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f4f1c42953
Report possible permission error including kptr_restrict setting for map__load() failure. This can happen when non-superuser runs perf probe. With this patch, perf probe shows the following message. $ perf probe vfs_read Failed to load symbols from /proc/kallsyms Please ensure you can read the /proc/kallsyms symbol addresses. If the /proc/sys/kernel/kptr_restrict is '2', you can not read kernel symbol address even if you are a superuser. Please change it to '1'. If kptr_restrict is '1', the superuser can read the symbol addresses. In that case, please run this command again with sudo. Error: Failed to add events. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> Cc: Ian Rogers <irogers@google.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Link: http://lore.kernel.org/lkml/162282065877.448336.10047912688119745151.stgit@devnote2 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> |
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| arch | ||
| bootconfig | ||
| bpf | ||
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| cgroup | ||
| debugging | ||
| edid | ||
| firewire | ||
| firmware | ||
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| hv | ||
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| kvm/kvm_stat | ||
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| lib | ||
| memory-model | ||
| objtool | ||
| pci | ||
| pcmcia | ||
| perf | ||
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