Re: [PATCH] f2fs: provide a way to attach HIPRI for Direct IO

[Jaegeuk Kim]

On 11/09, Jens Axboe wrote:
> On 11/9/21 9:39 AM, Christoph Hellwig wrote:
> > On Mon, Nov 08, 2021 at 06:13:36PM -0800, Jaegeuk Kim wrote:
> >> This patch adds a way to attach HIPRI by expanding the existing sysfs's
> >> data_io_flag. User can measure IO performance by enabling it.
> > 
> > NAK.  This flag should only be used when explicitly specified by
> > the submitter of the I/O.
> 
> Yes, this cannot be set in the middle for a multitude of reasons. I wonder
> if we should add a comment to that effect near the definition of it.

Not surprising. I was wondering we can add this for testing purpose only.
Btw, is there a reasonable way that filesystem can use IO polling?

> 
> -- 
> Jens Axboe