diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-05-27 11:53:28 -0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2011-05-27 16:02:25 -0300 |
| commit | 5f6f55809758e106eca72c6e01402c8080a88ee8 (patch) | |
| tree | 23a21a57154fc589d4606a6ef1856cc1b38d93e2 | |
| parent | 59fb1ee95e74e8e0777289c44300cbe812aca836 (diff) | |
| download | lwn-5f6f55809758e106eca72c6e01402c8080a88ee8.tar.gz lwn-5f6f55809758e106eca72c6e01402c8080a88ee8.zip | |
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>
| -rw-r--r-- | tools/perf/builtin-top.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 375ed160d936..472f62790022 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -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 |