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From: Ted Ts'o on 5 Aug 2010 12:20
On Thu, Aug 05, 2010 at 05:20:12AM +0300, Avi Kivity wrote:
>
> Why not? To be clear, I'm talking about an io_submit() with
> multiple IO_CMD_FSYNC requests, with a kernel implementation that is
> able to batch these requests.

IO_CMD_FSYNC doesn't exist right now, but sure, it means we don't have
to add a new syscall. I find the aio interface to be horribly
complicated, and it would mean that programs would have to link
against libaio, which again isn't my favorite set of interfaces.

All of that being said, I do agree that adding a new IO_CMD_FSYNC,
IO_CMD_FSYNCDATA, IO_CMD_FSYNC_NOBARRIER, and
IOCMD_FSYNC_DATA_NOBARRIER would be the simplist thing to do from a
kernel implementation perspective.

- Ted
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From: Ted Ts'o on 5 Aug 2010 16:40
On Thu, Aug 05, 2010 at 03:13:44PM -0400, Jeff Moyer wrote:
> > IO_CMD_FSYNC doesn't exist right now, but sure, it means we don't have
>
> Well, there's IOCB_CMD_FSYNC. But still, this isn't the same thing as
> what's requested. If I understand correctly, what is requested is a
> mechanism to flush out all data for multiple file descriptors and follow
> that with a single barrier/flush (and yes, Ted did give a summary of the
> commands that would be required to accomplish that).
>
> There still remains the question of why this should be tied to the AIO
> submission interface.

I don't think it should, personally. The only excuse might be if
someone wanted to do an asynchronous fsync(), but I don't think that
makes sense in most cases.

- Ted
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