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Re: kern/54818: 9.0_RC1 pagedaemon spins
The following reply was made to PR kern/54818; it has been noted by GNATS.
From: Andrew Doran <ad%netbsd.org@localhost>
To: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
Cc: gnats-bugs%netbsd.org@localhost, martin%netbsd.org@localhost
Subject: Re: kern/54818: 9.0_RC1 pagedaemon spins
Date: Wed, 15 Jan 2020 14:41:17 +0000
On Wed, Jan 15, 2020 at 11:32:29PM +0900, Izumi Tsutsui wrote:
> ad@ wrote:
> > > I guess uvm/uvm_pdpolicy_clockpro.c part (empty uvmpdpol_scanfini())
> > > isn't necessary, right?
> > It's needed to make it compile, but it does not work on 9.0 or -current.
> Ah, I see for options PDPOLICY_CLOCKPRO case.
> > Thank you for the vmstat output, that was very helpful. I think it trying
> > to balance the queues but your other processes are competing with it, and
> > because of uvm_pageqlock nobody can make progress. This is not a problem on
> > -current any more because uvm_pageqlock is gone.. I have updated the patch
> > to try and help this situation. I have not compiled it because I don't have
> > a 9.0 system at the moment. Could you please try it again?
> > http://www.netbsd.org/~ad/2020/uvm-9.diff
> Thanks, but unfortunately it fails because this change includes
> "TAILQ_ENTRY(vm_page) pdqueue" not available in netbsd-9:
Oops. Updated patch is here:
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