linux-kernel - [tip: perf/core] perf tools: Warn that perf_event

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Message-ID: <156710530833.10523.4547415862334821213.tip-bot2@tip-bot2>
Date:   Thu, 29 Aug 2019 19:01:48 -0000
From:   "tip-bot2 for Igor Lubashev" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Igor Lubashev <ilubashe@...mai.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        James Morris <jmorris@...ei.org>, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Suzuki Poulouse <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf tools: Warn that perf_event_paranoid can
 restrict kernel symbols

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     d06e5fad8c4692c6e5f1bd626056f23716bfe4a6
Gitweb:        https://git.kernel.org/tip/d06e5fad8c4692c6e5f1bd626056f23716bfe4a6
Author:        Igor Lubashev <ilubashe@...mai.com>
AuthorDate:    Mon, 26 Aug 2019 21:39:16 -04:00
Committer:     Arnaldo Carvalho de Melo <acme@...hat.com>
CommitterDate: Wed, 28 Aug 2019 17:19:28 -03:00

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@...mai.com>
Tested-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: James Morris <jmorris@...ei.org>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Suzuki Poulouse <suzuki.poulose@....com>
Cc: linux-arm-kernel@...ts.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@...hat.com>
---
 tools/perf/builtin-record.c | 2 +-
 tools/perf/builtin-top.c    | 2 +-
 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 359bb8f..afe5584 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 5970723..29e910f 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 8ea62fd..58a75dd 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;