Em Fri, May 18, 2012 at 09:48:26AM +0400, Dmitry Antipov escreveu:
On 05/17/2012 03:48 PM, Steven Rostedt wrote:
trace-cmd copies the entire /sys/kernel/debug/tracing/events directory into the data file (well it copies only the events you specify). I thought perf did the same. It should be using what's in the perf.dat file and not what's on the host.
I found that 'perf script' and 'perf report' works differently, and I suppose 'perf script' is correct and 'perf report' isn't.
What I'm doing on PC host is:
I haven't tested this, but libtraceevent is now in, perhaps it works for you now? Can you check?
- Arnaldo
Collect data with: perf record -a -R -f -m 8192 -c 1 -e sched:sched_switch \ -e sched:sched_process_exit -e sched:sched_process_fork \ -e sched:sched_wakeup -e sched:sched_migrate_task [task]
Collect an output from 'perf script' and 'perf report', both looks great.
Copy perf.data and contents of /proc/kallsyms to ARM target.
Next, on ARM target: perf script --kallsyms=[kallsyms from PC host] -i [perf.data from PC host] Looks good, all event names like 'sched_wakeup' or 'sched_switch' are shown.
Try: perf report --kallsyms=[kallsyms from PC host] -i [perf.data from PC host] --stdio All event names are shown as 'unknown:unknown'.
"Cross-replaying" (perf sched replay) looks broken too. Host results are:
run measurement overhead: 260 nsecs sleep measurement overhead: 56109 nsecs the run test took 1000054 nsecs the sleep test took 1076170 nsecs nr_run_events: 246 nr_sleep_events: 257 nr_wakeup_events: 123 target-less wakeups: 27 task 0 ( <unknown>: 3440), nr_events: 33 task 1 ( kworker/0:0: 3227), nr_events: 15 task 2 ( <unknown>: 0), nr_events: 125 task 3 ( plugin-containe: 1769), nr_events: 13 task 4 ( ksoftirqd/0: 3), nr_events: 5 task 5 ( kworker/2:2: 2023), nr_events: 3 task 6 ( perf: 3441), nr_events: 200 task 7 ( migration/2: 3091), nr_events: 3 task 8 ( kworker/1:0: 3104), nr_events: 158 task 9 ( urxvt: 2952), nr_events: 95 task 10 ( ksoftirqd/2: 3093), nr_events: 3
#1 : 70.193, ravg: 70.19, cpu: 116.57 / 116.57 #2 : 70.607, ravg: 70.23, cpu: 116.61 / 116.58 #3 : 70.411, ravg: 70.25, cpu: 116.69 / 116.59 #4 : 70.386, ravg: 70.27, cpu: 116.72 / 116.60 #5 : 70.222, ravg: 70.26, cpu: 116.39 / 116.58 #6 : 70.361, ravg: 70.27, cpu: 116.40 / 116.56 #7 : 70.409, ravg: 70.28, cpu: 116.43 / 116.55 #8 : 70.368, ravg: 70.29, cpu: 116.50 / 116.55 #9 : 70.604, ravg: 70.32, cpu: 116.75 / 116.57 #10 : 70.578, ravg: 70.35, cpu: 116.79 / 116.59
Cross-replaying attempt is ('perf sched -i [perf.data from PC host] replay'):
run measurement overhead: 8099 nsecs sleep measurement overhead: 159428 nsecs the run test took 998913 nsecs the sleep test took 1188048 nsecs nr_run_events: 0 nr_sleep_events: 0 nr_wakeup_events: 0
#1 : 0.058, ravg: 0.06, cpu: 0.00 / 0.00 #2 : 0.105, ravg: 0.06, cpu: 0.00 / 0.00 #3 : 0.027, ravg: 0.06, cpu: 0.00 / 0.00 #4 : 0.026, ravg: 0.06, cpu: 0.00 / 0.00 #5 : 0.035, ravg: 0.05, cpu: 0.00 / 0.00 #6 : 0.027, ravg: 0.05, cpu: 0.00 / 0.00 #7 : 0.027, ravg: 0.05, cpu: 0.00 / 0.00 #8 : 0.028, ravg: 0.05, cpu: 0.00 / 0.00 #9 : 0.029, ravg: 0.04, cpu: 0.00 / 0.00 #10 : 0.028, ravg: 0.04, cpu: 0.00 / 0.00
Dmitry