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perf top: Ignore kptr_restrict when not sampling the kernel 

If all events have attr.exclude_kernel set, no need to look at
kptr_restrict.

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-yegpzg5bf2im69g0tfizqaqz@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2017-11-14 13:30:19 -03:00
parent b0ebd811af
commit df7ccfa21e
1 changed files with 5 additions and 3 deletions
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2
tools/perf/builtin-top.c
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@ -732,6 +732,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
if (!machine->kptr_restrict_warned &&
symbol_conf.kptr_restrict &&
al.cpumode == PERF_RECORD_MISC_KERNEL) {
if (!perf_evlist__exclude_kernel(top->session->evlist)) {
ui__warning(
"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict.\n\n"
@ -740,6 +741,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
" modules" : "");
if (use_browser <= 0)
sleep(5);
}
machine->kptr_restrict_warned = true;
}