On Sat, 21 Feb 2015, Christoph Hellwig wrote: > On Thu, Feb 19, 2015 at 03:50:45PM -0800, Sage Weil wrote: > > - assemble the transaction > > - start any aio writes (we could use O_DIRECT here if the new hints > > include WONTNEED?) > > Note that kernel aio only is async if you specifiy O_DIRECT, otherwise > io_submit will simply block.
Ah, thanks. I guess in the buffered case though we won't block normally anyway (unless we've hit the bdi dirty threshold). So it's probably either aio direct or buffered write + aio fsync, depending on the cache hints? sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
