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| author | Igor Lubashev <ilubashe@akamai.com> | 2019-08-27 04:39:16 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2019-08-28 23:19:28 +0300 |
| commit | d06e5fad8c4692c6e5f1bd626056f23716bfe4a6 (patch) | |
| tree | d5ca6de87ba80ed3a1a50b74f095434ffcdc121b | |
| parent | 8859aedefefe7eeea5e67968b7fe39c828d589a0 (diff) | |
| download | linux-d06e5fad8c4692c6e5f1bd626056f23716bfe4a6.tar.xz | |
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>
| -rw-r--r-- | tools/perf/builtin-record.c | 2 | ||||
| -rw-r--r-- | tools/perf/builtin-top.c | 2 | ||||
| -rw-r--r-- | tools/perf/builtin-trace.c | 2 |
3 files changed, 3 insertions, 3 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 359bb8f33e57..afe558449677 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -2372,7 +2372,7 @@ int cmd_record(int argc, const char **argv) if (symbol_conf.kptr_restrict && !perf_evlist__exclude_kernel(rec->evlist)) pr_warning( "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" "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" diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 5970723cd55a..29e910fb2d9a 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -770,7 +770,7 @@ static void perf_event__process_sample(struct perf_tool *tool, 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" +"Check /proc/sys/kernel/kptr_restrict and /proc/sys/kernel/perf_event_paranoid.\n\n" "Kernel%s samples will not be resolved.\n", al.map && map__has_symbols(al.map) ? " modules" : ""); diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c index 8ea62fd2591d..58a75dd3a571 100644 --- a/tools/perf/builtin-trace.c +++ b/tools/perf/builtin-trace.c @@ -1382,7 +1382,7 @@ static char *trace__machine__resolve_kernel_addr(void *vmachine, unsigned long l if (symbol_conf.kptr_restrict) { 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"); machine->kptr_restrict_warned = true; return NULL; |