OProfile is a system-wide profiler for Linux systems, capable of profiling all running code at low overhead. OProfile is released under the GNU GPL.
It consists of a kernel driver and a daemon for collecting sample data, and several post-profiling tools for turning data into information.
OProfile leverages the hardware performance counters of the CPU to enable profiling of a wide variety of interesting statistics, which can also be used for basic time-spent profiling. All code is profiled: hardware and software interrupt handlers, kernel modules, the kernel, shared libraries, and applications.
OProfile is currently in alpha status; however it has proven stable over a large number of differing configurations; it is being used on machines ranging from laptops to 16-way NUMA-Q boxes. As always, there is no warranty.
Linux/MIPS support for Oprofile was added for Linux 2.6.10. There is no support for older MIPS kernels nor due to bugs and limitations in the existing oprofile patches for these kernels this is considered a sensible project.
CPUs support by the kernel
Oprofile support is available at the time of this writing only in the Sourceforge Oprofile CVS repository; released versions are either lacking support for MIPS or are unusable due to bugs. The following MIPS processors are supported by the CVS version of the userspace tools: