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perf tools: Warn that perf_event_paranoid can restrict kernel symbols 

Warn that /proc/sys/kernel/perf_event_paranoid can also restrict kernel
symbols.

Signed-off-by: Igor Lubashev <ilubashe@akamai.com>
Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Link: http://lkml.kernel.org/r/1566869956-7154-6-git-send-email-ilubashe@akamai.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Igor Lubashev 2019-08-26 21:39:16 -04:00 committed by Arnaldo Carvalho de Melo
parent 8859aedefe
commit d06e5fad8c
3 changed files with 3 additions and 3 deletions
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2
tools/perf/builtin-record.c
View File

@ -2372,7 +2372,7 @@ int cmd_record(int argc, const char **argv)
if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(rec->evlist)) if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(rec->evlist))
pr_warning( pr_warning(
"WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n" "WARNING: Kernel address maps (/proc/{kallsyms,modules}) are restricted,\n"
"check /proc/sys/kernel/kptr_restrict.\n\n" "check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
"Samples in kernel functions may not be resolved if a suitable vmlinux\n" "Samples in kernel functions may not be resolved if a suitable vmlinux\n"
"file is not found in the buildid cache or in the vmlinux path.\n\n" "file is not found in the buildid cache or in the vmlinux path.\n\n"
"Samples in kernel modules won't be resolved at all.\n\n" "Samples in kernel modules won't be resolved at all.\n\n"

2
tools/perf/builtin-top.c
View File

@ -770,7 +770,7 @@ static void perf_event__process_sample(struct perf_tool *tool,
if (!perf_evlist__exclude_kernel(top->session->evlist)) { if (!perf_evlist__exclude_kernel(top->session->evlist)) {
ui__warning( ui__warning(
"Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n" "Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict.\n\n" "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
"Kernel%s samples will not be resolved.\n", "Kernel%s samples will not be resolved.\n",
al.map && map__has_symbols(al.map) ? al.map && map__has_symbols(al.map) ?
" modules" : ""); " modules" : "");

2
tools/perf/builtin-trace.c
View File

@ -1382,7 +1382,7 @@ static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long l
if (symbol_conf.kptr_restrict) { if (symbol_conf.kptr_restrict) {
pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n" pr_warning("Kernel address maps (/proc/{kallsyms,modules}) are restricted.\n\n"
"Check /proc/sys/kernel/kptr_restrict.\n\n" "Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n"
"Kernel samples will not be resolved.\n"); "Kernel samples will not be resolved.\n");
machine->kptr_restrict_warned = true; machine->kptr_restrict_warned = true;
return NULL; return NULL;