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Date: Wed, 26 Jul 2017 10:23:24 -0700
From: tip-bot for Jiri Olsa <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: mingo@...nel.org, dsahern@...il.com, andi@...stfloor.org,
hpa@...or.com, jolsa@...nel.org, namhyung@...nel.org,
a.p.zijlstra@...llo.nl, tglx@...utronix.de,
linux-kernel@...r.kernel.org, alexander.shishkin@...ux.intel.com,
acme@...hat.com
Subject: [tip:perf/core] perf evsel: Add verbose output for
sys_perf_event_open fallback
Commit-ID: 2b04e0f88291c0dc7e12459bd3c3661d42209b4e
Gitweb: http://git.kernel.org/tip/2b04e0f88291c0dc7e12459bd3c3661d42209b4e
Author: Jiri Olsa <jolsa@...nel.org>
AuthorDate: Fri, 21 Jul 2017 14:12:09 +0200
Committer: Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Tue, 25 Jul 2017 11:23:53 -0300
perf evsel: Add verbose output for sys_perf_event_open fallback
Adding info about what is being switched off in the sys_perf_event_open
fallback.
New output (notice the 'switching off' lines):
$ perf stat -e '{cycles,instructions}' -vvv ls
Using CPUID GenuineIntel-6-3D
intel_pt default config: tsc
------------------------------------------------------------
perf_event_attr:
size 112
sample_type IDENTIFIER
read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
disabled 1
inherit 1
enable_on_exec 1
exclude_guest 1
------------------------------------------------------------
sys_perf_event_open: pid 3591 cpu -1 group_fd -1 flags 0x8
sys_perf_event_open failed, error -22
switching off cloexec flag
------------------------------------------------------------
perf_event_attr:
size 112
sample_type IDENTIFIER
read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
disabled 1
inherit 1
enable_on_exec 1
exclude_guest 1
------------------------------------------------------------
sys_perf_event_open: pid 3591 cpu -1 group_fd -1 flags 0
sys_perf_event_open failed, error -22
switching off exclude_guest, exclude_host
------------------------------------------------------------
perf_event_attr:
size 112
sample_type IDENTIFIER
read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
disabled 1
inherit 1
enable_on_exec 1
------------------------------------------------------------
sys_perf_event_open: pid 3591 cpu -1 group_fd -1 flags 0
sys_perf_event_open failed, error -22
switching off sample_id_all
------------------------------------------------------------
perf_event_attr:
size 112
sample_type IDENTIFIER
read_format TOTAL_TIME_ENABLED|TOTAL_TIME_RUNNING|ID|GROUP
disabled 1
inherit 1
enable_on_exec 1
...
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Andi Kleen <andi@...stfloor.org>
Cc: David Ahern <dsahern@...il.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/20170721121212.21414-2-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
tools/perf/util/evsel.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6dd069a..450b5fa 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -1671,31 +1671,39 @@ try_fallback:
*/
if (!perf_missing_features.write_backward && evsel->attr.write_backward) {
perf_missing_features.write_backward = true;
+ pr_debug2("switching off write_backward\n");
goto out_close;
} else if (!perf_missing_features.clockid_wrong && evsel->attr.use_clockid) {
perf_missing_features.clockid_wrong = true;
+ pr_debug2("switching off clockid\n");
goto fallback_missing_features;
} else if (!perf_missing_features.clockid && evsel->attr.use_clockid) {
perf_missing_features.clockid = true;
+ pr_debug2("switching off use_clockid\n");
goto fallback_missing_features;
} else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) {
perf_missing_features.cloexec = true;
+ pr_debug2("switching off cloexec flag\n");
goto fallback_missing_features;
} else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) {
perf_missing_features.mmap2 = true;
+ pr_debug2("switching off mmap2\n");
goto fallback_missing_features;
} else if (!perf_missing_features.exclude_guest &&
(evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
perf_missing_features.exclude_guest = true;
+ pr_debug2("switching off exclude_guest, exclude_host\n");
goto fallback_missing_features;
} else if (!perf_missing_features.sample_id_all) {
perf_missing_features.sample_id_all = true;
+ pr_debug2("switching off sample_id_all\n");
goto retry_sample_id;
} else if (!perf_missing_features.lbr_flags &&
(evsel->attr.branch_sample_type &
(PERF_SAMPLE_BRANCH_NO_CYCLES |
PERF_SAMPLE_BRANCH_NO_FLAGS))) {
perf_missing_features.lbr_flags = true;
+ pr_debug2("switching off branch sample type no (cycles/flags)\n");
goto fallback_missing_features;
}
out_close:
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