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Message-ID: <CAM9d7ch-VL6siA7g79pN1OSgus4X2C0D2tptAt5u04KUqxOUTg@mail.gmail.com>
Date: Tue, 14 Jun 2022 14:43:55 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Yang Jihong <yangjihong1@...wei.com>
Cc: Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-perf-users <linux-perf-users@...r.kernel.org>
Subject: Re: [RFC 01/13] perf kwork: New tool
Hello,
On Mon, Jun 13, 2022 at 2:48 AM Yang Jihong <yangjihong1@...wei.com> wrote:
>
> The perf-kwork tool is used to trace time properties of kernel work
> (such as irq, softirq, and workqueue), including runtime, latency,
> and timehist, using the infrastructure in the perf tools to allow
> tracing extra targets:
>
> # perf kwork -h
>
> Usage: perf kwork [<options>] {record|report|latency|timehist}
>
> -D, --dump-raw-trace dump raw trace in ASCII
> -f, --force don't complain, do it
> -k, --kwork <kwork> list of kwork to profile (irq, softirq, workqueue etc)
> -v, --verbose be more verbose (show symbol address, etc)
>
> # perf kwork record -- sleep 1
> [ perf record: Woken up 0 times to write data ]
> [ perf record: Captured and wrote 1.696 MB perf.data ]
>
> # perf kwork report -h
>
> Usage: perf kwork report [<options>]
>
> -C, --cpu <cpu> list of cpus to profile
> -i, --input <file> input file name
> -n, --name <name> event name to profile
> -s, --sort <key[,key2...]>
> sort by key(s): runtime, max, freq
> -S, --with-summary Show summary with statistics
> --time <str> Time span for analysis (start,stop)
>
> # perf kwork latency -h
>
> Usage: perf kwork latency [<options>]
>
> -C, --cpu <cpu> list of cpus to profile
> -i, --input <file> input file name
> -n, --name <name> event name to profile
> -s, --sort <key[,key2...]>
> sort by key(s): avg, max, freq
> --time <str> Time span for analysis (start,stop)
>
> # perf kwork timehist -h
>
> Usage: perf kwork timehist [<options>]
>
> -C, --cpu <cpu> list of cpus to profile
> -g, --call-graph Display call chains if present
> -i, --input <file> input file name
> -k, --vmlinux <file> vmlinux pathname
> -n, --name <name> event name to profile
> --kallsyms <file>
> kallsyms pathname
> --max-stack <n> Maximum number of functions to display backtrace.
> --symfs <directory>
> Look for files with symbols relative to this directory
> --time <str> Time span for analysis (start,stop)
I think you can add this and the documentation when you
actually add the functionality later.
Thanks,
Namhyung
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