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perf top: Handle kptr_restrict

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2011-05-27 11:53:28 -03:00
parent 59fb1ee95e
commit 5f6f558097
1 changed files with 15 additions and 0 deletions
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15
tools/perf/builtin-top.c
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@ -80,6 +80,7 @@ static bool use_tui, use_stdio;
static int default_interval = 0;
static bool kptr_restrict_warned;
static bool inherit = false;
static int realtime_prio = 0;
static bool group = false;
@ -738,6 +739,20 @@ static void perf_event__process_sample(const union perf_event *event,
al.filtered)
return;
if (!kptr_restrict_warned &&
symbol_conf.kptr_restrict &&
al.cpumode == PERF_RECORD_MISC_KERNEL) {
ui__warning(
"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict.\n\n"
"Kernel%s samples will not be resolved.\n",
!RB_EMPTY_ROOT(&al.map->dso->symbols[MAP__FUNCTION]) ?
" modules" : "");
if (use_browser <= 0)
sleep(5);
kptr_restrict_warned = true;
}
if (al.sym == NULL) {
/*
* As we do lazy loading of symtabs we only will know if the