Solaris Application Programming, 1/e - Chapter 4 - Parent Directory

4.4 PROCESS- AND PROCESSOR-SPECIFIC TOOLS 83
Example 4.47 Number and Size of Calls to malloc by ls (continued )
256 |@@@@@ 2
512 | 0
1024 | 0
2048 | 0
4096 | 0
8192 | 0
16384 | 0
32768 |@@@ 1
65536 | 0
Once the sizes of the memory requests have been determined, it may also be
interesting to find out where the memory requests are being made. The script
shown in Example 4.48 captures the call stack for the calls to malloc.
Example 4.48 Capturing the User Call Stack for Calls to malloc
#!/usr/sbin/dtrace -s
pid$target:libc.so:malloc:entry
{
@stack[ustack(5)]=count();
@array[probefunc]=quantize(arg0);
}
END
{
printa(@stack);
printa(@array);
}
An example of running the script to capture the call stack of calls to malloc is
shown in Example 4.49.
Example 4.49 Call Stack for malloc Requests Made by the Compiler
# ./malloc_stack.d -c "cc -O an.c"
dtrace: script './malloc_stack.d' matched 2 probes
dtrace: pid 4063 has exited
CPU ID FUNCTION:NAME
6 2 :END
...
cc`malloc
libc.so.1`calloc+0x58
cc`stralloc+0x8
cc`str_newcopy+0xc
cc`addopt+0x88
154
continues