Messages in this thread | | | Subject | Re: [RFC/PATCHSET 0/6] perf tools: Support dynamic sort keys for tracepoints (v1) | From | David Ahern <> | Date | Mon, 14 Dec 2015 15:32:06 -0700 |
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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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