top(1) Laundry memory ?

pete wright nomadlogic at
Tue Nov 21 17:21:09 UTC 2017

On Tue, Nov 21, 2017 at 12:34 AM, Patrick Lamaiziere
<patfbsd at> wrote:
> Hi,
> In FreeBSD 11, there is something new in top(1) : laundry memory stats.
> Ex:
> Mem: 884M Active, 1330M Inact, 415M Laundry, 5175M Wired, 782M Buf, 84M
> Free
> Can someone explain what is this memory please ?
> man top:
>    Physical Memory Stats
>        Active:
>               number of bytes active
>        Inact: number of clean bytes inactive
>        Laundry:
>               number of dirty bytes queued for laundering

this is probably something that should be added to the FreeBSD memory
wiki and/or handbook.  My understanding of it comes from this thread:

"The PQ_LAUNDRY branch adds a new page queue, PQ_LAUNDRY, to store dirty
pages that have passed once through the inactive queue."

It also references this diff:

hope this helps!

pete wright

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