My application was built using library libmtmalloc.so.1 in which "malloc" and
"free" is used for memory allocation and deallocation.
When I wanted to use DTrace ( I am using Solaris 10) to trace application's
memory usage, I could not get the address of the allocated memory in probe
"malloc:return".
Below is my D script:
----------------
#!/usr/sbin/dtrace -s
pid$1:libmtmalloc.so.1:malloc:entry
{
self->trace = 1;
self->size = arg0;
}
pid$1:libmtmalloc.so.1:malloc:return
/self->trace == 1/
{
printf("Ptr=0x%p Size=%d", arg1, self->size);
ustack();
self->trace = 0;
self->size = 0;
}
pid$1:libmtmalloc.so.1:free:entry
{
printf("Ptr=0x%p ", arg0);
ustack();
}
... ...
---------------------------
The output of the D script is as follows:
CPU ID FUNCTION:NAME
0 49823 malloc:return Ptr=0x1f4 Size=500
libmtmalloc.so.1`malloc+0x9c
a.out`0x10e7c
a.out`0x10e48
0 49826 free:entry Ptr=0xca068
libmtmalloc.so.1`free
a.out`0x10e98
a.out`0x10e48
So, I can't get the address allocated by malloc in proble "malloc:return". I
tried printing out our arguments, such as arg0, arg1 and arg2, none of them
looks like the address value. Actually in probe "malloc:return", arg1 equals
the size of the memory to be allocated ( 0x1f4 == 500 ), instead of the address
of the memory.
If I use malloc of libary libc.so.1, everything goes well.
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