NetBSD Problem Report #34586
From yamt@mwd.biglobe.ne.jp Fri Sep 22 14:46:06 2006
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Date: Fri, 22 Sep 2006 22:19:44 +0900 (JST)
From: yamt@mwd.biglobe.ne.jp
Reply-To: yamt@mwd.biglobe.ne.jp
To: gnats-bugs@NetBSD.org
Subject: amap can eat too much memory
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>Number: 34586
>Category: kern
>Synopsis: amap can eat too much memory
>Confidential: no
>Severity: serious
>Priority: medium
>Responsible: kern-bug-people
>State: open
>Class: sw-bug
>Submitter-Id: net
>Arrival-Date: Fri Sep 22 14:50:00 +0000 2006
>Last-Modified: Sun Oct 06 16:11:01 +0000 2019
>Originator: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
>Release: NetBSD 3.99.16
>Organization:
>Environment:
System: NetBSD bear.yamanet 3.99.16 NetBSD 3.99.16 (build.bear2) #34: Wed Mar 15 21:07:26 JST 2006 takashi@kaeru:/home/takashi/work/kernel/build.bear2 i386
Architecture: i386
Machine: i386
>Description:
for some workloads, amap eats unreasonable amount of memory.
>How-To-Repeat:
#include <stdio.h>
#include <unistd.h>
#define P 4096
#define X (2*1024*P)
int
main()
{
char *p = sbrk(0);
int i;
for (i = X; i += P * 16;) {
p += i;
brk(p);
p -= i - P;
brk(p);
}
}
>Fix:
implement amap shrinking?
>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: kern-bug-people->rmind
Responsible-Changed-By: rmind@NetBSD.org
Responsible-Changed-When: Fri, 27 Nov 2009 04:59:40 +0000
Responsible-Changed-Why:
Take, so I wont forget it. If somebody (i.e. yamt) wants to beat me on
fixing this - do not hesitate.
For the record: PR/33040 might be a duplicate of this problem.
Responsible-Changed-From-To: rmind->kern-bug-people
Responsible-Changed-By: rmind@NetBSD.org
Responsible-Changed-When: Sun, 06 Oct 2019 16:11:01 +0000
Responsible-Changed-Why:
>Unformatted:
(Contact us)
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