Messages in this thread | | | Date | Fri, 8 Nov 2019 12:00:09 +0100 | From | Jiri Olsa <> | Subject | Re: [PATCH v2] perf tool: Provide an option to print perf_event_open args and return value |
| |
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>
thanks, jirka
| |