perf evsel: Cache associated event_format

We already lookup the associated event_format when reading the perf.data
header, so that we can cache the tracepoint name in evsel->name, so do
it a little further and save the event_format itself, so that we can
avoid relookups in tools that need to access it.

Change the tools to take the most obvious advantage, when they were
using pevent_find_event directly. More work is needed for further
removing the need of a pointer to pevent, such as when asking for event
field values ("common_pid" and the other common fields and per
event_format fields).

This is something that was planned but only got actually done when
Andrey Wagin needed to do this lookup at perf_tool->sample() time, when
we don't have access to pevent (session->pevent) to use with
pevent_find_event().

Cc: Andrey Wagin <avagin@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Link: http://lkml.kernel.org/n/tip-txkvew2ckko0b594ae8fbnyk@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

10 files changed, 70 insertions, 114 deletions

diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index ce35015f2dc..ffb93f42495 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -1,6 +1,7 @@
 #include "builtin.h"
 #include "perf.h"
 
+#include "util/evsel.h"
 #include "util/util.h"
 #include "util/cache.h"
 #include "util/symbol.h"
@@ -57,11 +58,6 @@ static unsigned long nr_allocs, nr_cross_allocs;
 
 #define PATH_SYS_NODE   "/sys/devices/system/node"
 
-struct perf_kmem {
-        struct perf_tool    tool;
-        struct perf_session *session;
-};
-
 static void init_cpunode_map(void)
 {
         FILE *fp;
@@ -283,16 +279,10 @@ static void process_free_event(void *data,
         s_alloc->alloc_cpu = -1;
 }
 
-static void process_raw_event(struct perf_tool *tool,
-                              union perf_event *raw_event __used, void *data,
+static void process_raw_event(struct perf_evsel *evsel, void *data,
                               int cpu, u64 timestamp, struct thread *thread)
 {
-        struct perf_kmem *kmem = container_of(tool, struct perf_kmem, tool);
-        struct event_format *event;
-        int type;
-
-        type = trace_parse_common_type(kmem->session->pevent, data);
-        event = pevent_find_event(kmem->session->pevent, type);
+        struct event_format *event = evsel->tp_format;
 
         if (!strcmp(event->name, "kmalloc") ||
             !strcmp(event->name, "kmem_cache_alloc")) {
@@ -313,10 +303,10 @@ static void process_raw_event(struct perf_tool *tool,
         }
 }
 
-static int process_sample_event(struct perf_tool *tool,
+static int process_sample_event(struct perf_tool *tool __used,
                                 union perf_event *event,
                                 struct perf_sample *sample,
-                                struct perf_evsel *evsel __used,
+                                struct perf_evsel *evsel,
                                 struct machine *machine)
 {
         struct thread *thread = machine__findnew_thread(machine, event->ip.pid);
@@ -329,18 +319,16 @@ static int process_sample_event(struct perf_tool *tool,
 
         dump_printf(" ... thread: %s:%d\n", thread->comm, thread->pid);
 
-        process_raw_event(tool, event, sample->raw_data, sample->cpu,
+        process_raw_event(evsel, sample->raw_data, sample->cpu,
                           sample->time, thread);
 
         return 0;
 }
 
-static struct perf_kmem perf_kmem = {
-        .tool = {
-                .sample                 = process_sample_event,
-                .comm                   = perf_event__process_comm,
-                .ordered_samples        = true,
-        },
+static struct perf_tool perf_kmem = {
+        .sample          = process_sample_event,
+        .comm            = perf_event__process_comm,
+        .ordered_samples = true,
 };
 
 static double fragmentation(unsigned long n_req, unsigned long n_alloc)
@@ -497,13 +485,10 @@ static int __cmd_kmem(void)
         int err = -EINVAL;
         struct perf_session *session;
 
-        session = perf_session__new(input_name, O_RDONLY, 0, false,
-                                    &perf_kmem.tool);
+        session = perf_session__new(input_name, O_RDONLY, 0, false, &perf_kmem);
         if (session == NULL)
                 return -ENOMEM;
 
-        perf_kmem.session = session;
-
         if (perf_session__create_kernel_maps(session) < 0)
                 goto out_delete;
 
@@ -511,7 +496,7 @@ static int __cmd_kmem(void)
                 goto out_delete;
 
         setup_pager();
-        err = perf_session__process_events(session, &perf_kmem.tool);
+        err = perf_session__process_events(session, &perf_kmem);
         if (err != 0)
                 goto out_delete;
         sort_result();
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
index b3c42854886..142b3033e4b 100644
--- a/tools/perf/builtin-lock.c
+++ b/tools/perf/builtin-lock.c
@@ -1,6 +1,7 @@
 #include "builtin.h"
 #include "perf.h"
 
+#include "util/evsel.h"
 #include "util/util.h"
 #include "util/cache.h"
 #include "util/symbol.h"
@@ -718,14 +719,10 @@ process_lock_release_event(void *data,
                 trace_handler->release_event(&release_event, event, cpu, timestamp, thread);
 }
 
-static void
-process_raw_event(void *data, int cpu, u64 timestamp, struct thread *thread)
+static void process_raw_event(struct perf_evsel *evsel, void *data, int cpu,
+                              u64 timestamp, struct thread *thread)
 {
-        struct event_format *event;
-        int type;
-
-        type = trace_parse_common_type(session->pevent, data);
-        event = pevent_find_event(session->pevent, type);
+        struct event_format *event = evsel->tp_format;
 
         if (!strcmp(event->name, "lock_acquire"))
                 process_lock_acquire_event(data, event, cpu, timestamp, thread);
@@ -849,7 +846,7 @@ static void dump_info(void)
 static int process_sample_event(struct perf_tool *tool __used,
                                 union perf_event *event,
                                 struct perf_sample *sample,
-                                struct perf_evsel *evsel __used,
+                                struct perf_evsel *evsel,
                                 struct machine *machine)
 {
         struct thread *thread = machine__findnew_thread(machine, sample->tid);
@@ -860,7 +857,7 @@ static int process_sample_event(struct perf_tool *tool __used,
                 return -1;
         }
 
-        process_raw_event(sample->raw_data, sample->cpu, sample->time, thread);
+        process_raw_event(evsel, sample->raw_data, sample->cpu, sample->time, thread);
 
         return 0;
 }
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 7a9ad2b1ee7..30ef82aca88 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -43,11 +43,6 @@ static u64			sleep_measurement_overhead;
 
 static unsigned long            nr_tasks;
 
-struct perf_sched {
-        struct perf_tool    tool;
-        struct perf_session *session;
-};
-
 struct sched_atom;
 
 struct task_desc {
@@ -1596,14 +1591,12 @@ typedef void (*tracepoint_handler)(struct perf_tool *tool, struct event_format *
                                    struct machine *machine,
                                    struct thread *thread);
 
-static int perf_sched__process_tracepoint_sample(struct perf_tool *tool,
+static int perf_sched__process_tracepoint_sample(struct perf_tool *tool __used,
                                                  union perf_event *event __used,
                                                  struct perf_sample *sample,
                                                  struct perf_evsel *evsel,
                                                  struct machine *machine)
 {
-        struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
-        struct pevent *pevent = sched->session->pevent;
         struct thread *thread = machine__findnew_thread(machine, sample->pid);
 
         if (thread == NULL) {
@@ -1617,25 +1610,18 @@ static int perf_sched__process_tracepoint_sample(struct perf_tool *tool,
 
         if (evsel->handler.func != NULL) {
                 tracepoint_handler f = evsel->handler.func;
-
-                if (evsel->handler.data == NULL)
-                        evsel->handler.data = pevent_find_event(pevent,
-                                                          evsel->attr.config);
-
-                f(tool, evsel->handler.data, sample, machine, thread);
+                f(tool, evsel->tp_format, sample, machine, thread);
         }
 
         return 0;
 }
 
-static struct perf_sched perf_sched = {
-        .tool = {
-                .sample          = perf_sched__process_tracepoint_sample,
-                .comm            = perf_event__process_comm,
-                .lost            = perf_event__process_lost,
-                .fork            = perf_event__process_task,
-                .ordered_samples = true,
-        },
+static struct perf_tool perf_sched = {
+        .sample          = perf_sched__process_tracepoint_sample,
+        .comm            = perf_event__process_comm,
+        .lost            = perf_event__process_lost,
+        .fork            = perf_event__process_task,
+        .ordered_samples = true,
 };
 
 static void read_events(bool destroy, struct perf_session **psession)
@@ -1652,18 +1638,15 @@ static void read_events(bool destroy, struct perf_session **psession)
         };
         struct perf_session *session;
 
-        session = perf_session__new(input_name, O_RDONLY, 0, false,
-                                    &perf_sched.tool);
+        session = perf_session__new(input_name, O_RDONLY, 0, false, &perf_sched);
         if (session == NULL)
                 die("No Memory");
 
-        perf_sched.session = session;
-
         err = perf_session__set_tracepoints_handlers(session, handlers);
         assert(err == 0);
 
         if (perf_session__has_traces(session, "record -R")) {
-                err = perf_session__process_events(session, &perf_sched.tool);
+                err = perf_session__process_events(session, &perf_sched);
                 if (err)
                         die("Failed to process events, error %d", err);
 
diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 1e60ab70b2b..8dba4707b03 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -262,14 +262,11 @@ static int perf_session__check_output_opt(struct perf_session *session)
         return 0;
 }
 
-static void print_sample_start(struct pevent *pevent,
-                               struct perf_sample *sample,
+static void print_sample_start(struct perf_sample *sample,
                                struct thread *thread,
                                struct perf_evsel *evsel)
 {
-        int type;
         struct perf_event_attr *attr = &evsel->attr;
-        struct event_format *event;
         const char *evname = NULL;
         unsigned long secs;
         unsigned long usecs;
@@ -307,20 +304,7 @@ static void print_sample_start(struct pevent *pevent,
         }
 
         if (PRINT_FIELD(EVNAME)) {
-                if (attr->type == PERF_TYPE_TRACEPOINT) {
-                        /*
-                         * XXX Do we really need this here?
-                         * perf_evlist__set_tracepoint_names should have done
-                         * this already
-                         */
-                        type = trace_parse_common_type(pevent,
-                                                       sample->raw_data);
-                        event = pevent_find_event(pevent, type);
-                        if (event)
-                                evname = event->name;
-                } else
-                        evname = perf_evsel__name(evsel);
-
+                evname = perf_evsel__name(evsel);
                 printf("%s: ", evname ? evname : "[unknown]");
         }
 }
@@ -416,7 +400,7 @@ static void print_sample_bts(union perf_event *event,
 }
 
 static void process_event(union perf_event *event __unused,
-                          struct pevent *pevent,
+                          struct pevent *pevent __unused,
                           struct perf_sample *sample,
                           struct perf_evsel *evsel,
                           struct machine *machine,
@@ -427,7 +411,7 @@ static void process_event(union perf_event *event __unused,
         if (output[attr->type].fields == 0)
                 return;
 
-        print_sample_start(pevent, sample, thread, evsel);
+        print_sample_start(sample, thread, evsel);
 
         if (is_bts_event(attr)) {
                 print_sample_bts(event, sample, evsel, machine, thread);
@@ -435,9 +419,8 @@ static void process_event(union perf_event *event __unused,
         }
 
         if (PRINT_FIELD(TRACE))
-                print_trace_event(pevent, sample->cpu, sample->raw_data,
-                                  sample->raw_size);
-
+                event_format__print(evsel->tp_format, sample->cpu,
+                                    sample->raw_data, sample->raw_size);
         if (PRINT_FIELD(ADDR))
                 print_sample_addr(event, sample, machine, thread, attr);
 
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index b559929983b..a56c4574b3f 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -56,6 +56,7 @@ struct perf_evsel {
         int                     ids;
         struct hists            hists;
         char                    *name;
+        struct event_format     *tp_format;
         union {
                 void            *priv;
                 off_t           id_offset;
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index e2b4864bd11..b2da439bce7 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2123,6 +2123,7 @@ static int perf_evsel__set_tracepoint_name(struct perf_evsel *evsel,
         if (event->name == NULL)
                 return -1;
 
+        evsel->tp_format = event;
         return 0;
 }
 
diff --git a/tools/perf/util/scripting-engines/trace-event-perl.c b/tools/perf/util/scripting-engines/trace-event-perl.c
index 02dfa19a467..c2662811659 100644
--- a/tools/perf/util/scripting-engines/trace-event-perl.c
+++ b/tools/perf/util/scripting-engines/trace-event-perl.c
@@ -237,16 +237,16 @@ static void define_event_symbols(struct event_format *event,
                 define_event_symbols(event, ev_name, args->next);
 }
 
-static inline
-struct event_format *find_cache_event(struct pevent *pevent, int type)
+static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 {
         static char ev_name[256];
         struct event_format *event;
+        int type = evsel->attr.config;
 
         if (events[type])
                 return events[type];
 
-        events[type] = event = pevent_find_event(pevent, type);
+        events[type] = event = evsel->tp_format;
         if (!event)
                 return NULL;
 
@@ -269,7 +269,6 @@ static void perl_process_tracepoint(union perf_event *perf_event __unused,
         unsigned long long val;
         unsigned long s, ns;
         struct event_format *event;
-        int type;
         int pid;
         int cpu = sample->cpu;
         void *data = sample->raw_data;
@@ -281,11 +280,9 @@ static void perl_process_tracepoint(union perf_event *perf_event __unused,
         if (evsel->attr.type != PERF_TYPE_TRACEPOINT)
                 return;
 
-        type = trace_parse_common_type(pevent, data);
-
-        event = find_cache_event(pevent, type);
+        event = find_cache_event(evsel);
         if (!event)
-                die("ug! no event found for type %d", type);
+                die("ug! no event found for type %d", evsel->attr.config);
 
         pid = trace_parse_common_pid(pevent, data);
 
diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
index ce4d1b0c386..8006978d839 100644
--- a/tools/perf/util/scripting-engines/trace-event-python.c
+++ b/tools/perf/util/scripting-engines/trace-event-python.c
@@ -27,6 +27,7 @@
 #include <errno.h>
 
 #include "../../perf.h"
+#include "../evsel.h"
 #include "../util.h"
 #include "../event.h"
 #include "../thread.h"
@@ -194,16 +195,21 @@ static void define_event_symbols(struct event_format *event,
                 define_event_symbols(event, ev_name, args->next);
 }
 
-static inline
-struct event_format *find_cache_event(struct pevent *pevent, int type)
+static inline struct event_format *find_cache_event(struct perf_evsel *evsel)
 {
         static char ev_name[256];
         struct event_format *event;
+        int type = evsel->attr.config;
 
+        /*
+         * XXX: Do we really need to cache this since now we have evsel->tp_format
+         * cached already? Need to re-read this "cache" routine that as well calls
+         * define_event_symbols() :-\
+         */
         if (events[type])
                 return events[type];
 
-        events[type] = event = pevent_find_event(pevent, type);
+        events[type] = event = evsel->tp_format;
         if (!event)
                 return NULL;
 
@@ -217,7 +223,7 @@ struct event_format *find_cache_event(struct pevent *pevent, int type)
 static void python_process_event(union perf_event *perf_event __unused,
                                  struct pevent *pevent,
                                  struct perf_sample *sample,
-                                 struct perf_evsel *evsel __unused,
+                                 struct perf_evsel *evsel,
                                  struct machine *machine __unused,
                                  struct thread *thread)
 {
@@ -228,7 +234,6 @@ static void python_process_event(union perf_event *perf_event __unused,
         unsigned long s, ns;
         struct event_format *event;
         unsigned n = 0;
-        int type;
         int pid;
         int cpu = sample->cpu;
         void *data = sample->raw_data;
@@ -239,11 +244,9 @@ static void python_process_event(union perf_event *perf_event __unused,
         if (!t)
                 Py_FatalError("couldn't create Python tuple");
 
-        type = trace_parse_common_type(pevent, data);
-
-        event = find_cache_event(pevent, type);
+        event = find_cache_event(evsel);
         if (!event)
-                die("ug! no event found for type %d", type);
+                die("ug! no event found for type %d", (int)evsel->attr.config);
 
         pid = trace_parse_common_pid(pevent, data);
 
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 0715c843c2e..12088348ac0 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -167,20 +167,11 @@ unsigned long long read_size(struct pevent *pevent, void *ptr, int size)
         return pevent_read_number(pevent, ptr, size);
 }
 
-void print_trace_event(struct pevent *pevent, int cpu, void *data, int size)
+void event_format__print(struct event_format *event,
+                         int cpu, void *data, int size)
 {
-        struct event_format *event;
         struct pevent_record record;
         struct trace_seq s;
-        int type;
-
-        type = trace_parse_common_type(pevent, data);
-
-        event = pevent_find_event(pevent, type);
-        if (!event) {
-                warning("ug! no event found for type %d", type);
-                return;
-        }
 
         memset(&record, 0, sizeof(record));
         record.cpu = cpu;
@@ -192,6 +183,19 @@ void print_trace_event(struct pevent *pevent, int cpu, void *data, int size)
         trace_seq_do_printf(&s);
 }
 
+void print_trace_event(struct pevent *pevent, int cpu, void *data, int size)
+{
+        int type = trace_parse_common_type(pevent, data);
+        struct event_format *event = pevent_find_event(pevent, type);
+
+        if (!event) {
+                warning("ug! no event found for type %d", type);
+                return;
+        }
+
+        event_format__print(event, cpu, data, size);
+}
+
 void print_event(struct pevent *pevent, int cpu, void *data, int size,
                  unsigned long long nsecs, char *comm)
 {
diff --git a/tools/perf/util/trace-event.h b/tools/perf/util/trace-event.h
index 8fef1d6687b..069d105e0fc 100644
--- a/tools/perf/util/trace-event.h
+++ b/tools/perf/util/trace-event.h
@@ -32,6 +32,8 @@ int bigendian(void);
 
 struct pevent *read_trace_init(int file_bigendian, int host_bigendian);
 void print_trace_event(struct pevent *pevent, int cpu, void *data, int size);
+void event_format__print(struct event_format *event,
+                         int cpu, void *data, int size);
 
 void print_event(struct pevent *pevent, int cpu, void *data, int size,
                  unsigned long long nsecs, char *comm);