linux-kernel - Re: [PATCH] f2fs: add sysfs entry to avoid FUA

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Message-ID: <YpGtDhV7V7gDk430@infradead.org>
Date:   Fri, 27 May 2022 22:03:10 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
Cc:     Eric Biggers <ebiggers@...nel.org>, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-block@...r.kernel.org, linux-xfs@...r.kernel.org
Subject: Re: [PATCH] f2fs: add sysfs entry to avoid FUA

On Fri, May 27, 2022 at 06:06:08PM -0700, Jaegeuk Kim wrote:
> I think there's still some benefit to use FUA such as small chunk writes
> for checkpoint.

Did you measure if there is?  Because some SSDs basically implemented
FUA as an implied flush after the write, in which case it would not
really help there either (but also not hurt).

But as the previous two maintainers already said - this needs quirking
at the driver layer, not in the submitter.