Hello, I'm tring to profile the system using perf, need help to under standard the output better.
I'm running perf from linux-tools-3.16 from debian testing. I use perf record -a -g -F 99 fio /dev/sdx to record a perf data, and perf report -g show: + 84.85% 0.11% swapper [kernel.kallsyms] [k] cpu_startup_entry + 84.17% 0.05% swapper [kernel.kallsyms] [k] arch_cpu_idle + 84.08% 0.06% swapper [kernel.kallsyms] [k] cpuidle_idle_call + 81.46% 0.00% swapper [kernel.kallsyms] [k] start_secondary + 75.25% 0.21% swapper [kernel.kallsyms] [k] cpuidle_enter_state + 66.33% 66.29% swapper [kernel.kallsyms] [k] acpi_idle_enter_simple + 9.60% 0.00% fio [kernel.kallsyms] [k] system_call_fastpath + 7.74% 0.05% fio libaio.so.1.0.1 [.] io_submit + 7.58% 0.00% fio [kernel.kallsyms] [k] sys_io_submit + 7.55% 0.05% fio [kernel.kallsyms] [k] do_io_submit + 7.38% 0.03% swapper [kernel.kallsyms] [k] irq_exit + 7.04% 0.02% fio [kernel.kallsyms] [k] blkdev_aio_read + 7.04% 0.15% swapper [kernel.kallsyms] [k] __do_softirq + 7.00% 0.03% fio [kernel.kallsyms] [k] generic_file_aio_read + 6.96% 0.01% fio [kernel.kallsyms] [k] blkdev_direct_IO + 6.73% 0.53% fio [kernel.kallsyms] [k] __blockdev_direct_IO + 6.09% 0.28% swapper [kernel.kallsyms] [k] call_function_single_interrupt + 5.90% 0.01% swapper [kernel.kallsyms] [k] acpi_idle_enter_c1 + 5.81% 0.01% swapper [kernel.kallsyms] [k] smp_call_function_single_interrupt + 5.38% 0.13% swapper [kernel.kallsyms] [k] scsi_softirq_done + 5.31% 0.02% swapper [kernel.kallsyms] [k] blk_done_softirq + 5.22% 0.04% swapper [kernel.kallsyms] [k] scsi_finish_command I know the first number is overhead percentage , but what's the second one? it's looks new to me, anyone could give me a hint? Thanks, Regards, Jack -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
