Date: Tue, 08 Jun 2021 00:39:55 -0700 From: Chris <bsd-lists@bsdforge.com> To: Dewayne Geraghty <dewayne@heuristicsystems.com.au> Cc: Dave Hayes <dave@jetcafe.org>, freebsd-stable@freebsd.org Subject: Re: Where might memory be reported? Message-ID: <7a70082c6e7e8f948e5c6f92c70174fc@bsdforge.com> In-Reply-To: <bba08248-f898-cead-8df5-a52b1e14257a@heuristicsystems.com.au> References: <20210606160913.167e6c0a@bigus.dream-tech.com> <20210607115334.6e9d1178@bigus.dream-tech.com> <6c174c830019d133fbb4daefe442fb40@bsdforge.com> <bba08248-f898-cead-8df5-a52b1e14257a@heuristicsystems.com.au>
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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.
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