forked from Minki/linux
perf top: Handle kptr_restrict
Reported-by: Ingo Molnar <mingo@elte.hu> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Tom Zanussi <tzanussi@gmail.com> Link: http://lkml.kernel.org/n/tip-cyl5zmi1nu35vyu7l5im2pyv@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -80,6 +80,7 @@ static bool use_tui, use_stdio;
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static int default_interval = 0;
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static bool kptr_restrict_warned;
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static bool inherit = false;
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static int realtime_prio = 0;
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static bool group = false;
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@ -738,6 +739,20 @@ static void perf_event__process_sample(const union perf_event *event,
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al.filtered)
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return;
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if (!kptr_restrict_warned &&
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symbol_conf.kptr_restrict &&
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al.cpumode == PERF_RECORD_MISC_KERNEL) {
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ui__warning(
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"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
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"Check /proc/sys/kernel/kptr_restrict.\n\n"
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"Kernel%s samples will not be resolved.\n",
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!RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
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" modules" : "");
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if (use_browser <= 0)
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sleep(5);
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kptr_restrict_warned = true;
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}
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if (al.sym == NULL) {
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/*
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* As we do lazy loading of symtabs we only will know if the
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