Oct. 1, 2011
9:07 p.m.
Hello, I start to use perf to profile my program, but I'm not quite sure if I understand some events. First, perf can profile bus cycles. Is it the bus cycles of FSB? Second, what is task clock? It seems to me that task clock is the ticks used by a process. It should include the ticks used in the kernel mode and the user space mode, as long as it is used in the context of the process. I suppose it doesn't count the cycles used by the interrupts such as page faults and softirq, even though the irqs are caused by the process. Is it correct? Thanks, Da