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SubjectRe: [RFC/PATCHSET 0/6] perf tools: Support dynamic sort keys for tracepoints (v1)
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On 12/14/15 10:47 AM, Arnaldo Carvalho de Melo wrote:
>> With dynamic sort keys, you can use <event.field> as a sort key. Those
>> dynamic keys are checked and created on demand. For instance, below is
>> to sort by next_pid field on the same data file.
>>
>> $ perf report -s comm,sched:sched_switch.next_pid --stdio
>> ...
>> # Overhead Command next_pid
>> # ........ ............... ..........
>> #
>> 21.23% transmission-gt 0
>> 20.86% swapper 17773
>> 6.62% netctl-auto 0
>> 5.25% swapper 109
>> 5.21% kworker/0:1H 0
>> 1.98% Xephyr 0
>> 1.98% swapper 6524
>> 1.98% swapper 27478
>> 1.37% swapper 27476
>> 1.17% swapper 233
>>
>> Multiple dynamic sort keys are also supported:
>>
>> $ perf report -s comm,sched:sched_switch.next_pid,sched:sched_switch.next_comm --stdio
>> ...
>> # Overhead Command next_pid next_comm
>> # ........ ............... .......... ................
>> #
>> 20.86% swapper 17773 transmission-gt
>> 9.64% transmission-gt 0 swapper/0
>> 9.16% transmission-gt 0 swapper/2
>> 5.25% swapper 109 kworker/0:1H
>> 5.21% kworker/0:1H 0 swapper/0
>> 2.14% netctl-auto 0 swapper/2
>> 1.98% netctl-auto 0 swapper/0
>> 1.98% swapper 6524 Xephyr
>> 1.98% swapper 27478 netctl-auto
>> 1.78% transmission-gt 0 swapper/3
>> 1.53% Xephyr 0 swapper/0
>> 1.29% netctl-auto 0 swapper/1
>> 1.29% swapper 27476 netctl-auto
>> 1.21% netctl-auto 0 swapper/3
>> 1.17% swapper 233 irq/33-iwlwifi
>>
>> Note that pid 0 exists for each cpu so have comm of 'swapper/N'.
>
>> This is available on 'perf/dynamic-sort-v1' branch in my tree
>>
>> git://git.kernel.org/pub/scm/linux/kernel/git/namhyung/linux-perf.git
>>
>> Any comments are welcome, thanks!
>> Namhyung
>
> I'll look at the patches for style, but the idea is so nice and natural
> I thought about blind merging it :-)
>

yes, that is a cool feature.

For scheduling tracepoints the analysis could be added to perf-sched to
ease the burden of the command line syntax.




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