Re: [BUG] perf: No samples found when using kcore + coresight

James Clark
2023-03-28T09:00:22Z

On 28/03/2023 01:53, Yang Shi wrote:
> Hi Leo,
>
> Just follow up on this one. Any update?
>
Hi Yang,

Sorry no update on this yet from me. I was just finishing off
"coresight: Fix CTI module refcount leak by making it a helper device"
which I hope to post in the next day or two and then I will start on this.

James

> Thanks,
> Yang
>
> On Mon, Mar 13, 2023 at 5:36 PM Leo Yan <leo.yan@linaro.org> wrote:
>>
>> On Mon, Mar 13, 2023 at 11:15:44AM -0700, Yang Shi wrote:
>>
>> [...]
>>
>>>> Just a quick summary, here we have two issues:
>>>>
>>>> - With command:
>>>> perf record -e cs_etm/@tmc_etf63/k --kcore --per-thread \
>>>> -- taskset --cpu-list 1 uname",
>>>>
>>>> perf doesn't enable "text poke" attribution.
>>>
>>> No, it enables "text poke" and perf fails to decode coresight trace
>>> data too. It doesn't matter whether "--kcore" is after or before "-e
>>> cs/etm/@tmc_etf63/k".
>>
>> Understand now. Thanks for correction, if so we can ignore this one.
>>
>> Leo