Re: [PATCH v3] perf: map pages in advance

David Hildenbrand
2024-12-20T09:56:56Z

On 20.12.24 10:31, Lorenzo Stoakes wrote:
> On Thu, Dec 19, 2024 at 01:17:44PM -0800, Chen, Zide wrote:
>
>> With this patch, it seems perf tool has some problems in capturing the
>> kernel data with Intel PT.
>>
>> Running the following commands, the size of perf.data is very small, and
>> perf script can't find any valid records.
>>
>> perf record -e intel_pt//u -- /bin/ls
>> perf script --insn-trace
>>
>>
>
> Hi,
>
> I'm on leave (and should really go back to relaxing :>), returning on 2nd
> Jan so can't really dig into this.
>
> But I tried it on my intel box and it 'works on my machine' with and
> without patch with commands provided, so I'm not sure this is actually a
> product of this change (which shouldn't impact this).

Zide Chen, can you try with and without this patch to see if it
introduces the issue?

--
Cheers,

David / dhildenb