Re: Where might memory be reported?

From: Chris <bsd-lists_at_bsdforge.com>
Date: Tue, 08 Jun 2021 00:39:55 -0700
On 2021-06-07 22:58, Dewayne Geraghty wrote:
> This issue was raised in April '21 by Andriy Gapon title "stable/13, vm
> page counts do not add up".
> 
> This was mentioned
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253281
> though its probably more of an affirmation of a symptom. (reminder to
> adjust status)
> 
> More relevant is
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234559
> where Mark Johnson advised (in Feb '19)
> "I've thought about this some more and decided to close this bug WONTFIX
> for now.  Basically, we started lazily dequeuing wired pages to avoid
> the page queue synchronization cost incurred by frequent wirings.  The
> result is that wired pages may temporarily be counted as
> active/inactive/laundry despite not being reclaimable.  Maintaining the
> previous behaviour wrt statistics would introduce synchronization
> overhead that we've been trying to avoid in past and future work.  I
> don't plan to change the current behaviour and there doesn't seem to be
> a compelling reason to do so, at least based on this report.  If you or
> anyone else would like to discuss this further or describe a use-case
> that depends on the old behaviour, please feel free to re-open the bug."
tl;dr
I recognize this needs work. But it's a GREAT DEAL of work, and I currently
have much shinier things on my to-do list. ;-)

No offense to Mark. He's doing a tremendous job. I just couldn't resist. :-)

--Chris
> 
> I hope I've shed some light on the current situation, unfortunately not
> in its resolution.
> Regards, Dewayne.
Received on Tue Jun 08 2021 - 07:39:55 UTC

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