summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/evsel.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/util/evsel.c')
-rw-r--r--tools/perf/util/evsel.c188
1 files changed, 183 insertions, 5 deletions
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 7a2a3dc3ff03..a54701504606 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -22,6 +22,11 @@
#include <linux/perf_event.h>
#include "perf_regs.h"
+static struct {
+ bool sample_id_all;
+ bool exclude_guest;
+} perf_missing_features;
+
#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
static int __perf_evsel__sample_size(u64 sample_type)
@@ -429,6 +434,31 @@ const char *perf_evsel__name(struct perf_evsel *evsel)
return evsel->name ?: "unknown";
}
+const char *perf_evsel__group_name(struct perf_evsel *evsel)
+{
+ return evsel->group_name ?: "anon group";
+}
+
+int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
+{
+ int ret;
+ struct perf_evsel *pos;
+ const char *group_name = perf_evsel__group_name(evsel);
+
+ ret = scnprintf(buf, size, "%s", group_name);
+
+ ret += scnprintf(buf + ret, size - ret, " { %s",
+ perf_evsel__name(evsel));
+
+ for_each_group_member(pos, evsel)
+ ret += scnprintf(buf + ret, size - ret, ", %s",
+ perf_evsel__name(pos));
+
+ ret += scnprintf(buf + ret, size - ret, " }");
+
+ return ret;
+}
+
/*
* The enable_on_exec/disabled value strategy:
*
@@ -463,7 +493,7 @@ void perf_evsel__config(struct perf_evsel *evsel,
struct perf_event_attr *attr = &evsel->attr;
int track = !evsel->idx; /* only the first counter needs these */
- attr->sample_id_all = opts->sample_id_all_missing ? 0 : 1;
+ attr->sample_id_all = perf_missing_features.sample_id_all ? 0 : 1;
attr->inherit = !opts->no_inherit;
perf_evsel__set_sample_bit(evsel, IP);
@@ -513,7 +543,7 @@ void perf_evsel__config(struct perf_evsel *evsel,
if (opts->period)
perf_evsel__set_sample_bit(evsel, PERIOD);
- if (!opts->sample_id_all_missing &&
+ if (!perf_missing_features.sample_id_all &&
(opts->sample_time || !opts->no_inherit ||
perf_target__has_cpu(&opts->target)))
perf_evsel__set_sample_bit(evsel, TIME);
@@ -635,6 +665,11 @@ void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads)
}
}
+void perf_evsel__free_counts(struct perf_evsel *evsel)
+{
+ free(evsel->counts);
+}
+
void perf_evsel__exit(struct perf_evsel *evsel)
{
assert(list_empty(&evsel->node));
@@ -654,6 +689,28 @@ void perf_evsel__delete(struct perf_evsel *evsel)
free(evsel);
}
+static inline void compute_deltas(struct perf_evsel *evsel,
+ int cpu,
+ struct perf_counts_values *count)
+{
+ struct perf_counts_values tmp;
+
+ if (!evsel->prev_raw_counts)
+ return;
+
+ if (cpu == -1) {
+ tmp = evsel->prev_raw_counts->aggr;
+ evsel->prev_raw_counts->aggr = *count;
+ } else {
+ tmp = evsel->prev_raw_counts->cpu[cpu];
+ evsel->prev_raw_counts->cpu[cpu] = *count;
+ }
+
+ count->val = count->val - tmp.val;
+ count->ena = count->ena - tmp.ena;
+ count->run = count->run - tmp.run;
+}
+
int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
int cpu, int thread, bool scale)
{
@@ -669,6 +726,8 @@ int __perf_evsel__read_on_cpu(struct perf_evsel *evsel,
if (readn(FD(evsel, cpu, thread), &count, nv * sizeof(u64)) < 0)
return -errno;
+ compute_deltas(evsel, cpu, &count);
+
if (scale) {
if (count.run == 0)
count.val = 0;
@@ -707,6 +766,8 @@ int __perf_evsel__read(struct perf_evsel *evsel,
}
}
+ compute_deltas(evsel, -1, aggr);
+
evsel->counts->scaled = 0;
if (scale) {
if (aggr->run == 0) {
@@ -761,6 +822,13 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
pid = evsel->cgrp->fd;
}
+fallback_missing_features:
+ if (perf_missing_features.exclude_guest)
+ evsel->attr.exclude_guest = evsel->attr.exclude_host = 0;
+retry_sample_id:
+ if (perf_missing_features.sample_id_all)
+ evsel->attr.sample_id_all = 0;
+
for (cpu = 0; cpu < cpus->nr; cpu++) {
for (thread = 0; thread < threads->nr; thread++) {
@@ -777,13 +845,26 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
group_fd, flags);
if (FD(evsel, cpu, thread) < 0) {
err = -errno;
- goto out_close;
+ goto try_fallback;
}
}
}
return 0;
+try_fallback:
+ if (err != -EINVAL || cpu > 0 || thread > 0)
+ goto out_close;
+
+ if (!perf_missing_features.exclude_guest &&
+ (evsel->attr.exclude_guest || evsel->attr.exclude_host)) {
+ perf_missing_features.exclude_guest = true;
+ goto fallback_missing_features;
+ } else if (!perf_missing_features.sample_id_all) {
+ perf_missing_features.sample_id_all = true;
+ goto retry_sample_id;
+ }
+
out_close:
do {
while (--thread >= 0) {
@@ -1308,7 +1389,27 @@ int perf_evsel__fprintf(struct perf_evsel *evsel,
struct perf_attr_details *details, FILE *fp)
{
bool first = true;
- int printed = fprintf(fp, "%s", perf_evsel__name(evsel));
+ int printed = 0;
+
+ if (symbol_conf.event_group) {
+ struct perf_evsel *pos;
+
+ if (!perf_evsel__is_group_leader(evsel))
+ return 0;
+
+ if (evsel->nr_members > 1)
+ printed += fprintf(fp, "%s{", evsel->group_name ?: "");
+
+ printed += fprintf(fp, "%s", perf_evsel__name(evsel));
+ for_each_group_member(pos, evsel)
+ printed += fprintf(fp, ",%s", perf_evsel__name(pos));
+
+ if (evsel->nr_members > 1)
+ printed += fprintf(fp, "}");
+ goto out;
+ }
+
+ printed += fprintf(fp, "%s", perf_evsel__name(evsel));
if (details->verbose || details->freq) {
printed += comma_fprintf(fp, &first, " sample_freq=%" PRIu64,
@@ -1349,7 +1450,84 @@ int perf_evsel__fprintf(struct perf_evsel *evsel,
if_print(bp_type);
if_print(branch_sample_type);
}
-
+out:
fputc('\n', fp);
return ++printed;
}
+
+bool perf_evsel__fallback(struct perf_evsel *evsel, int err,
+ char *msg, size_t msgsize)
+{
+ if ((err == ENOENT || err == ENXIO) &&
+ evsel->attr.type == PERF_TYPE_HARDWARE &&
+ evsel->attr.config == PERF_COUNT_HW_CPU_CYCLES) {
+ /*
+ * If it's cycles then fall back to hrtimer based
+ * cpu-clock-tick sw counter, which is always available even if
+ * no PMU support.
+ *
+ * PPC returns ENXIO until 2.6.37 (behavior changed with commit
+ * b0a873e).
+ */
+ scnprintf(msg, msgsize, "%s",
+"The cycles event is not supported, trying to fall back to cpu-clock-ticks");
+
+ evsel->attr.type = PERF_TYPE_SOFTWARE;
+ evsel->attr.config = PERF_COUNT_SW_CPU_CLOCK;
+
+ free(evsel->name);
+ evsel->name = NULL;
+ return true;
+ }
+
+ return false;
+}
+
+int perf_evsel__open_strerror(struct perf_evsel *evsel,
+ struct perf_target *target,
+ int err, char *msg, size_t size)
+{
+ switch (err) {
+ case EPERM:
+ case EACCES:
+ return scnprintf(msg, size, "%s",
+ "You may not have permission to collect %sstats.\n"
+ "Consider tweaking /proc/sys/kernel/perf_event_paranoid:\n"
+ " -1 - Not paranoid at all\n"
+ " 0 - Disallow raw tracepoint access for unpriv\n"
+ " 1 - Disallow cpu events for unpriv\n"
+ " 2 - Disallow kernel profiling for unpriv",
+ target->system_wide ? "system-wide " : "");
+ case ENOENT:
+ return scnprintf(msg, size, "The %s event is not supported.",
+ perf_evsel__name(evsel));
+ case EMFILE:
+ return scnprintf(msg, size, "%s",
+ "Too many events are opened.\n"
+ "Try again after reducing the number of events.");
+ case ENODEV:
+ if (target->cpu_list)
+ return scnprintf(msg, size, "%s",
+ "No such device - did you specify an out-of-range profile CPU?\n");
+ break;
+ case EOPNOTSUPP:
+ if (evsel->attr.precise_ip)
+ return scnprintf(msg, size, "%s",
+ "\'precise\' request may not be supported. Try removing 'p' modifier.");
+#if defined(__i386__) || defined(__x86_64__)
+ if (evsel->attr.type == PERF_TYPE_HARDWARE)
+ return scnprintf(msg, size, "%s",
+ "No hardware sampling interrupt available.\n"
+ "No APIC? If so then you can boot the kernel with the \"lapic\" boot parameter to force-enable it.");
+#endif
+ break;
+ default:
+ break;
+ }
+
+ return scnprintf(msg, size,
+ "The sys_perf_event_open() syscall returned with %d (%s) for event (%s). \n"
+ "/bin/dmesg may provide additional information.\n"
+ "No CONFIG_PERF_EVENTS=y kernel support configured?\n",
+ err, strerror(err), perf_evsel__name(evsel));
+}
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-23 22:54:45 +0200