If you’re looking for a profiler on linux, you ought to take a look at the recently updated Zoom project.

Zoom profiles are system-wide, precise down to the instruction level, and capture backtraces. This lets you see exactly where time was spent, what code was running, and how that code was called. Zoom allows you to drill down into critical code to get detailed performance answers. Zoom analyzes and annotates code with specific tuning advice for most compilers and processors. Zoom saves profiles as a single, self-contained session file that can be emailed or attached to bug reports. This lets you share what you find with colleagues or archive it for later review. Zoom also supports remote network profiling and scripting making it ideal for embedded or server systems and automated workflows.

Head over to the RotateRight website for the rest of the details.