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SubjectRe: [PATCH v4 1/3] perf report: Change sort order by a specified event in group
On Wed, Dec 18, 2019 at 10:24:41AM +0800, Jin Yao wrote:

SNIP

> After:
>
> # perf report --group --stdio --group-sort-idx 3
>
> # To display the perf.data header info, please use --header/--header-only options.
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 12K of events 'cpu/instructions,period=2000003/, cpu/cpu-cycles,period=200003/, BR_MISP_RETIRED.ALL_BRANCHES:pp, cpu/event=0xc0,umask=1,cmask=1,
> # Event count (approx.): 6451235635
> #
> # 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
> 0.00% 0.00% 0.00% 0.02% mgen [kernel.kallsyms] [k] scheduler_tick
>
> Now the output is sorted by the fourth event in group.
>
> v4:
> ---
> 1. Update Documentation/perf-report.txt to mention
> '--group-sort-idx' support multiple groups with different
> amount of events and it should be used on grouped events.
>
> 2. Update __hpp__group_sort_idx(), just return when the
> idx is out of limit.
>
> 3. Return failure on symbol_conf.group_sort_idx && !session->evlist->nr_groups.
> So now we don't need to use together with --group.

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

thanks,
jirka

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