Re: trying to understand READ_META, READ_SYNC, WRITE_SYNC & co

From: Christoph Hellwig
Date: Sat Jun 26 2010 - 06:16:36 EST

On Sat, Jun 26, 2010 at 08:10:45PM +1000, Nick Piggin wrote:
> But I'm sure apps can submit fsyncs much faster than once per
> few ms, like small database transactions.

fsync / O_SYNC should be irrelevant for the idling logic. One those
retourn to the user data must have made it to the disk, and with our
barrier implementation that implies fully draining any outstanding I/O
on the device.
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