netbsd-bugs: kern/31275: mclpool hardlimit problem

Subject: kern/31275: mclpool hardlimit problem
To: None <kern-bug-people@netbsd.org, gnats-admin@netbsd.org,>
From: None <yamt@mwd.biglobe.ne.jp>
List: netbsd-bugs
Date: 09/09/2005 08:12:00

>Number:         31275
>Category:       kern
>Synopsis:       mclpool hardlimit problem
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Sep 09 08:12:00 +0000 2005
>Originator:     YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release:        NetBSD 3.99.8
>Organization:

>Environment:
	
	
System: NetBSD kaeru 3.99.8 NetBSD 3.99.8 (build.kaeru.xen.nodebug) #10: Thu Aug 25 20:00:08 JST 2005 takashi@kaeru:/home/takashi/work/kernel/build.kaeru.xen.nodebug i386
Architecture: i386
Machine: i386
>Description:
	mclpool assumes that there is always enough kva to allocate items
	up to hardlimit.
	after "kmapent" changes, it isn't likely true.
>How-To-Repeat:
>Fix:
	one of the followings?

	1. make PR_LIMITFAIL fail on kva starvation as well.
	2. adjust the size of the submap, considering overhead of kmapent.
	3. revive kmem_map-backed mapent pool.

>Unformatted: