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SubjectRe: 5.14-rc breaks iotop swap io monitoring.
On Tue, Aug 24, 2021 at 10:31:16AM +0200, Peter Zijlstra wrote:
> On Mon, Aug 23, 2021 at 11:16:48PM -0400, Dave Jones wrote:
> > I just noticed that in 5.14-rc running iotop, it complains on startup
> > that "CONFIG_TASK_DELAY_ACCT not enabled in kernel, cannot determine
> > SWAPIN and IO %" and sure enough a bunch of columns show up as
> > 'unavailable'.
> >
> > My suspicion is this commit, which I've not confirmed yet as it doesn't
> > cleanly revert. I'll poke at it some more in the morning, but figured
> > I'd bring it up sans-evidence in the hope that I'll wake up to someone
> > having an Ah-ha moment.
>
> If you need DELAYACCT I'm thinking:
>
> e4042ad49235 ("delayacct: Default disabled")
>
> and
>
> 0cd7c741f01d ("delayacct: Add sysctl to enable at runtime")

That does sound more relevant. however, even after echo 1 > /proc/sys/kernel/task_delayacct,
it still fails in the same way.

Dave

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