WARNING: Kernel address maps (/proc/{kallsyms,m...

ryanel@ryane-virtual-machine:~/SDK/main$ perf record -N dd if=/dev/zero of=/dev/null count=10000000
WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,
check /proc/sys/kernel/kptr_restrict.


Samples in kernel functions may not be resolved if a suitable vmlinux
file is not found in the buildid cache or in the vmlinux path.


Samples in kernel modules won't be resolved at all.


If some relocation was applied (e.g. kexec) symbols may be misresolved
even with a suitable vmlinux or kallsyms file.


10000000+0 records in
10000000+0 records out
5120000000 bytes (5.1 GB) copied, 2.87822 s, 1.8 GB/s
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.120 MB perf.data (~5223 samples) ]