• Arnaldo Carvalho de Melo's avatar
    perf record: Ignore kptr_restrict when not sampling the kernel · b0ebd811
    Arnaldo Carvalho de Melo authored
    If we're not sampling the kernel, we shouldn't care about kptr_restrict
    neither synthesize anything for assisting in resolving kernel samples,
    like the reference relocation symbol or kernel modules information.
    
    Before:
    
      $ cat /proc/sys/kernel/kptr_restrict /proc/sys/kernel/perf_event_paranoid
      2
      2
      $ perf record sleep 1
      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.
    
      Couldn't record kernel reference relocation symbol
      Symbol resolution may be skewed if relocation was used (e.g. kexec).
      Check /proc/kallsyms permission or run as root.
      [ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 0.001 MB perf.data (8 samples) ]
      $ perf evlist -v
      cycles:uppp: size: 112, { sample_period, sample_freq }: 4000, sample_type: IP|TID|TIME|PERIOD, disabled: 1, inherit: 1, exclude_kernel: 1, mmap: 1, comm: 1, freq: 1, enable_on_exec: 1, task: 1, precise_ip: 3, sample_id_all: 1, exclude_guest: 1, mmap2: 1, comm_exec: 1
      $
    
    After:
    
      $ perf record sleep 1
      [ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 0.001 MB perf.data (10 samples) ]
      $
    
    Cc: Adrian Hunter <adrian.hunter@intel.com>
    Cc: David Ahern <dsahern@gmail.com>
    Cc: Jiri Olsa <jolsa@kernel.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Wang Nan <wangnan0@huawei.com>
    Link: http://lkml.kernel.org/n/tip-t025e9zftbx2b8cq2w01g5e5@git.kernel.orgSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    b0ebd811
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