Subject: Re: kern/15364
To: None <,,>
From: YAMAMOTO Takashi <>
List: netbsd-bugs
Date: 09/04/2005 09:48:02
The following reply was made to PR kern/15364; it has been noted by GNATS.

From: YAMAMOTO Takashi <>
Subject: Re: kern/15364
Date: Sun, 04 Sep 2005 18:47:15 +0900

 > On Wed, Aug 31, 2005 at 05:29:45AM +0900, YAMAMOTO Takashi wrote:
 > > > could you give some details on how the pagedaemon would be confused by this?
 > > 
 > > pagedaemon frees the whole block when one of the corresponding pages
 > > happens to be inactive.
 > could you explain how this happens?
 > here's the code that sets PG_RELEASE or PG_PAGEOUT on a page.
 > the marked lines skip setting those flags on pages in the cluster that
 > are outside the original request.  this should prevent the problem you're
 > describing, right?
 > -->                     if (tpg->offset < startoff || tpg->offset >= endoff)
 > -->                             continue;
 for normal filesystems, right.
 however, for softupdate, no.
 as ffs_putpages expands the request, the "original request" here
 is already expanded.
 i have seen a system on which uvmexp.pdfreed is larger
 than uvmexp.pdscans.