On 12/20/2024 1:56 AM, David Hildenbrand wrote: > 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? Yes, I re-did the test on a SPR server, and the result is same. Without the patch, it went well; But with it, "perf script --insn-trace" doesn't show valid records. This time I tested it on the clean 6.13-rc1 tag, base commit 40384c840ea1944d7c5a392e8975ed088ecf0b37 Also, with this patch, running tools/perf/tests/shell/test_intel_pt.sh: Error: The - data has no samples!
