On 12/02/2013 08:53 AM, Namhyung Kim wrote:
Sometimes users might want to see time information along with the performance result but the perf cannot provide it currently.In this patchset, I added such feature using sample->time. When the perf processes sample events, it calculate time info and update last timestamp. It keeps the last timestamp for each evsel (and for each cpu if it's a per-cpu session). It guesses whether a session is per-cpu if it found PERF_SAMPLE_CPU in a evsel->attr.sample_type since I couldn't find a better way. However it'll have a trouble if used with tracepoint events since they require the cpu info in the sample_type even for the per-thread sessions. The sample time will usually be proportional to the overhead but sometimes it show a different result especially in idle state. With this patch, perf report can show time information in the header (on --stdio output only for now) and a new column which can be enabled by --show-time-info option. $ perf record -- perf bench sched messaging $ perf report --stdio --show-time-info # Samples: 10K of event 'cycles' # Event count (approx.): 5168954556 # Total sampling time : 0.179102 (sec) <--- here # # Overhead Time Command Shared Object Symbol # ........ .......... ............... .................. ............................ # 6.59% 0.006093 sched-messaging [unknown] [.] 0x0000003153ebc7ed 4.81% 0.005354 sched-messaging [kernel.kallsyms] [k] copy_user_generic_string 3.89% 0.004098 sched-messaging [kernel.kallsyms] [k] avc_has_perm_flags 3.77% 0.003630 sched-messaging [kernel.kallsyms] [k] unix_stream_recvmsg 3.37% 0.003733 sched-messaging [kernel.kallsyms] [k] _raw_spin_lock 2.97% 0.003489 sched-messaging [kernel.kallsyms] [k] _raw_spin_lock_irqsave 2.73% 0.002615 sched-messaging [kernel.kallsyms] [k] __slab_free 2.56% 0.002392 sched-messaging [kernel.kallsyms] [k] page_fault 2.45% 0.002572 sched-messaging [kernel.kallsyms] [k] sock_alloc_send_pskb I put the series on 'perf/time-sample-v1' branch in my tree: git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git Any comments are welcome, thanks
Reviewed-by: Pekka Enberg <penb...@kernel.org> for the whole series. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
