From: Arnaldo Carvalho de Melo <acme@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org, Jiri Olsa <jolsa@redhat.com>,
Adrian Hunter <adrian.hunter@intel.com>,
Corey Ashford <cjashfor@linux.vnet.ibm.com>,
David Ahern <dsahern@gmail.com>,
Frederic Weisbecker <fweisbec@gmail.com>,
Ingo Molnar <mingo@elte.hu>, Namhyung Kim <namhyung@kernel.org>,
Paul Mackerras <paulus@samba.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: [PATCH 09/10] perf tools: Check maximum frequency rate for record/top
Date: Tue, 5 Nov 2013 17:10:00 -0300 [thread overview]
Message-ID: <1383682201-19399-10-git-send-email-acme@infradead.org> (raw)
In-Reply-To: <1383682201-19399-1-git-send-email-acme@infradead.org>
From: Jiri Olsa <jolsa@redhat.com>
Adding the check for maximum allowed frequency rate defined in following
file:
/proc/sys/kernel/perf_event_max_sample_rate
When we cross the maximum value we fail and display detailed error
message with advise.
$ perf record -F 3000 ls
Maximum frequency rate (2000) reached.
Please use -F freq option with lower value or consider
tweaking /proc/sys/kernel/perf_event_max_sample_rate.
In case user does not specify the frequency and the default value cross
the maximum, we display warning and set the frequency value to the
current maximum.
$ perf record ls
Lowering default frequency rate to 2000.
Please consider tweaking /proc/sys/kernel/perf_event_max_sample_rate.
Same messages are used for 'perf top'.
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1383660887-1734-4-git-send-email-jolsa@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/builtin-record.c | 15 +---------
tools/perf/builtin-top.c | 15 +---------
tools/perf/util/evlist.h | 1 +
tools/perf/util/record.c | 71 +++++++++++++++++++++++++++++++++++++++++++++
4 files changed, 74 insertions(+), 28 deletions(-)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 8b45fcead5f6..ea4c04f7437e 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -958,20 +958,7 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
if (perf_evlist__create_maps(evsel_list, &rec->opts.target) < 0)
usage_with_options(record_usage, record_options);
- if (rec->opts.user_interval != ULLONG_MAX)
- rec->opts.default_interval = rec->opts.user_interval;
- if (rec->opts.user_freq != UINT_MAX)
- rec->opts.freq = rec->opts.user_freq;
-
- /*
- * User specified count overrides default frequency.
- */
- if (rec->opts.default_interval)
- rec->opts.freq = 0;
- else if (rec->opts.freq) {
- rec->opts.default_interval = rec->opts.freq;
- } else {
- ui__error("frequency and count are zero, aborting\n");
+ if (perf_record_opts__config(&rec->opts)) {
err = -EINVAL;
goto out_free_fd;
}
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 21897f0ffcd3..9acca8856ccb 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -1209,20 +1209,7 @@ int cmd_top(int argc, const char **argv, const char *prefix __maybe_unused)
if (top.delay_secs < 1)
top.delay_secs = 1;
- if (opts->user_interval != ULLONG_MAX)
- opts->default_interval = opts->user_interval;
- if (opts->user_freq != UINT_MAX)
- opts->freq = opts->user_freq;
-
- /*
- * User specified count overrides default frequency.
- */
- if (opts->default_interval)
- opts->freq = 0;
- else if (opts->freq) {
- opts->default_interval = opts->freq;
- } else {
- ui__error("frequency and count are zero, aborting\n");
+ if (perf_record_opts__config(opts)) {
status = -EINVAL;
goto out_delete_maps;
}
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 6e8acc9abe38..0617ce2a0679 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -99,6 +99,7 @@ void perf_evlist__set_id_pos(struct perf_evlist *evlist);
bool perf_can_sample_identifier(void);
void perf_evlist__config(struct perf_evlist *evlist,
struct perf_record_opts *opts);
+int perf_record_opts__config(struct perf_record_opts *opts);
int perf_evlist__prepare_workload(struct perf_evlist *evlist,
struct perf_target *target,
diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c
index 18d73aa2f0f8..c8845b107f60 100644
--- a/tools/perf/util/record.c
+++ b/tools/perf/util/record.c
@@ -2,6 +2,8 @@
#include "evsel.h"
#include "cpumap.h"
#include "parse-events.h"
+#include "fs.h"
+#include "util.h"
typedef void (*setup_probe_fn_t)(struct perf_evsel *evsel);
@@ -106,3 +108,72 @@ void perf_evlist__config(struct perf_evlist *evlist,
perf_evlist__set_id_pos(evlist);
}
+
+static int get_max_rate(unsigned int *rate)
+{
+ char path[PATH_MAX];
+ const char *procfs = procfs__mountpoint();
+
+ if (!procfs)
+ return -1;
+
+ snprintf(path, PATH_MAX,
+ "%s/sys/kernel/perf_event_max_sample_rate", procfs);
+
+ return filename__read_int(path, (int *) rate);
+}
+
+static int perf_record_opts__config_freq(struct perf_record_opts *opts)
+{
+ bool user_freq = opts->user_freq != UINT_MAX;
+ unsigned int max_rate;
+
+ if (opts->user_interval != ULLONG_MAX)
+ opts->default_interval = opts->user_interval;
+ if (user_freq)
+ opts->freq = opts->user_freq;
+
+ /*
+ * User specified count overrides default frequency.
+ */
+ if (opts->default_interval)
+ opts->freq = 0;
+ else if (opts->freq) {
+ opts->default_interval = opts->freq;
+ } else {
+ pr_err("frequency and count are zero, aborting\n");
+ return -1;
+ }
+
+ if (get_max_rate(&max_rate))
+ return 0;
+
+ /*
+ * User specified frequency is over current maximum.
+ */
+ if (user_freq && (max_rate < opts->freq)) {
+ pr_err("Maximum frequency rate (%u) reached.\n"
+ "Please use -F freq option with lower value or consider\n"
+ "tweaking /proc/sys/kernel/perf_event_max_sample_rate.\n",
+ max_rate);
+ return -1;
+ }
+
+ /*
+ * Default frequency is over current maximum.
+ */
+ if (max_rate < opts->freq) {
+ pr_warning("Lowering default frequency rate to %u.\n"
+ "Please consider tweaking "
+ "/proc/sys/kernel/perf_event_max_sample_rate.\n",
+ max_rate);
+ opts->freq = max_rate;
+ }
+
+ return 0;
+}
+
+int perf_record_opts__config(struct perf_record_opts *opts)
+{
+ return perf_record_opts__config_freq(opts);
+}
--
1.8.1.4
next prev parent reply other threads:[~2013-11-05 20:10 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-05 20:09 [GIT PULL 00/10] perf/core improvements and fixes Arnaldo Carvalho de Melo
2013-11-05 20:09 ` [PATCH 01/10] perf hists: Consolidate __hists__add_*entry() Arnaldo Carvalho de Melo
2013-11-05 21:52 ` Rodrigo Campos
2013-11-06 8:16 ` Namhyung Kim
2013-11-06 8:28 ` Rodrigo Campos
2013-11-06 13:42 ` Arnaldo Carvalho de Melo
2013-11-07 6:44 ` Namhyung Kim
2013-11-05 20:09 ` [PATCH 02/10] perf kvm: Disable live command if timerfd is not supported Arnaldo Carvalho de Melo
2013-11-05 20:09 ` [PATCH 03/10] tools/perf/build: Fix detection of non-core features Arnaldo Carvalho de Melo
2013-11-05 20:09 ` [PATCH 04/10] perf list: Remove a level of indentation Arnaldo Carvalho de Melo
2013-11-05 20:09 ` [PATCH 05/10] perf list: Add usage Arnaldo Carvalho de Melo
2013-11-05 20:09 ` [PATCH 06/10] perf tools: Factor sysfs code into generic fs object Arnaldo Carvalho de Melo
2013-11-05 20:09 ` [PATCH 07/10] perf fs: Rename NAME_find_mountpoint() to NAME__mountpoint() Arnaldo Carvalho de Melo
2013-11-05 20:09 ` [PATCH 08/10] perf fs: Add procfs support Arnaldo Carvalho de Melo
2013-11-05 20:10 ` Arnaldo Carvalho de Melo [this message]
2013-11-05 20:10 ` [PATCH 10/10] perf tools: Finish the removal of 'self' arguments Arnaldo Carvalho de Melo
2013-11-06 5:31 ` [GIT PULL 00/10] perf/core improvements and fixes Ingo Molnar
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