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Subject[PATCH 2/3] perf, tool: Add new event group management
Date
The current event grouping is basic. If you specify the '--group'
option for record/stat/top command, all the specified events become
members of a single group with the first event as a group leader.

This patch adds a functionality that allows to create event groups
based on the way they are specified on the command line. Extending
the '--group/-g' option power while preserving the current behaviour.

It is now possible to use '--group/-g' option with 'parsed' value,
which will create groups based on the command line events layout.

With the '--group/-g parsed' option specified, all events separated
by ',' within a single '-e' option now become members of a group with
the first event specified as a group leader. Another '-e' option with
multiple events creates separate group.

All groups are created with regards to threads and cpus. Thus
recording an event group within a 2 threads on server with
4 CPUs will create 8 separate groups.

Examples (first event in brackets is group leader):

# 1 group (cpu-clock,task-clock)
perf record --group -e cpu-clock,task-clock ls
perf record --group parsed -e cpu-clock,task-clock ls

# 2 groups (cpu-clock,task-clock) (minor-faults,major-faults)
perf record --group parsed -e cpu-clock,task-clock \
-e minor-faults,major-faults ls

# 1 group (cpu-clock,task-clock,minor-faults,major-faults)
perf record --group -e cpu-clock,task-clock \
-e minor-faults,major-faults ls

# 2 groups (cpu-clock,task-clock) (minor-faults,major-faults)
perf record --group parsed -e cpu-clock,task-clock \
-e minor-faults,major-faults -e instructions ls

# 1 group (cpu-clock,task-clock,minor-faults,major-faults,instructions)
perf record --group -e cpu-clock,task-clock \
-e minor-faults,major-faults -e instructions ls

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
---
tools/perf/Makefile | 2 ++
tools/perf/builtin-record.c | 8 +++++---
tools/perf/builtin-stat.c | 10 ++++++----
tools/perf/builtin-top.c | 8 +++++---
tools/perf/perf.h | 2 +-
tools/perf/util/evsel.c | 28 ++++++++++++++++++++++------
tools/perf/util/evsel.h | 9 +++++----
tools/perf/util/group.c | 23 +++++++++++++++++++++++
tools/perf/util/group.h | 25 +++++++++++++++++++++++++
tools/perf/util/parse-events.c | 6 ++++++
tools/perf/util/python.c | 4 ++++
tools/perf/util/top.h | 2 +-
12 files changed, 105 insertions(+), 22 deletions(-)
create mode 100644 tools/perf/util/group.c
create mode 100644 tools/perf/util/group.h
diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index ef6b621..c54b595 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -299,6 +299,7 @@ LIB_H += util/cpumap.h
LIB_H += util/top.h
LIB_H += $(ARCH_INCLUDE)
LIB_H += util/cgroup.h
+LIB_H += util/group.h

LIB_OBJS += $(OUTPUT)util/abspath.o
LIB_OBJS += $(OUTPUT)util/alias.o
@@ -356,6 +357,7 @@ LIB_OBJS += $(OUTPUT)util/util.o
LIB_OBJS += $(OUTPUT)util/xyarray.o
LIB_OBJS += $(OUTPUT)util/cpumap.o
LIB_OBJS += $(OUTPUT)util/cgroup.o
+LIB_OBJS += $(OUTPUT)util/group.o

BUILTIN_OBJS += $(OUTPUT)builtin-annotate.o

diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 766fa0a..581c72d 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -26,6 +26,7 @@
#include "util/symbol.h"
#include "util/cpumap.h"
#include "util/thread_map.h"
+#include "util/group.h"

#include <unistd.h>
#include <sched.h>
@@ -202,7 +203,7 @@ static void perf_record__open(struct perf_record *rec)
*/
bool time_needed = attr->sample_type & PERF_SAMPLE_TIME;

- if (opts->group && pos != first)
+ if (group_is_single(opts->group) && pos != first)
group_fd = first->fd;
retry_sample_id:
attr->sample_id_all = opts->sample_id_all_avail ? 1 : 0;
@@ -688,8 +689,9 @@ const struct option record_options[] = {
OPT_UINTEGER('F', "freq", &record.opts.user_freq, "profile at this frequency"),
OPT_UINTEGER('m', "mmap-pages", &record.opts.mmap_pages,
"number of mmap data pages"),
- OPT_BOOLEAN(0, "group", &record.opts.group,
- "put the counters into a counter group"),
+ OPT_CALLBACK_DEFAULT(0, "group", &record.opts.group, "[parsed]",
+ "put the counters into a counter group",
+ parse_group, PERF_GROUP_NONE),
OPT_BOOLEAN('g', "call-graph", &record.opts.call_graph,
"do call-graph (stack chain/backtrace) recording"),
OPT_INCR('v', "verbose", &verbose,
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index cc53de3..c28c852 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -55,6 +55,7 @@
#include "util/cpumap.h"
#include "util/thread.h"
#include "util/thread_map.h"
+#include "util/group.h"

#include <sys/prctl.h>
#include <math.h>
@@ -193,7 +194,7 @@ static int big_num_opt = -1;
static const char *cpu_list;
static const char *csv_sep = NULL;
static bool csv_output = false;
-static bool group = false;
+static int group;
static const char *output_name = NULL;
static FILE *output = NULL;
static int output_fd;
@@ -284,7 +285,7 @@ static int create_perf_stat_counter(struct perf_evsel *evsel,
struct perf_event_attr *attr = &evsel->attr;
struct xyarray *group_fd = NULL;

- if (group && evsel != first)
+ if (group_is_single(group) && evsel != first)
group_fd = first->fd;

if (scale)
@@ -1068,8 +1069,9 @@ static const struct option options[] = {
"stat events on existing thread id"),
OPT_BOOLEAN('a', "all-cpus", &system_wide,
"system-wide collection from all CPUs"),
- OPT_BOOLEAN('g', "group", &group,
- "put the counters into a counter group"),
+ OPT_CALLBACK_DEFAULT('g', "group", &group, "[parsed]",
+ "put the counters into a counter group",
+ parse_group, PERF_GROUP_NONE),
OPT_BOOLEAN('c', "scale", &scale,
"scale/normalize counters"),
OPT_INCR('v', "verbose", &verbose,
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index c3836b9..c1f205c 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -38,6 +38,7 @@
#include "util/cpumap.h"
#include "util/xyarray.h"
#include "util/sort.h"
+#include "util/group.h"

#include "util/debug.h"

@@ -830,7 +831,7 @@ static void perf_top__start_counters(struct perf_top *top)
struct perf_event_attr *attr = &counter->attr;
struct xyarray *group_fd = NULL;

- if (top->group && counter != first)
+ if (group_is_single(top->group) && counter != first)
group_fd = first->fd;

attr->sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_TID;
@@ -1120,8 +1121,9 @@ int cmd_top(int argc, const char **argv, const char *prefix __used)
"dump the symbol table used for profiling"),
OPT_INTEGER('f', "count-filter", &top.count_filter,
"only display functions with more events than this"),
- OPT_BOOLEAN('g', "group", &top.group,
- "put the counters into a counter group"),
+ OPT_CALLBACK_DEFAULT('g', "group", &top.group, "[parsed]",
+ "put the counters into a counter group",
+ parse_group, PERF_GROUP_NONE),
OPT_BOOLEAN('i', "inherit", &top.inherit,
"child tasks inherit counters"),
OPT_STRING(0, "sym-annotate", &top.sym_filter, "symbol name",
diff --git a/tools/perf/perf.h b/tools/perf/perf.h
index ea804f5..b2aa37a 100644
--- a/tools/perf/perf.h
+++ b/tools/perf/perf.h
@@ -189,7 +189,7 @@ struct perf_record_opts {
pid_t target_pid;
pid_t target_tid;
bool call_graph;
- bool group;
+ int group;
bool inherit_stat;
bool no_delay;
bool no_inherit;
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 4a8c8b0..280286a 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -14,6 +14,7 @@
#include "util.h"
#include "cpumap.h"
#include "thread_map.h"
+#include "group.h"

#define FD(e, x, y) (*(int *)xyarray__entry(e->fd, x, y))
#define GROUP_FD(group_fd, cpu) (*(int *)xyarray__entry(group_fd, cpu, 0))
@@ -284,8 +285,17 @@ int __perf_evsel__read(struct perf_evsel *evsel,
return 0;
}

+static int perf_evsel_group(struct perf_evsel *evsel,
+ int cpu, int thread)
+{
+ if (evsel->group_leader)
+ return FD(evsel->group_leader, cpu, thread);
+
+ return -1;
+}
+
static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group,
+ struct thread_map *threads, int group,
struct xyarray *group_fds)
{
int cpu, thread;
@@ -302,13 +312,19 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
}

for (cpu = 0; cpu < cpus->nr; cpu++) {
- int group_fd = group_fds ? GROUP_FD(group_fds, cpu) : -1;
+ int group_fd = -1;
+
+ if (group_is_single(group))
+ group_fd = group_fds ? GROUP_FD(group_fds, cpu) : -1;

for (thread = 0; thread < threads->nr; thread++) {

if (!evsel->cgrp)
pid = threads->map[thread];

+ if (group_is_parsed(group))
+ group_fd = perf_evsel_group(evsel, cpu, thread);
+
FD(evsel, cpu, thread) = sys_perf_event_open(&evsel->attr,
pid,
cpus->map[cpu],
@@ -318,7 +334,7 @@ static int __perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
goto out_close;
}

- if (group && group_fd == -1)
+ if (group_is_single(group) && group_fd == -1)
group_fd = FD(evsel, cpu, thread);
}
}
@@ -363,7 +379,7 @@ static struct {
};

int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group,
+ struct thread_map *threads, int group,
struct xyarray *group_fd)
{
if (cpus == NULL) {
@@ -378,7 +394,7 @@ int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
}

int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
- struct cpu_map *cpus, bool group,
+ struct cpu_map *cpus, int group,
struct xyarray *group_fd)
{
return __perf_evsel__open(evsel, cpus, &empty_thread_map.map, group,
@@ -386,7 +402,7 @@ int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
}

int perf_evsel__open_per_thread(struct perf_evsel *evsel,
- struct thread_map *threads, bool group,
+ struct thread_map *threads, int group,
struct xyarray *group_fd)
{
return __perf_evsel__open(evsel, &empty_cpu_map.map, threads, group,
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 326b8e4..db9ee0b 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -66,6 +66,7 @@ struct perf_evsel {
void *data;
} handler;
bool supported;
+ struct perf_evsel *group_leader;
};

struct cpu_map;
@@ -90,14 +91,14 @@ void perf_evsel__free_id(struct perf_evsel *evsel);
void perf_evsel__close_fd(struct perf_evsel *evsel, int ncpus, int nthreads);

int perf_evsel__open_per_cpu(struct perf_evsel *evsel,
- struct cpu_map *cpus, bool group,
+ struct cpu_map *cpus, int group,
struct xyarray *group_fds);
int perf_evsel__open_per_thread(struct perf_evsel *evsel,
- struct thread_map *threads, bool group,
+ struct thread_map *threads, int group,
struct xyarray *group_fds);
int perf_evsel__open(struct perf_evsel *evsel, struct cpu_map *cpus,
- struct thread_map *threads, bool group,
- struct xyarray *group_fds);
+ struct thread_map *threads, int group,
+ struct xyarray *group_fd);
void perf_evsel__close(struct perf_evsel *evsel, int ncpus, int nthreads);

#define perf_evsel__match(evsel, t, c) \
diff --git a/tools/perf/util/group.c b/tools/perf/util/group.c
new file mode 100644
index 0000000..89468a9
--- /dev/null
+++ b/tools/perf/util/group.c
@@ -0,0 +1,23 @@
+
+#include <linux/compiler.h>
+#include "types.h"
+#include "util.h"
+#include "parse-options.h"
+#include "group.h"
+
+int parse_group(const struct option *opt, const char *str,
+ int unset __used)
+{
+ int *group_opt = (int *) opt->value;
+
+ if (!str)
+ *group_opt = PERF_GROUP_SINGLE;
+ else if (!strcmp(str, "parsed"))
+ *group_opt = PERF_GROUP_PARSED;
+ else {
+ fprintf(stderr, "unknown group option value\n");
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/tools/perf/util/group.h b/tools/perf/util/group.h
new file mode 100644
index 0000000..ad80015
--- /dev/null
+++ b/tools/perf/util/group.h
@@ -0,0 +1,25 @@
+#ifndef __GROUP_H__
+#define __GROUP_H__
+
+struct option;
+
+enum perf_group_opt {
+ PERF_GROUP_NONE,
+ PERF_GROUP_SINGLE,
+ PERF_GROUP_PARSED
+};
+
+int parse_group(const struct option *opt, const char *str,
+ int unset);
+
+static inline bool group_is_single(int group)
+{
+ return group == PERF_GROUP_SINGLE;
+}
+
+static inline bool group_is_parsed(int group)
+{
+ return group == PERF_GROUP_PARSED;
+}
+
+#endif /* __GROUP_H__ */
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index b9c4189..b7913c3 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -25,6 +25,7 @@ struct event_symbol {
int parse_events_parse(void);

static struct perf_evlist *__evlist;
+static struct perf_evsel *group_leader;

#define CHW(x) .type = PERF_TYPE_HARDWARE, .config = PERF_COUNT_HW_##x
#define CSW(x) .type = PERF_TYPE_SOFTWARE, .config = PERF_COUNT_SW_##x
@@ -373,6 +374,10 @@ static int add_event(struct perf_event_attr *attr, char *name, char *mod)
if (!evsel->name)
return -ENOMEM;

+ evsel->group_leader = group_leader;
+ if (!group_leader)
+ group_leader = evsel;
+
strncpy(evsel->name, name, len);
return 0;
}
@@ -696,6 +701,7 @@ int parse_events(struct perf_evlist *evlist, const char *str, int unset __used)
int ret;

__evlist = evlist;
+ group_leader = NULL;

buffer = parse_events__scan_string(str);

diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 9dd47a4..b91a43b 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -7,6 +7,7 @@
#include "event.h"
#include "cpumap.h"
#include "thread_map.h"
+#include "group.h"

/* Define PyVarObject_HEAD_INIT for python 2.5 */
#ifndef PyVarObject_HEAD_INIT
@@ -828,6 +829,9 @@ static PyObject *pyrf_evlist__open(struct pyrf_evlist *pevlist,
if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|OOii", kwlist, &group))
return NULL;

+ if (group)
+ group = PERF_GROUP_SINGLE;
+
if (perf_evlist__open(evlist, group) < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h
index a248f3c..f545bc6 100644
--- a/tools/perf/util/top.h
+++ b/tools/perf/util/top.h
@@ -32,7 +32,7 @@ struct perf_top {
bool kptr_restrict_warned;
bool vmlinux_warned;
bool inherit;
- bool group;
+ int group;
bool sample_id_all_avail;
bool dump_symtab;
const char *cpu_list;
--
1.7.4


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