linux-kernel - [PATCHBOMB] time_stats, thread_with_file: lifting generic code to lib

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Date: Fri, 23 Feb 2024 17:00:17 -0800
From: "Darrick J. Wong" <djwong@...nel.org>
To: Kent Overstreet <kent.overstreet@...ux.dev>, daniel@...o.nz,
	akpm@...ux-foundation.org, keescook@...omium.org
Cc: linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs <linux-xfs@...r.kernel.org>
Subject: [PATCHBOMB] time_stats, thread_with_file: lifting generic code to lib

Hi all,

Kent and I went on a little sprint of figuring out if there were any
pieces of bcachefs that we could steal for XFS.  It turns out that there
are -- the timestats code is useful for measuring delays due to lock
contention, and thread_with_file will be very helpful for exporting
filesystem metadata health events to userspace.

So here's a pile of patchsets lifting those pieces of bcachefs to lib
and fixing a bunch of bugs in them.  These patches have already been
soaking in Kent's testing tree (and -next) for a few days, but
apparently not all of them got emailed so here I am blasting out the
entire thing.

If you want to see what XFS does with this, have a look at [1] and [2].
For 6.9 it'd be helpful to get these modules lifted.

--Darrick

[1] https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/log/?h=health-monitoring_2024-02-23
[2] https://git.kernel.org/pub/scm/linux/kernel/git/djwong/xfs-linux.git/tag/?h=contention-timestats_2024-02-23