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

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Date:   Tue, 9 Nov 2021 09:42:18 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Christoph Hellwig <hch@...radead.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] f2fs: provide a way to attach HIPRI for Direct IO

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.

-- 
Jens Axboe