broken. Things like delayacct_blkio_{start,end}() do not nest properly.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
