On 5/10/13 1:58 PM, Chao Xu wrote:
Thanks David. This indeed gave more samples. Do you know why the symbol [k] 0xffffffff81043fea occured so often? As shown in the pasted result, both "swapper" and "perf" had this symbol. And if I "perf record dd if=/dev/zero of=/dev/null" or "perf record ping", they all showed this symbol. I pasted these results in the end of this email. I guess my real concern is the symbols cannot be mapped into meaningful function names. These symbols cannot be found in either /proc/kallsyms nor the vmlinux I built from the kernel source tree. Any idea? Thanks.
take a look at the output of report -v and report -D. For me those commands work just fine:
# perf record -a -- sleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 0.104 MB perf.data (~4527 samples) ] # perf report 38.39% swapper [kernel.kallsyms] [k] intel_idle 9.26% perf [kernel.kallsyms] [k] generic_exec_single 5.58% swapper [kernel.kallsyms] [k] cpuidle_wrap_enter 4.73% swapper [kernel.kallsyms] [k] hpet_legacy_next_event 4.47% swapper [kernel.kallsyms] [k] _raw_spin_lock_irqsave ... David -- To unsubscribe from this list: send the line "unsubscribe linux-perf-users" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
