Re: [RFC 01/13] perf kwork: New tool

[Yang Jihong]

Hello, Namhyung

On 2022/6/15 5:43, Namhyung Kim wrote:
> Hello,
>
> On Mon, Jun 13, 2022 at 2:48 AM Yang Jihong <yangjihong1@xxxxxxxxxx> 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.
OK, I'll fix in next version.


Thanks，
Jihong
.