/usr/share/doc/libpapi5/README.Debian is in libpapi5 5.6.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | Accessing some CPU performance counters may require root permissions
or a reduced paranoia level in /proc/sys/kernel/perf_event_paranoid.
On hardened kernels any access by unprivileged users is forbidden by
default.
The paranoia level can be set by root with e.g.
# echo 2 > /proc/sys/kernel/perf_event_paranoid
perf event paranoia level (from kernel/events/core.c in src:linux):
-1 - not paranoid at all
0 - disallow raw tracepoint access for unpriv
1 - disallow cpu events for unpriv (Linux default)
2 - disallow kernel profiling for unpriv
3 - disallow all unpriv perf event use (Debian default)
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