Messages in this thread | | | From | Arnaldo Carvalho de Melo <> | Date | Tue, 12 Nov 2019 08:29:10 -0300 | Subject | Re: [PATCH v2] perf tool: Provide an option to print perf_event_open args and return value |
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Em Fri, Nov 08, 2019 at 12:00:09PM +0100, Jiri Olsa escreveu: > On Fri, Nov 08, 2019 at 03:11:28PM +0530, Ravi Bangoria wrote: > > Perf record with verbose=2 already prints this information along with > > whole lot of other traces which requires lot of scrolling. Introduce > > an option to print only perf_event_open() arguments and return value. > > > > Sample o/p: > > $ ./perf --debug perf-event-open=1 record -- ls > /dev/null > > ------------------------------------------------------------ > > perf_event_attr: > > size 112 > > { sample_period, sample_freq } 4000 > > sample_type IP|TID|TIME|PERIOD > > read_format ID > > disabled 1 > > inherit 1 > > exclude_kernel 1 > > mmap 1 > > comm 1 > > freq 1 > > enable_on_exec 1 > > task 1 > > precise_ip 3 > > sample_id_all 1 > > exclude_guest 1 > > mmap2 1 > > comm_exec 1 > > ksymbol 1 > > bpf_event 1 > > ------------------------------------------------------------ > > sys_perf_event_open: pid 4308 cpu 0 group_fd -1 flags 0x8 = 4 > > sys_perf_event_open: pid 4308 cpu 1 group_fd -1 flags 0x8 = 5 > > sys_perf_event_open: pid 4308 cpu 2 group_fd -1 flags 0x8 = 6 > > sys_perf_event_open: pid 4308 cpu 3 group_fd -1 flags 0x8 = 8 > > sys_perf_event_open: pid 4308 cpu 4 group_fd -1 flags 0x8 = 9 > > sys_perf_event_open: pid 4308 cpu 5 group_fd -1 flags 0x8 = 10 > > sys_perf_event_open: pid 4308 cpu 6 group_fd -1 flags 0x8 = 11 > > sys_perf_event_open: pid 4308 cpu 7 group_fd -1 flags 0x8 = 12 > > ------------------------------------------------------------ > > perf_event_attr: > > type 1 > > size 112 > > config 0x9 > > watermark 1 > > sample_id_all 1 > > bpf_event 1 > > { wakeup_events, wakeup_watermark } 1 > > ------------------------------------------------------------ > > sys_perf_event_open: pid -1 cpu 0 group_fd -1 flags 0x8 > > sys_perf_event_open failed, error -13 > > [ perf record: Woken up 1 times to write data ] > > [ perf record: Captured and wrote 0.002 MB perf.data (9 samples) ] > > > > Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com> > > --- > > v1->v2: > > - man page updates. > > Acked-by: Jiri Olsa <jolsa@kernel.org>
[root@quaco ~]# perf test -v python 18: 'import perf' in python : --- start --- test child forked, pid 19237 Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: /tmp/build/perf/python/perf.so: undefined symbol: debug_peo_args test child finished with -1 ---- end ---- 'import perf' in python: FAILED! [root@quaco ~]#
Please always test your changes using 'perf test', before and after, to see if some regression is being added. I'm trying to fix this one.
Thanks,
- Arnaldo
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