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Date: Sun, 18 Jul 1999 12:21:56 -0700 (PDT)
From: peter@holm.cc
To: freebsd-gnats-submit@freebsd.org
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Subject: kern/12697: Out of swap handling [PATCH]
Sender: owner-freebsd-bugs@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org


>Number:         12697
>Category:       kern
>Synopsis:       Out of swap handling [PATCH]
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Jul 18 12:30:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Peter Holm
>Release:        Current
>Organization:
>Environment:
FreeBSD current.risby.dk 4.0-CURRENT FreeBSD 4.0-CURRENT #15: Sat Jul 17 11:55:26 CEST 1999     pho@current.risby.dk:/usr/src/current/src/sys/compile/PHO  i386
>Description:
I have tested out of swap handling in current. The situation is that
the system just lockes up, "looping" in vm_pageout_scan.

I have experimented with some modifications to vm_pageout.c that seems
to improve the chances for a recovery drastically.
All tests were done on my 128Mb RAM / 256 Mb swap box.

The changes consists of:
*       Killing all running user processes when less than 1024 pages
swap left.
*       Sleeping after each kill to allow the user process to run.
*       Pausing the  vmdaemon when in kill mode.

I have tried different strategies for when to stop killing but only this
one seems to guaranty recovery.


>How-To-Repeat:

>Fix:
begin 644 patch
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end

>Release-Note:
>Audit-Trail:
>Unformatted:


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