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Subject[tip:perf/core] perf tools: Add support to parse event group syntax
Commit-ID:  89efb029502d7f2d0993ed2aa9280c414336939c
Gitweb: http://git.kernel.org/tip/89efb029502d7f2d0993ed2aa9280c414336939c
Author: Jiri Olsa <jolsa@redhat.com>
AuthorDate: Wed, 8 Aug 2012 12:14:14 +0200
Committer: Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Tue, 14 Aug 2012 17:03:44 -0300

perf tools: Add support to parse event group syntax

Adding scanner/parser bits to parse event groups.

The grammar for group is:
groups: groups ',' group | group
group: group_name '{' events '}' group_mod
group_name: name | empty
group_mod: ':' group_mods | empty
group_mods: event_mod

It's possible to use standard event modifier as a modifier
for group. It'll be used as an update to existing event
modifiers.

It's necessary to use quoting ("'\) when specifying group on
command line, since {} characters are interpreted by most of
the shells.

It is now possible to specify groups in event syntax like:

'{cycles,faults}'
- anonymous group

'group1{cycles,faults}
- group with name 'group1'

'{cycles,faults}:k
- anonymous group with event modifier 'k'

'{cpu-clock,task-clock},{minor-faults,major-faults}'
- two anonymous groups

The grouping functionality itself is coming shortly.

Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.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>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ulrich Drepper <drepper@gmail.com>
Link: http://lkml.kernel.org/n/tip-p4j8bnvo879uokum4k4zk5q6@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
tools/perf/util/parse-events.c | 14 +++++-
tools/perf/util/parse-events.h | 4 +-
tools/perf/util/parse-events.l | 2 +
tools/perf/util/parse-events.y | 93 ++++++++++++++++++++++++++++++++++------
4 files changed, 97 insertions(+), 16 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 3ec4bfc..57d5809 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -611,19 +611,29 @@ int parse_events_add_pmu(struct list_head **list, int *idx,
pmu_event_name(head_config));
}

+int parse_events__modifier_group(struct list_head *list __used,
+ char *event_mod __used)
+{
+ return 0;
+}
+
+void parse_events__group(char *name __used, struct list_head *list __used)
+{
+}
+
void parse_events_update_lists(struct list_head *list_event,
struct list_head *list_all)
{
/*
* Called for single event definition. Update the
- * 'all event' list, and reinit the 'signle event'
+ * 'all event' list, and reinit the 'single event'
* list, for next event definition.
*/
list_splice_tail(list_event, list_all);
free(list_event);
}

-int parse_events_modifier(struct list_head *list, char *str)
+int parse_events__modifier_event(struct list_head *list, char *str)
{
struct perf_evsel *evsel;
int exclude = 0, exclude_GH = 0;
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 00416d7f..c3bb04c 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -79,7 +79,8 @@ int parse_events__term_str(struct parse_events__term **_term,
int parse_events__term_clone(struct parse_events__term **new,
struct parse_events__term *term);
void parse_events__free_terms(struct list_head *terms);
-int parse_events_modifier(struct list_head *list, char *str);
+int parse_events__modifier_event(struct list_head *list, char *str);
+int parse_events__modifier_group(struct list_head *list, char *event_mod);
int parse_events_add_tracepoint(struct list_head **list, int *idx,
char *sys, char *event);
int parse_events_add_numeric(struct list_head **list, int *idx,
@@ -91,6 +92,7 @@ int parse_events_add_breakpoint(struct list_head **list, int *idx,
void *ptr, char *type);
int parse_events_add_pmu(struct list_head **list, int *idx,
char *pmu , struct list_head *head_config);
+void parse_events__group(char *name, struct list_head *list);
void parse_events_update_lists(struct list_head *list_event,
struct list_head *list_all);
void parse_events_error(void *data, void *scanner, char const *msg);
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index e4abdf2..2c0d006 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -151,6 +151,8 @@ r{num_raw_hex} { return raw(yyscanner); }
- { return '-'; }
, { return ','; }
: { return ':'; }
+"{" { return '{'; }
+"}" { return '}'; }
= { return '='; }
\n { }

diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
index 423d331..15e6e97 100644
--- a/tools/perf/util/parse-events.y
+++ b/tools/perf/util/parse-events.y
@@ -30,7 +30,7 @@ do { \
%token PE_NAME
%token PE_MODIFIER_EVENT PE_MODIFIER_BP
%token PE_NAME_CACHE_TYPE PE_NAME_CACHE_OP_RESULT
-%token PE_PREFIX_MEM PE_PREFIX_RAW
+%token PE_PREFIX_MEM PE_PREFIX_RAW PE_PREFIX_GROUP
%token PE_ERROR
%type <num> PE_VALUE
%type <num> PE_VALUE_SYM_HW
@@ -53,6 +53,11 @@ do { \
%type <head> event_legacy_numeric
%type <head> event_legacy_raw
%type <head> event_def
+%type <head> event
+%type <head> events
+%type <head> group_def
+%type <head> group
+%type <head> groups

%union
{
@@ -64,33 +69,95 @@ do { \
%%

start:
-PE_START_EVENTS events
+PE_START_EVENTS start_events
|
-PE_START_TERMS terms
+PE_START_TERMS start_terms
+
+start_events: groups
+{
+ struct parse_events_data__events *data = _data;
+
+ parse_events_update_lists($1, &data->list);
+}
+
+groups:
+groups ',' group
+{
+ struct list_head *list = $1;
+ struct list_head *group = $3;
+
+ parse_events_update_lists(group, list);
+ $$ = list;
+}
+|
+groups ',' event
+{
+ struct list_head *list = $1;
+ struct list_head *event = $3;
+
+ parse_events_update_lists(event, list);
+ $$ = list;
+}
+|
+group
+|
+event
+
+group:
+group_def ':' PE_MODIFIER_EVENT
+{
+ struct list_head *list = $1;
+
+ ABORT_ON(parse_events__modifier_group(list, $3));
+ $$ = list;
+}
+|
+group_def
+
+group_def:
+PE_NAME '{' events '}'
+{
+ struct list_head *list = $3;
+
+ parse_events__group($1, list);
+ $$ = list;
+}
+|
+'{' events '}'
+{
+ struct list_head *list = $2;
+
+ parse_events__group(NULL, list);
+ $$ = list;
+}

events:
-events ',' event | event
+events ',' event
+{
+ struct list_head *event = $3;
+ struct list_head *list = $1;
+
+ parse_events_update_lists(event, list);
+ $$ = list;
+}
+|
+event

event:
event_def PE_MODIFIER_EVENT
{
- struct parse_events_data__events *data = _data;
+ struct list_head *list = $1;

/*
* Apply modifier on all events added by single event definition
* (there could be more events added for multiple tracepoint
* definitions via '*?'.
*/
- ABORT_ON(parse_events_modifier($1, $2));
- parse_events_update_lists($1, &data->list);
+ ABORT_ON(parse_events__modifier_event(list, $2));
+ $$ = list;
}
|
event_def
-{
- struct parse_events_data__events *data = _data;
-
- parse_events_update_lists($1, &data->list);
-}

event_def: event_pmu |
event_legacy_symbol |
@@ -222,7 +289,7 @@ PE_RAW
$$ = list;
}

-terms: event_config
+start_terms: event_config
{
struct parse_events_data__terms *data = _data;
data->terms = $1;

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