Re: kern/54818: 9.0_RC1 pagedaemon spins

[Havard Eidnes <he%uninett.no@localhost>]

The following reply was made to PR kern/54818; it has been noted by GNATS.

From: Havard Eidnes <he%uninett.no@localhost>
To: gnats-bugs%netbsd.org@localhost, mlelstv%serpens.de@localhost
Cc: ad%netbsd.org@localhost, tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: kern/54818: 9.0_RC1 pagedaemon spins
Date: Mon, 02 Mar 2020 15:34:00 +0100 (CET)

 >  > >  	http://www.netbsd.org/~ad/2020/uvm-9.diff
 >  >
 >  > I've manually applied this diff to my 8.1_RC1 src tree, and the
 >  > build succeeded.  Any predictions whether this has any chance of
 >  > improving the situation?
 >
 >  I'd say no. If there is (enough) free memory the pagedaemon should
 >  only be running if there is a kernel VA shortage and the diff doesn'=
 t
 >  influence that.
 
 Hm, I guess hat jives with Izumi's observations that the loop
 persists.
 
 However...  This leaves two questions which IMO needs validation:
 
 1) Is there "enough" free memory?
 2) Is there a kernel VA shortage?
 
 Is there any information I can collect to answer one or both of
 these?  Is just "vmstat -s" enough (only answers #1?), or is more
 needed?
 
 Regards,
 
 - H=E5vard