Re: Uneccesary flushes waking up suspended disks

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On Fri, Mar 15, 2024 at 10:05:16AM -0400, Phillip Susi wrote:
> Dave Chinner <david@xxxxxxxxxxxxx> writes:
> > How do other filesystems behave? Is this a problem just on specific
> > filesystems?
> I finally got around to testing other filesystems and surprisingly, it
> seems this is only a problem for ext4.  I tried btrfs, f2fs, jfs, udf,
> and xfs.  xfs even uses the same jbd2 for journaling that ext4 does
> doesn't it?

No, xfs has its own logging code.

> I just formatted a clean fs, synced, and ran blktrace, then synced
> again, and only ext4 emits a flush on the second sync.

Heh.  Maybe we should deprecate ext4 then? :)

(Just kidding!)


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