Re: [Xen-devel] [patch 0/6] xenblk: Add O_DIRECT and O_SYNC support.

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 5/11/08 20:16, "Jens Axboe" <jens.axboe@xxxxxxxxxx> wrote:

>>> Does blkback propagate unplug events downwards?
>> 
>> Not sure what that means. blkback does its own limited queue plugging to try
>> to develop usefully schedulable batches of I/O. There's no concept of
>> plugging across the blkfront/blkback interface.
> 
> So once you leave your queuing loop, you unplug the below device? Or
> just point me at the source...

The tree's at http://xenbits.xensource.com/linux-2.6.18-xen.hg

You can clone it or browse it there.

The medium- to long-term issue is just to make sure that Jeremy's port of
blkback into upstream Linux (which he's probably working on at the moment)
doesn't perpetuate the bio violations. But I guess we should fix 2.6.18 too
since others base their own Xen patchsets on it still (e.g., for dom0
support).

 Thanks,
 Keir



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