linux-kernel - Re: [PATCH v2] perf tool: Provide an option to print perf_event

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Date:   Fri, 8 Nov 2019 12:00:09 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>
Cc:     acme@...nel.org, linux-kernel@...r.kernel.org
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@...ux.ibm.com>
> ---
> v1->v2:
>  - man page updates.

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka