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SubjectRe: [RFC 01/13] perf kwork: New tool
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Hello, Namhyung

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


Thanks,
Jihong
.

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