Date: Sun, 18 Jul 1999 12:21:56 -0700 (PDT) From: peter@holm.cc To: freebsd-gnats-submit@freebsd.org Subject: kern/12697: Out of swap handling [PATCH] Message-ID: <19990718192156.22B3714E50@hub.freebsd.org>
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>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
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