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SubjectRe: [PATCH v4 3/3] perf report: support hotkey to let user select any event for sorting
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On 12/18/2019 3:47 PM, Jiri Olsa wrote:
> On Wed, Dec 18, 2019 at 10:24:43AM +0800, Jin Yao wrote:
>> When performing "perf report --group", it shows the event group information
>> together. In previous patch, we have supported a new option "--group-sort-idx"
>> to sort the output by the event at the index n in event group.
>>
>> It would be nice if we can use a hotkey in browser to select a event
>> to sort.
>>
>> For example,
>>
>> # perf report --group
>>
>> Samples: 12K of events 'cpu/instructions,period=2000003/, cpu/cpu-cycles,period=200003/, ...
>> Overhead Command Shared Object Symbol
>> 92.19% 98.68% 0.00% 93.30% mgen mgen [.] LOOP1
>> 3.12% 0.29% 0.00% 0.16% gsd-color libglib-2.0.so.0.5600.4 [.] 0x0000000000049515
>> 1.56% 0.03% 0.00% 0.04% gsd-color libglib-2.0.so.0.5600.4 [.] 0x00000000000494b7
>> 1.56% 0.01% 0.00% 0.00% gsd-color libglib-2.0.so.0.5600.4 [.] 0x00000000000494ce
>> 1.56% 0.00% 0.00% 0.00% mgen [kernel.kallsyms] [k] task_tick_fair
>> 0.00% 0.15% 0.00% 0.04% perf [kernel.kallsyms] [k] smp_call_function_single
>> 0.00% 0.13% 0.00% 6.08% swapper [kernel.kallsyms] [k] intel_idle
>> 0.00% 0.03% 0.00% 0.00% gsd-color libglib-2.0.so.0.5600.4 [.] g_main_context_check
>> 0.00% 0.03% 0.00% 0.00% swapper [kernel.kallsyms] [k] apic_timer_interrupt
>> 0.00% 0.03% 0.00% 0.00% swapper [kernel.kallsyms] [k] check_preempt_curr
>>
>> When user press hotkey '3' (event index, starting from 0), it indicates
>> to sort output by the forth event in group.
>>
>> Samples: 12K of events 'cpu/instructions,period=2000003/, cpu/cpu-cycles,period=200003/, ...
>> Overhead Command Shared Object Symbol
>> 92.19% 98.68% 0.00% 93.30% mgen mgen [.] LOOP1
>> 0.00% 0.13% 0.00% 6.08% swapper [kernel.kallsyms] [k] intel_idle
>> 3.12% 0.29% 0.00% 0.16% gsd-color libglib-2.0.so.0.5600.4 [.] 0x0000000000049515
>> 0.00% 0.00% 0.00% 0.06% swapper [kernel.kallsyms] [k] hrtimer_start_range_ns
>> 1.56% 0.03% 0.00% 0.04% gsd-color libglib-2.0.so.0.5600.4 [.] 0x00000000000494b7
>> 0.00% 0.15% 0.00% 0.04% perf [kernel.kallsyms] [k] smp_call_function_single
>> 0.00% 0.00% 0.00% 0.02% mgen [kernel.kallsyms] [k] update_curr
>> 0.00% 0.00% 0.00% 0.02% mgen [kernel.kallsyms] [k] apic_timer_interrupt
>> 0.00% 0.00% 0.00% 0.02% mgen [kernel.kallsyms] [k] native_apic_msr_eoi_write
>> 0.00% 0.00% 0.00% 0.02% mgen [kernel.kallsyms] [k] __update_load_avg_se
>
> when I press 0...9 I'm getting extra columns:
>
> Samples: 134 of events 'anon group { cycles:u, instructions:u, cache-misses:u, cycles:u, instructions:u }', Event count (approx.): 7107344
> Overhead Command Shared Object Symbol Self
> 17.95% 41.20% 0.00% 12.44% 41.30% ls libc-2.29.so [.] __strcoll_l 17.95% 41.20% 0.00% 12.44% 41.30% N/A
> 0.00% 13.22% 0.00% 0.00% 0.00% ls ls [.] 0x000000000000871c 0.00% 13.22% 0.00% 0.00% 0.00% N/A
> 8.32% 11.49% 0.00% 2.62% 9.34% ls ld-2.29.so [.] do_lookup_x 8.32% 11.49% 0.00% 2.62% 9.34% N/A
> 0.00% 8.29% 31.18% 13.34% 3.05% ls ld-2.29.so [.] _dl_lookup_symbol_x 0.00% 8.29% 31.18% 13.34% 3.05% N/A
> 0.00% 6.47% 0.00% 0.00% 0.00% ls libc-2.29.so [.] __strlen_avx2 0.00% 6.47% 0.00% 0.00% 0.00% N/A
> 0.00% 5.97% 0.00% 0.00% 0.00% ls ls [.] 0x0000000000014001 0.00% 5.97% 0.00% 0.00% 0.00% N/A
> 5.77% 5.83% 7.79% 4.78% 5.04% ls ld-2.29.so [.] strcmp 5.77% 5.83% 7.79% 4.78% 5.04% N/A
> 2.31% 4.35% 8.30% 0.00% 0.00% ls ld-2.29.so [.] _dl_map_object_from_fd 2.31% 4.35% 8.30% 0.00% 0.00% N/A
> 0.00% 2.96% 0.00% 1.30% 2.22% ls ld-2.29.so [.] __GI___tunables_init 0.00% 2.96% 0.00% 1.30% 2.22% N/A
> 0.66% 0.22% 0.68% 0.00% 0.21% ls ld-2.29.so [.] _dl_start 0.66% 0.22% 0.68% 0.00% 0.21% N/A
> 2.42% 0.00% 0.02% 3.16% 0.00% ls [unknown] [k] 0xffffffffa2a012b0 2.42% 0.00% 0.02% 3.16% 0.00% N/A
> 0.16% 0.00% 0.01% 0.20% 0.00% ls ld-2.29.so [.] _start 0.16% 0.00% 0.01% 0.20% 0.00% N/A
> 0.00% 0.00% 11.47% 0.00% 0.00% ls libcap.so.2.26 [.] 0x0000000000002420 0.00% 0.00% 11.47% 0.00% 0.00% N/A
> 0.00% 0.00% 10.50% 0.00% 0.00% ls libc-2.29.so [.] __GI___tcgetattr 0.00% 0.00% 10.50% 0.00% 0.00% N/A
> 0.00% 0.00% 9.14% 0.00% 0.00% ls ls [.] 0x000000000000767a 0.00% 0.00% 9.14% 0.00% 0.00% N/A
> 13.60% 0.00% 7.14% 2.31% 0.00% ls ld-2.29.so [.] _dl_relocate_object 13.60% 0.00% 7.14% 2.31% 0.00% N/A
> 2.13% 0.00% 6.14% 0.00% 0.00% ls ld-2.29.so [.] _dl_map_object_deps 2.13% 0.00% 6.14% 0.00% 0.00% N/A
> 0.00% 0.00% 5.27% 0.00% 0.00% ls ld-2.29.so [.] strlen 0.00% 0.00% 5.27% 0.00% 0.00% N/A
> 1.31% 0.00% 2.37% 1.08% 0.00% ls ld-2.29.so [.] _dl_sysdep_start 1.31% 0.00% 2.37% 1.08% 0.00% N/A
>
>
> jirka
>

Looks it's an existing issue in perf. We can reproduce it by following
steps.

1. perf record -a -e cycles,instructions -- sleep 3
2. perf report --group
3. In browser, we use hotkey 's' to switch to another perf.data
4. Now in browser, the extra columns 'Self' and 'Children' will be shown.

But I have not figured out which patch caused this issue. :(

Thanks
Jin Yao

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