perf/Documentation/perf-intel-pt.txt

70 code.  A fairly good kernel image is available in /proc/kcore but to get an
71 accurate image a copy of /proc/kcore needs to be made under the same conditions
72 as the data capture. 'perf record' can make a copy of /proc/kcore if the option
73 --kcore is used, but access to /proc/kcore is restricted e.g.
75 	sudo perf record -o pt_ls --kcore -e intel_pt// -- ls
78 simply 'data') and copies of /proc/kcore, /proc/kallsyms and /proc/modules into
1275 …hfs needs -o direct_io to enable reading of proc files.  root access is needed to read /proc/kcore.
1280 Copy the guest /proc/kallsyms, /proc/modules and /proc/kcore
1282  $ perf buildid-cache -v --kcore vm0/proc/kcore
1283 …kcore added to build-id cache directory /home/user/.debug/[kernel.kcore]/9600f316a53a0f54278885e8d…
1284 …$ KALLSYMS=/home/user/.debug/[kernel.kcore]/9600f316a53a0f54278885e8d9710538ec5f6a08/2021021807494…
1302 …$ sudo perf kvm --guest --host --guestkallsyms $KALLSYMS record --kcore -e intel_pt/tsc=0,mtc=0,cy…
1339 …hfs needs -o direct_io to enable reading of proc files.  root access is needed to read /proc/kcore.
1344 Copy the guest /proc/kallsyms, /proc/modules and /proc/kcore
1346  $ perf buildid-cache -v --kcore vm0/proc/kcore
1347 …same kcore found in /home/user/.debug/[kernel.kcore]/cc9c55a98c5e4ec0aeda69302554aabed5cd6491/2021…
1348 …$ KALLSYMS=/home/user/.debug/\[kernel.kcore\]/cc9c55a98c5e4ec0aeda69302554aabed5cd6491/20210213124…
1364 …$ sudo perf kvm --guest --host --guestkallsyms $KALLSYMS record --kcore -e intel_pt/cyc=1/k -p 169…
1458 …eband-testing-guest-perf.data --sample-identifier --buildid-all --switch-events --kcore -a -e dummy
1466  $ sudo perf record -o guest-sideband-testing-host-perf.data -m,64M --kcore -a -e intel_pt/cyc/
1620 …# perf record --kcore -e intel_pt/cyc/ -- tools/testing/selftests/kselftest_install/kvm/tsc_msrs_t…