Kernel Log - Coming in 2.6.31 – Part 4: Tracing, architecture, virtualisation
Last weekend, Linus Torvalds released the seventh release candidate of Linux 2.6.31. In his release email, Torvalds highlights some of the corrections; two days earlier, the list of known new problems contained 29 unsolved problems.
Unlike the week before, Torvalds didn't make a statement about the final release of 2.6.31 – it is likely to take another week or two. The Kernel Log continues its discussion of the major new features of 2.6.31 by looking at the areas of tracing, architecture, memory management and virtualisation.
Detailed road test
Operating partly in the kernel and partly in the userspace, the "performance counters" code can be used for retrieving the performance data offered by modern processors. This performance data quantifies various CPU processes that have an impact on CPU performance – providing an in-depth analysis and allowing developers to optimise the code segments relevant to processing speed down to the last detail for each CPU.
Occasionally abbreviated to "perf_counter", performance counters should not be confused with Perfmon ("hardware-based performance monitoring interface for Linux"), which has offered similar functionality for years – the kernel hackers didn't include it in the Linux source code because they were dissatisfied with some of Perfmon's properties.
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