Performance testing and identifying performance bottlenecks

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Hi,
How can I profile and do some performance tests on the linux-omap kernel sources, and identify the 10 slowest methods for a specific subsystem, say DSS2?

I used to use IBM Rational Test-Real-Time before, to do these kinds of tests for embedded software, but don't have access to these expensive tools now, so I was wondering if some good open-source alternatives exists for doing this.

Best regards,

Elvis


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