Hi Sean,
This seems reasonable. Perhaps add a couple of comments:
125 private float usedMemMax[]; // used when max pool size is undefined
202 if (totalMemory < 0) { // max is undefined for this pool
David
-----
On 4/06/2012 12:12 PM, Sean Chou wrote:
Hello,
Would any one like to take one more look ? It will help much !
---------- Forwarded message ----------
From: *Sean Chou* <zho...@linux.vnet.ibm.com
<mailto:zho...@linux.vnet.ibm.com>>
Date: Thu, May 31, 2012 at 3:17 PM
Subject: Request for review: 7173044: Memory monitor demo hangs if
MemoryUsage obj returns -1 in getMax
To: serviceability-dev@openjdk.java.net
<mailto:serviceability-dev@openjdk.java.net>
Hi all,
MemoryMonitor demo will hang if MemoryUsage obj returns -1
in getMax method.
The demo obtains totalMemory from getMax method, and it is used in
following loop:
" // .. Memory Free ..
big.setColor(mfColor);
int MemUsage = (int) (((totalMemory - usedMemory) / totalMemory) *
10);
int i = 0;
for ( ; i < MemUsage ; i++) {
mfRect.setRect(x1+5,(float) y1+ssH+i*blockHeight,
blockWidth, blockHeight-1);
big.fill(mfRect);
}
"
If -1 is returned, MemUsage becomes a very large positive value and
the loop hangs
the demo.
The bug is not seen in current openjdk because the beans returned
all has a Max
value returned. However, -1 is allowed by spec when Max is not set for
the bean, and
other jdk might return.
In the patch, max is set to 1m or the max memory usage in history
for the bean
if there is no max specified. Please take a look.
Bug: http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=7173044
Webrev: http://cr.openjdk.java.net/~zhouyx/7173044/webrev.01/ .
--
Best Regards,
Sean Chou
--
Best Regards,
Sean Chou
