How to find out what is using the native heap of a process running a JVM?

Hello,
I am not sure where to post this question so I am starting here.
I am troubleshooting a Java application using some native calls (32 bits Java running on Solaris 10). The size of the process (as reported by prstat) is slowly increasing day after day.
The size of the 'Java heap' is fixed at the start (-Xms and -Xmx are set to the same value on the command line when launching the Java app) and the GC is workling fine. No memory complaints from the Java side of the application.
It is the size of the 'native' heap (as reported by 'pmap') that is increasing:
root@mas01 # pmap 5382
5382:/apps/java/bin/java -server -Xms207M -Xmx207M -XX:MaxNewSize=24M -XX:N
00010000 64K r-x-- /apps/jdk1.5.0_19/bin/java
0002E000 16K rwx-- /apps/jdk1.5.0_19/bin/java
00032000 3896K rwx-- [ heap ]
00400000 389120K rwx-- [ heap ]
18000000 2784K rwx-- [ heap ]
DCAF4000 48K rw--R [ stack tid=169 ]
DCBF6000 40K rw--R [ stack tid=161 ]
DCCF8000 32K rw--R [ stack tid=160 ]
My first reaction was to search for a memory leak. Found a minor leak in the JVM with the ::findleak function (called within the mdb debugger). Upgraded to a later release of Java 5 (Java 1.5.0_19) where the leak is fixed but the heap is still increasing.
Many parts of the process allocate memory in the native heap. The JVM itself, the native calls made to a C++ library part of our Java application and maybe also some 3rd party software.
I would like to know what is the best way to find out what is consuming more and more memory in the native heap. I started looking a DTraces but I am new to this. I also thought maybe the Solaris Perftools might be of use but I never used them. Before plunging into a tool more or less blindly, I am asking for advices on how to tackle this issue. Can someone recommend a tool/method to see what is allocated in the heap?
Regards,
Stéphan
Edited by: StephanDupont on Sep 22, 2009 8:47 AM

After googling a lot I managed to run my application with libumem, generated a core file and succeeded to find some leak with mdb even if ::findleak reported nothing.
Does anyone knows if the ::findleak (you need libumem and mdb) is supposed to find leak in the native part of the memory and a Java application using the JNI interface?
Regards,
Stéphan

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