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-rw-r--r--tools/perf/Documentation/perf-record.txt11
-rw-r--r--tools/perf/Documentation/perf-stat.txt11
-rw-r--r--tools/perf/Makefile2
-rw-r--r--tools/perf/builtin-record.c9
-rw-r--r--tools/perf/builtin-stat.c40
-rw-r--r--tools/perf/util/cgroup.c178
-rw-r--r--tools/perf/util/cgroup.h17
-rw-r--r--tools/perf/util/evsel.c16
-rw-r--r--tools/perf/util/evsel.h2
9 files changed, 276 insertions, 10 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index e032716c839..5a520f82529 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -137,6 +137,17 @@ Do not update the builid cache. This saves some overhead in situations
where the information in the perf.data file (which includes buildids)
is sufficient.
+-G name,...::
+--cgroup name,...::
+monitor only in the container (cgroup) called "name". This option is available only
+in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to
+container "name" are monitored when they run on the monitored CPUs. Multiple cgroups
+can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup
+to first event, second cgroup to second event and so on. It is possible to provide
+an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have
+corresponding events, i.e., they always refer to events defined earlier on the command
+line.
+
SEE ALSO
--------
linkperf:perf-stat[1], linkperf:perf-list[1]
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index b6da7affbbe..918cc38ee6d 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -83,6 +83,17 @@ This option is only valid in system-wide mode.
print counts using a CSV-style output to make it easy to import directly into
spreadsheets. Columns are separated by the string specified in SEP.
+-G name::
+--cgroup name::
+monitor only in the container (cgroup) called "name". This option is available only
+in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to
+container "name" are monitored when they run on the monitored CPUs. Multiple cgroups
+can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup
+to first event, second cgroup to second event and so on. It is possible to provide
+an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have
+corresponding events, i.e., they always refer to events defined earlier on the command
+line.
+
EXAMPLES
--------
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 94f73abdc56..bc4d9bf8a55 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -442,6 +442,7 @@ LIB_H += util/pstack.h
LIB_H += util/cpumap.h
LIB_H += util/top.h
LIB_H += $(ARCH_INCLUDE)
+LIB_H += util/cgroup.h
LIB_OBJS += $(OUTPUT)util/abspath.o
LIB_OBJS += $(OUTPUT)util/alias.o
@@ -496,6 +497,7 @@ LIB_OBJS += $(OUTPUT)util/probe-event.o
LIB_OBJS += $(OUTPUT)util/util.o
LIB_OBJS += $(OUTPUT)util/xyarray.o
LIB_OBJS += $(OUTPUT)util/cpumap.o
+LIB_OBJS += $(OUTPUT)util/cgroup.o
BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 12e0e41696d..a4aaadcb4c8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -807,6 +807,9 @@ const struct option record_options[] = {
"do not update the buildid cache"),
OPT_BOOLEAN('B', "no-buildid", &no_buildid,
"do not collect buildids in perf.data"),
+ OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
+ "monitor event in cgroup name only",
+ parse_cgroups),
OPT_END()
};
@@ -835,6 +838,12 @@ int cmd_record(int argc, const char **argv, const char *prefix __used)
write_mode = WRITE_FORCE;
}
+ if (nr_cgroups && !system_wide) {
+ fprintf(stderr, "cgroup monitoring only available in"
+ " system-wide mode\n");
+ usage_with_options(record_usage, record_options);
+ }
+
symbol__init();
if (no_buildid_cache || no_buildid)
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 806a9998fcd..21c02522249 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -390,6 +390,9 @@ static void nsec_printout(int cpu, struct perf_evsel *evsel, double avg)
fprintf(stderr, fmt, cpustr, msecs, csv_sep, event_name(evsel));
+ if (evsel->cgrp)
+ fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
+
if (csv_output)
return;
@@ -420,6 +423,9 @@ static void abs_printout(int cpu, struct perf_evsel *evsel, double avg)
fprintf(stderr, fmt, cpustr, avg, csv_sep, event_name(evsel));
+ if (evsel->cgrp)
+ fprintf(stderr, "%s%s", csv_sep, evsel->cgrp->name);
+
if (csv_output)
return;
@@ -460,9 +466,17 @@ static void print_counter_aggr(struct perf_evsel *counter)
int scaled = counter->counts->scaled;
if (scaled == -1) {
- fprintf(stderr, "%*s%s%-24s\n",
+ fprintf(stderr, "%*s%s%*s",
csv_output ? 0 : 18,
- "<not counted>", csv_sep, event_name(counter));
+ "<not counted>",
+ csv_sep,
+ csv_output ? 0 : -24,
+ event_name(counter));
+
+ if (counter->cgrp)
+ fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
+
+ fputc('\n', stderr);
return;
}
@@ -487,7 +501,6 @@ static void print_counter_aggr(struct perf_evsel *counter)
fprintf(stderr, " (scaled from %.2f%%)",
100 * avg_running / avg_enabled);
}
-
fprintf(stderr, "\n");
}
@@ -505,14 +518,18 @@ static void print_counter(struct perf_evsel *counter)
ena = counter->counts->cpu[cpu].ena;
run = counter->counts->cpu[cpu].run;
if (run == 0 || ena == 0) {
- fprintf(stderr, "CPU%*d%s%*s%s%-24s",
+ fprintf(stderr, "CPU%*d%s%*s%s%*s",
csv_output ? 0 : -4,
evsel_list->cpus->map[cpu], csv_sep,
csv_output ? 0 : 18,
"<not counted>", csv_sep,
+ csv_output ? 0 : -24,
event_name(counter));
- fprintf(stderr, "\n");
+ if (counter->cgrp)
+ fprintf(stderr, "%s%s", csv_sep, counter->cgrp->name);
+
+ fputc('\n', stderr);
continue;
}
@@ -529,7 +546,7 @@ static void print_counter(struct perf_evsel *counter)
100.0 * run / ena);
}
}
- fprintf(stderr, "\n");
+ fputc('\n', stderr);
}
}
@@ -642,6 +659,9 @@ static const struct option options[] = {
"disable CPU count aggregation"),
OPT_STRING('x', "field-separator", &csv_sep, "separator",
"print counts with custom separator"),
+ OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
+ "monitor event in cgroup name only",
+ parse_cgroups),
OPT_END()
};
@@ -682,9 +702,13 @@ int cmd_stat(int argc, const char **argv, const char *prefix __used)
if (run_count <= 0)
usage_with_options(stat_usage, options);
- /* no_aggr is for system-wide only */
- if (no_aggr && !system_wide)
+ /* no_aggr, cgroup are for system-wide only */
+ if ((no_aggr || nr_cgroups) && !system_wide) {
+ fprintf(stderr, "both cgroup and no-aggregation "
+ "modes only available in system-wide mode\n");
+
usage_with_options(stat_usage, options);
+ }
/* Set attrs and nr_counters if no event is selected and !null_run */
if (!null_run && !evsel_list->nr_entries) {
diff --git a/tools/perf/util/cgroup.c b/tools/perf/util/cgroup.c
new file mode 100644
index 00000000000..9fea7553522
--- /dev/null
+++ b/tools/perf/util/cgroup.c
@@ -0,0 +1,178 @@
+#include "util.h"
+#include "../perf.h"
+#include "parse-options.h"
+#include "evsel.h"
+#include "cgroup.h"
+#include "debugfs.h" /* MAX_PATH, STR() */
+#include "evlist.h"
+
+int nr_cgroups;
+
+static int
+cgroupfs_find_mountpoint(char *buf, size_t maxlen)
+{
+ FILE *fp;
+ char mountpoint[MAX_PATH+1], tokens[MAX_PATH+1], type[MAX_PATH+1];
+ char *token, *saved_ptr;
+ int found = 0;
+
+ fp = fopen("/proc/mounts", "r");
+ if (!fp)
+ return -1;
+
+ /*
+ * in order to handle split hierarchy, we need to scan /proc/mounts
+ * and inspect every cgroupfs mount point to find one that has
+ * perf_event subsystem
+ */
+ while (fscanf(fp, "%*s %"STR(MAX_PATH)"s %"STR(MAX_PATH)"s %"
+ STR(MAX_PATH)"s %*d %*d\n",
+ mountpoint, type, tokens) == 3) {
+
+ if (!strcmp(type, "cgroup")) {
+
+ token = strtok_r(tokens, ",", &saved_ptr);
+
+ while (token != NULL) {
+ if (!strcmp(token, "perf_event")) {
+ found = 1;
+ break;
+ }
+ token = strtok_r(NULL, ",", &saved_ptr);
+ }
+ }
+ if (found)
+ break;
+ }
+ fclose(fp);
+ if (!found)
+ return -1;
+
+ if (strlen(mountpoint) < maxlen) {
+ strcpy(buf, mountpoint);
+ return 0;
+ }
+ return -1;
+}
+
+static int open_cgroup(char *name)
+{
+ char path[MAX_PATH+1];
+ char mnt[MAX_PATH+1];
+ int fd;
+
+
+ if (cgroupfs_find_mountpoint(mnt, MAX_PATH+1))
+ return -1;
+
+ snprintf(path, MAX_PATH, "%s/%s", mnt, name);
+
+ fd = open(path, O_RDONLY);
+ if (fd == -1)
+ fprintf(stderr, "no access to cgroup %s\n", path);
+
+ return fd;
+}
+
+static int add_cgroup(struct perf_evlist *evlist, char *str)
+{
+ struct perf_evsel *counter;
+ struct cgroup_sel *cgrp = NULL;
+ int n;
+ /*
+ * check if cgrp is already defined, if so we reuse it
+ */
+ list_for_each_entry(counter, &evlist->entries, node) {
+ cgrp = counter->cgrp;
+ if (!cgrp)
+ continue;
+ if (!strcmp(cgrp->name, str))
+ break;
+
+ cgrp = NULL;
+ }
+
+ if (!cgrp) {
+ cgrp = zalloc(sizeof(*cgrp));
+ if (!cgrp)
+ return -1;
+
+ cgrp->name = str;
+
+ cgrp->fd = open_cgroup(str);
+ if (cgrp->fd == -1) {
+ free(cgrp);
+ return -1;
+ }
+ }
+
+ /*
+ * find corresponding event
+ * if add cgroup N, then need to find event N
+ */
+ n = 0;
+ list_for_each_entry(counter, &evlist->entries, node) {
+ if (n == nr_cgroups)
+ goto found;
+ n++;
+ }
+ if (cgrp->refcnt == 0)
+ free(cgrp);
+
+ return -1;
+found:
+ cgrp->refcnt++;
+ counter->cgrp = cgrp;
+ return 0;
+}
+
+void close_cgroup(struct cgroup_sel *cgrp)
+{
+ if (!cgrp)
+ return;
+
+ /* XXX: not reentrant */
+ if (--cgrp->refcnt == 0) {
+ close(cgrp->fd);
+ free(cgrp->name);
+ free(cgrp);
+ }
+}
+
+int parse_cgroups(const struct option *opt __used, const char *str,
+ int unset __used)
+{
+ struct perf_evlist *evlist = *(struct perf_evlist **)opt->value;
+ const char *p, *e, *eos = str + strlen(str);
+ char *s;
+ int ret;
+
+ if (list_empty(&evlist->entries)) {
+ fprintf(stderr, "must define events before cgroups\n");
+ return -1;
+ }
+
+ for (;;) {
+ p = strchr(str, ',');
+ e = p ? p : eos;
+
+ /* allow empty cgroups, i.e., skip */
+ if (e - str) {
+ /* termination added */
+ s = strndup(str, e - str);
+ if (!s)
+ return -1;
+ ret = add_cgroup(evlist, s);
+ if (ret) {
+ free(s);
+ return -1;
+ }
+ }
+ /* nr_cgroups is increased een for empty cgroups */
+ nr_cgroups++;
+ if (!p)
+ break;
+ str = p+1;
+ }
+ return 0;
+}
diff --git a/tools/perf/util/cgroup.h b/tools/perf/util/cgroup.h
new file mode 100644
index 00000000000..89acd6debdc
--- /dev/null
+++ b/tools/perf/util/cgroup.h
@@ -0,0 +1,17 @@
+#ifndef __CGROUP_H__
+#define __CGROUP_H__
+
+struct option;
+
+struct cgroup_sel {
+ char *name;
+ int fd;
+ int refcnt;
+};
+
+
+extern int nr_cgroups; /* number of explicit cgroups defined */
+extern void close_cgroup(struct cgroup_sel *cgrp);
+extern int parse_cgroups(const struct option *opt, const char *str, int unset);
+
+#endif /* __CGROUP_H__ */
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 211063eed47..c974e08d07a 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -85,6 +85,7 @@ void perf_evsel__exit(struct perf_evsel *evsel)
void perf_evsel__delete(struct perf_evsel *evsel)
{
perf_evsel__exit(evsel);
+ close_cgroup(evsel->cgrp);
free(evsel);
}
@@ -163,21 +164,32 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
struct thread_map *threads, bool group, bool inherit)
{
int cpu, thread;
+ unsigned long flags = 0;
+ int pid = -1;
if (evsel->fd == NULL &&
perf_evsel__alloc_fd(evsel, cpus->nr, threads->nr) < 0)
return -1;
+ if (evsel->cgrp) {
+ flags = PERF_FLAG_PID_CGROUP;
+ pid = evsel->cgrp->fd;
+ }
+
for (cpu = 0; cpu < cpus->nr; cpu++) {
int group_fd = -1;
evsel->attr.inherit = (cpus->map[cpu] < 0) && inherit;
for (thread = 0; thread < threads->nr; thread++) {
+
+ if (!evsel->cgrp)
+ pid = threads->map[thread];
+
FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
- threads->map[thread],
+ pid,
cpus->map[cpu],
- group_fd, 0);
+ group_fd, flags);
if (FD(evsel, cpu, thread) < 0)
goto out_close;
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index eecdc3aabc1..1d3d5a3dbe6 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -6,6 +6,7 @@
#include "../../../include/linux/perf_event.h"
#include "types.h"
#include "xyarray.h"
+#include "cgroup.h"
struct perf_counts_values {
union {
@@ -45,6 +46,7 @@ struct perf_evsel {
struct perf_counts *counts;
int idx;
void *priv;
+ struct cgroup_sel *cgrp;
};
struct cpu_map;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-11-20 02:04:35 +0000