* [PATCH 4/4] trace-cmd: Add "--sql" option to trace-cmd start and record sub commands
2020-02-17 17:39 [PATCH 0/4] trace-cmd: SQL-like syntax for ftrace histograms configuration Tzvetomir Stoyanov (VMware)
` (2 preceding siblings ...)
2020-02-17 17:39 ` [PATCH 3/4] trace-cmd: Clear error log " Tzvetomir Stoyanov (VMware)
@ 2020-02-17 17:39 ` Tzvetomir Stoyanov (VMware)
3 siblings, 0 replies; 6+ messages in thread
From: Tzvetomir Stoyanov (VMware) @ 2020-02-17 17:39 UTC (permalink / raw)
To: rostedt; +Cc: linux-trace-devel
Configuration of complex ftrace histograms could be hard, using the existing ftrace interface.
The "--sql" option is implemented to simplify this task. It uses a sql-like syntax to define
the histograms and generates necessary ftrace syntetic events and triggers. Each ftrace event
represents a sql tible, while the fields of this event are rows in the table.
Additional option "-V" is added to trace-cmd start and report sub commands, which can be used
to dump the auto generated ftrace synthetic events and triggers configuration.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
Documentation/trace-cmd-record.1.txt | 37 +
Makefile | 1 +
tracecmd/Makefile | 12 +-
tracecmd/include/trace-local.h | 4 +
tracecmd/sqlparser/Makefile | 52 +
tracecmd/sqlparser/sqlhist-api.h | 29 +
tracecmd/sqlparser/sqlhist-parse.c | 1454 ++++++++++++++++++++++++++
tracecmd/sqlparser/sqlhist.h | 34 +
tracecmd/sqlparser/sqlhist.l | 59 ++
tracecmd/sqlparser/sqlhist.y | 175 ++++
tracecmd/trace-record.c | 114 +-
tracecmd/trace-usage.c | 2 +
12 files changed, 1970 insertions(+), 3 deletions(-)
create mode 100644 tracecmd/sqlparser/Makefile
create mode 100644 tracecmd/sqlparser/sqlhist-api.h
create mode 100644 tracecmd/sqlparser/sqlhist-parse.c
create mode 100644 tracecmd/sqlparser/sqlhist.h
create mode 100644 tracecmd/sqlparser/sqlhist.l
create mode 100644 tracecmd/sqlparser/sqlhist.y
diff --git a/Documentation/trace-cmd-record.1.txt b/Documentation/trace-cmd-record.1.txt
index 0d75e43..fd482e1 100644
--- a/Documentation/trace-cmd-record.1.txt
+++ b/Documentation/trace-cmd-record.1.txt
@@ -343,6 +343,43 @@ OPTIONS
executed will not be changed. This is useful if you want to monitor the
output of the command being executed, but not see the output from trace-cmd.
+*--sql*::
+ Generate necessary ftrace syntetic events and triggers, based on the given
+ sql query. A simplified sql syntax can be used to describe ftrace histograms.
+ Each ftrace event represents a sql tible, while the fields of this event are
+ rows in the table. A sql aliases can be used to define synthetic events and
+ simplify the sql statement.
+
+ Example 1:
+ --sql 'select pid as key1, common_pid from sched_waking'
+ Configures a histogram, where the key is the pid from sched/sched_waking
+ event and the value is the common_pid filed from the same event.
+ The auto generated ftrace config, written in sched/sched_waking/trigger file
+ is:
+ hist:keys=pid:values=common_pid
+
+ Example 2:
+ --sql '(select start.common_timestamp as start_time, end.common_timestamp
+ as end_time, start.pid, (end_time - start_time) as delta
+ from sched_waking as start join sched_switch as end on
+ start.pid = end.next_pid) as first'
+ A more complex histogram example, using a synthetic event. The synthetic
+ event "first" is configured in synthetic_events file:
+ first u64 start_time u64 end_time pid_t pid u64 delta
+ After that, a histogram trigger is configured in sched/sched_waking/trigger
+ file:
+ hist:keys=pid:start_time=common_timestamp,__arg0__=pid
+ A second histogram trigger is configured in sched/sched_switch/trigger file:
+ hist:keys=next_pid:__arg1__=$start_time,__arg2__=$__arg0__,
+ delta=common_timestamp-$__arg1__:
+ onmatch(sched.sched_waking).trace(first,$__arg1__,common_timestamp,$__arg2__,$delta)
+ The "onmatch" histogram action is used to trigger the synthetic event "first"
+ with interested parameters, when there is a match between next_pid and pid
+ fields from both events.
+
+*-V*::
+ Dump ftrace configuration, auto generated by the *--sql* option.
+
EXAMPLES
--------
diff --git a/Makefile b/Makefile
index d75f143..8ca87cf 100644
--- a/Makefile
+++ b/Makefile
@@ -225,6 +225,7 @@ INCLUDES += -I$(src)/lib/traceevent/include
INCLUDES += -I$(src)/lib/trace-cmd/include
INCLUDES += -I$(src)/lib/tracefs/include
INCLUDES += -I$(src)/tracecmd/include
+INCLUDES += -I$(src)/tracecmd/sqlparser
INCLUDES += -I$(obj)/tracecmd/include
include $(src)/features.mk
diff --git a/tracecmd/Makefile b/tracecmd/Makefile
index 0976341..678dab3 100644
--- a/tracecmd/Makefile
+++ b/tracecmd/Makefile
@@ -5,6 +5,9 @@ EXTRAVERSION := $(TC_EXTRAVERSION)
bdir:=$(obj)/tracecmd
+sqldir:=$(bdir)/sqlparser
+LIBSQLPARSE = $(sqldir)/libsqlparse.a
+
TC_VERSION := $(bdir)/include/tc_version.h
TARGETS = $(bdir)/trace-cmd $(TC_VERSION)
@@ -42,6 +45,8 @@ ALL_OBJS := $(TRACE_CMD_OBJS:%.o=$(bdir)/%.o)
all_objs := $(sort $(ALL_OBJS))
all_deps := $(all_objs:$(bdir)/%.o=$(bdir)/.%.d)
+CFLAGS += -I$(sqldir)
+
CONFIG_INCLUDES =
CONFIG_LIBS = -lrt
CONFIG_FLAGS =
@@ -63,7 +68,8 @@ $(all_objs): | $(bdir)
$(bdir)/trace-cmd: $(ALL_OBJS)
$(Q)$(do_app_build)
-$(bdir)/trace-cmd: $(LIBTRACECMD_STATIC) $(LIBTRACEEVENT_STATIC) $(LIBTRACEFS_STATIC)
+$(bdir)/trace-cmd: $(LIBTRACECMD_STATIC) $(LIBTRACEEVENT_STATIC)\
+ $(LIBTRACEFS_STATIC) $(LIBSQLPARSE)
$(bdir)/%.o: %.c
$(Q)$(call do_compile)
@@ -81,8 +87,12 @@ ifneq ($(dep_includes),)
include $(dep_includes)
endif
+$(LIBSQLPARSE): force
+ $(Q)$(MAKE) -C $(sqldir) $@
+
clean:
$(RM) $(bdir)/*.a $(bdir)/*.so $(bdir)/*.o $(bdir)/.*.d $(TARGETS)
+ $(Q)$(MAKE) -C $(sqldir) $@
force:
.PHONY: clean
diff --git a/tracecmd/include/trace-local.h b/tracecmd/include/trace-local.h
index 7a0804e..108b9a0 100644
--- a/tracecmd/include/trace-local.h
+++ b/tracecmd/include/trace-local.h
@@ -11,6 +11,7 @@
#include "trace-cmd.h"
#include "event-utils.h"
+#include "sqlhist-api.h"
#define TRACE_AGENT_DEFAULT_PORT 823
@@ -213,6 +214,9 @@ struct buffer_instance {
char *max_graph_depth;
+ struct sqlhist_trigger *auto_triggers;
+ struct sqlhist_synth_event *synth_events;
+
int flags;
int tracing_on_init_val;
int tracing_on_fd;
diff --git a/tracecmd/sqlparser/Makefile b/tracecmd/sqlparser/Makefile
new file mode 100644
index 0000000..f648b18
--- /dev/null
+++ b/tracecmd/sqlparser/Makefile
@@ -0,0 +1,52 @@
+
+include $(src)/scripts/utils.mk
+
+bdir:=$(obj)/tracecmd/sqlparser
+
+TARGET = $(bdir)/libsqlparse.a
+
+all: $(TARGET)
+
+FLEX ?= flex
+BISON ?= bison
+
+OBJS =
+OBJS += sqlhist-parse.o
+OBJS += lex.yy.o
+OBJS += sqlhist.tab.o
+
+OBJS := $(OBJS:%.o=$(bdir)/%.o)
+DEPS := $(OBJS:$(bdir)/%.o=$(bdir)/.%.d)
+
+$(bdir):
+ @mkdir -p $(bdir)
+
+$(OBJS): | $(bdir)
+$(DEPS): | $(bdir)
+
+$(TARGET): $(OBJS)
+ $(call do_build_static_lib)
+
+sqlhist-parse.c: lex.yy.c sqlhist.tab.c
+
+$(bdir)/%.o: %.c
+ $(Q)$(call do_compile)
+
+$(DEPS): $(bdir)/.%.d: %.c
+ $(Q)$(CC) -M $(CPPFLAGS) $(CFLAGS) $< > $@
+
+$(OBJS): $(bdir)/%.o : $(bdir)/.%.d
+
+
+lex.yy.c: sqlhist.l
+ $(Q)$(FLEX) $^
+
+sqlhist.tab.c: sqlhist.y
+ $(Q)$(BISON) -d -o $@ $^
+
+clean:
+ $(RM) $(bdir)/*.o $(bdir)/*.a $(bdir)/.*.d
+ $(RM) lex.yy.c *~ sqlhist.output sqlhist.tab.[ch]
+
+PHONY += force
+force:
\ No newline at end of file
diff --git a/tracecmd/sqlparser/sqlhist-api.h b/tracecmd/sqlparser/sqlhist-api.h
new file mode 100644
index 0000000..a92cbb1
--- /dev/null
+++ b/tracecmd/sqlparser/sqlhist-api.h
@@ -0,0 +1,29 @@
+/* SPDX-License-Identifier: LGPL-2.0 */
+/*
+ * Copyright (C) 2020 VMware Inc, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+#ifndef __SQLHIST_API_H
+#define __SQLHIST_API_H
+
+struct sqlhist_trigger {
+ struct sqlhist_trigger *next;
+ char *system;
+ char *event;
+ char *config;
+};
+
+struct sqlhist_synth_event {
+ struct sqlhist_synth_event *next;
+ char *name;
+ char *config;
+};
+
+int sqlhist_parse(char *buff, size_t buff_size,
+ struct sqlhist_trigger **triggers,
+ struct sqlhist_synth_event **synt_events);
+
+void sqlhist_trigger_free(struct sqlhist_trigger *list);
+void sqlhist_synth_event_free(struct sqlhist_synth_event *list);
+
+#endif /* __SQLHIST_API_H */
diff --git a/tracecmd/sqlparser/sqlhist-parse.c b/tracecmd/sqlparser/sqlhist-parse.c
new file mode 100644
index 0000000..72e148d
--- /dev/null
+++ b/tracecmd/sqlparser/sqlhist-parse.c
@@ -0,0 +1,1454 @@
+// SPDX-License-Identifier: LGPL-2.0
+/*
+ * Copyright (C) 2020 VMware Inc, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <errno.h>
+#include <unistd.h>
+
+#include "trace-seq.h"
+#include "trace-local.h"
+#include "sqlhist.h"
+
+#define SQL_PARSE_DEBUG 0
+
+/*
+ * Ideally, we will conevert:
+ *
+ * trace-cmd start \
+ * --sql '(select start.common_timestamp as start_time,
+ * end.common_timestamp as end_time, start.pid,
+ * (start_time - end_time) as delta
+ * from sched_waking as start
+ * join sched_switch as end
+ * on start.pid = end.next_pid) as first'
+ *
+ * to this:
+ *
+ * # echo 'first u64 start_time u64 end_time pid_t pid u64 delta' >> synthetic_events
+ * # echo 'hist:keys=pid:start=common_timestamp' >
+ * events/sched/sched_waking/trigger
+ * # echo 'hist:keys=next_pid:start2=$start,delta=common_timestamp-$start:onmatch(sched.sched_waking).trace(first,$start2,common_timestamp,next_pid,$delta)' >
+ * events/sched/sched_switch/trigger
+ */
+
+#define HASH_BITS 10
+
+struct str_hash {
+ struct str_hash *next;
+ char *str;
+};
+
+static struct str_hash *str_hash[1 << HASH_BITS];
+
+enum label_type {
+ LABEL_STRING,
+ LABEL_EXPR,
+};
+
+struct label_map {
+ struct label_map *next;
+ enum label_type type;
+ char *label;
+ void *value;
+};
+
+struct match_map {
+ struct match_map *next;
+ const char *A;
+ const char *B;
+};
+
+struct selection {
+ struct selection *next;
+ const char *name;
+ void *item;
+};
+
+enum expr_type {
+ EXPR_FIELD,
+ EXPR_PLUS,
+ EXPR_MINUS,
+ EXPR_MULT,
+ EXPR_DIVID,
+};
+
+struct sql_table;
+
+struct expression {
+ enum expr_type type;
+ void *A;
+ void *B;
+ const char *name;
+ struct sql_table *table;
+};
+
+struct table_map {
+ struct table_map *next;
+ char *name;
+ struct sql_table *table;
+};
+
+struct sql_table {
+ char *name;
+ struct sql_table *parent;
+ struct sql_table *child;
+ struct label_map *labels;
+ struct match_map *matches;
+ struct table_map *tables;
+ struct selection *selections;
+ struct selection **next_selection;
+ const char *from;
+ const char *to;
+};
+
+static struct sql_table *curr_table;
+static struct sql_table *top_table;
+static struct table_map *table_list;
+
+static int parse_error;
+
+static struct tep_handle *tep;
+
+static int print_type(struct trace_seq *s, struct expression *e);
+
+static int no_table(void)
+{
+ if (curr_table)
+ return 0;
+#if SQL_PARSE_DEBUG
+ {
+ static int once;
+
+ if (!once++)
+ printf("No table?\n");
+ }
+#endif
+ return 1;
+}
+
+void table_start(void)
+{
+ struct sql_table *table;
+
+ table = calloc(1, sizeof(*table));
+ if (!table) {
+ parse_error++;
+ return;
+ }
+
+ table->next_selection = &table->selections;
+
+ table->parent = curr_table;
+ if (curr_table)
+ curr_table->child = table;
+ else
+ top_table = table;
+
+ curr_table = table;
+}
+
+void add_from(void *item)
+{
+ curr_table->from = show_expr(item);
+}
+
+void add_to(void *item)
+{
+ curr_table->to = show_expr(item);
+}
+
+static void add_table(const char *label)
+{
+ struct table_map *tmap;
+
+ if (no_table())
+ return;
+
+ tmap = malloc(sizeof(*tmap));
+ if (!tmap) {
+ parse_error++;
+ return;
+ }
+
+ tmap->table = curr_table;
+ tmap->name = store_str(label);
+
+ tmap->next = table_list;
+ table_list = tmap;
+}
+
+static struct sql_table *find_table(const char *name)
+{
+ struct table_map *tmap;
+
+ for (tmap = table_list; tmap; tmap = tmap->next)
+ if (strcmp(tmap->name, name) == 0)
+ return tmap->table;
+ return NULL;
+}
+
+void table_end(const char *name)
+{
+ static int anony_cnt;
+ char *tname;
+
+ if (!name)
+ tname = store_printf("Anonymous%d", anony_cnt++);
+ else
+ tname = store_str(name);
+
+ add_table(tname);
+
+ curr_table->name = tname;
+ curr_table = curr_table->parent;
+
+}
+
+void from_table_end(const char *name)
+{
+ if (curr_table->parent)
+ curr_table->parent->from = store_str(name);
+ table_end(name);
+}
+
+/* Just a histogram table */
+void simple_table_end(void)
+{
+}
+
+static void insert_label(const char *label, void *val, enum label_type type)
+{
+ struct label_map *lmap;
+ struct sql_table *table = curr_table;
+
+ if (!table)
+ table = top_table;
+
+ if (!table) {
+ no_table();
+ return;
+ }
+
+ lmap = malloc(sizeof(*lmap));
+ if (!lmap) {
+ parse_error++;
+ return;
+ }
+ lmap->label = store_str(label);
+ lmap->value = val;
+ lmap->type = type;
+
+ lmap->next = table->labels;
+ table->labels = lmap;
+}
+
+void add_label(const char *label, const char *val)
+{
+ insert_label(label, store_str(val), LABEL_STRING);
+}
+
+void add_match(const char *A, const char *B)
+{
+ struct match_map *map;
+
+ if (no_table())
+ return;
+
+ map = malloc(sizeof(*map));
+ if (!map) {
+ parse_error++;
+ return;
+ }
+ map->A = store_str(A);
+ map->B = store_str(B);
+
+ map->next = curr_table->matches;
+ curr_table->matches = map;
+}
+
+void add_selection(void *item)
+{
+ struct selection *selection;
+ struct expression *e = item;
+
+ if (no_table())
+ return;
+
+ selection = malloc(sizeof(*selection));
+ if (!selection) {
+ parse_error++;
+ return;
+ }
+ selection->item = e;
+ selection->name = e->name;
+ selection->next = NULL;
+ *curr_table->next_selection = selection;
+ curr_table->next_selection = &selection->next;
+}
+
+static char *expr_op_connect(void *A, void *B, char *op,
+ const char *(*show)(void *A))
+{
+ struct expression *eA = A;
+ struct expression *eB = B;
+ char *a = NULL, *b = NULL;
+ char *str = NULL;
+ char *ret = NULL;
+ int r;
+
+ if (eA->name) {
+ r = asprintf(&a, "%s AS %s", show(A), eA->name);
+ if (r < 0)
+ goto out;
+ }
+
+ if (eB->name) {
+ r = asprintf(&b, "%s AS %s", show(B), eB->name);
+ if (r < 0)
+ goto out;
+ }
+
+ r = asprintf(&str, "(%s %s %s)",
+ a ? a : show(A), op, b ? b : show(B));
+ if (r < 0)
+ goto out;
+
+ ret = store_str(str);
+out:
+ free(a);
+ free(b);
+ free(str);
+
+ if (!ret)
+ parse_error++;
+
+ return ret;
+}
+
+static const char *show_raw_expr(void *e);
+static const char *resolve(struct sql_table *table, const char *label);
+
+static const char *expand(const char *str)
+{
+ char *exp = strdup(str);
+ const char *label;
+ const char *ret;
+ char *p;
+
+ if (!exp) {
+ parse_error++;
+ return NULL;
+ }
+
+ p = strstr(exp, ".");
+ if (p) {
+ *p = 0;
+ label = resolve(curr_table, exp);
+ ret = store_printf("%s.%s", label, p+1);
+ *p = '.';
+ } else {
+ ret = resolve(curr_table, str);
+ }
+ free(exp);
+ return ret;
+}
+
+static const char *__show_expr(struct expression *e, bool eval)
+{
+ const char *(*show)(void *e);
+ char *ret;
+
+ if (eval)
+ show = show_raw_expr;
+ else
+ show = show_expr;
+
+ switch (e->type) {
+ case EXPR_FIELD:
+ ret = e->A;
+ if (eval)
+ return expand(e->A);
+ break;
+ case EXPR_PLUS:
+ ret = expr_op_connect(e->A, e->B, "+", show);
+ break;
+ case EXPR_MINUS:
+ ret = expr_op_connect(e->A, e->B, "-", show);
+ break;
+ case EXPR_MULT:
+ ret = expr_op_connect(e->A, e->B, "*", show);
+ break;
+ case EXPR_DIVID:
+ ret = expr_op_connect(e->A, e->B, "/", show);
+ break;
+ }
+ return ret;
+}
+
+static const char *show_raw_expr(void *e)
+{
+ return __show_expr(e, true);
+}
+
+const char *show_expr(void *expr)
+{
+ struct expression *e = expr;
+
+ if (e->name)
+ return e->name;
+
+ return __show_expr(expr, false);
+}
+
+static struct expression *create_expression(void *A, void *B, enum expr_type type)
+{
+ struct expression *e;
+
+ e = calloc(sizeof(*e), 1);
+ if (!e) {
+ parse_error++;
+ return NULL;
+ }
+ e->A = A;
+ e->B = B;
+ e->type = type;
+ e->table = curr_table;
+
+ return e;
+}
+
+void *add_plus(void *A, void *B)
+{
+ return create_expression(A, B, EXPR_PLUS);
+}
+
+void *add_minus(void *A, void *B)
+{
+ return create_expression(A, B, EXPR_MINUS);
+}
+
+void *add_mult(void *A, void *B)
+{
+ return create_expression(A, B, EXPR_MULT);
+}
+
+void *add_divid(void *A, void *B)
+{
+ return create_expression(A, B, EXPR_DIVID);
+}
+
+void add_expr(const char *label, void *A)
+{
+ struct expression *e = A;
+
+ insert_label(label, A, LABEL_EXPR);
+ e->name = store_str(label);
+}
+
+void *add_field(const char *field, const char *label)
+{
+ struct expression *e;
+
+ e = create_expression(store_str(field), NULL, EXPR_FIELD);
+ if (label)
+ add_expr(label, e);
+
+ return e;
+}
+
+static inline unsigned int quick_hash(const char *str)
+{
+ unsigned int val = 0;
+ int len = strlen(str);
+
+ for (; len >= 4; str += 4, len -= 4) {
+ val += str[0];
+ val += str[1] << 8;
+ val += str[2] << 16;
+ val += str[3] << 24;
+ }
+ for (; len > 0; str++, len--)
+ val += str[0] << (len * 8);
+
+ val *= 2654435761;
+
+ return val & ((1 << HASH_BITS) - 1);
+}
+
+
+static struct str_hash *find_string(const char *str)
+{
+ unsigned int key = quick_hash(str);
+ struct str_hash *hash;
+
+ for (hash = str_hash[key]; hash; hash = hash->next) {
+ if (!strcmp(hash->str, str))
+ return hash;
+ }
+ return NULL;
+}
+
+/*
+ * If @str is found, then return the hash string.
+ * This lets store_str() know to free str.
+ */
+static char **add_hash(const char *str)
+{
+ struct str_hash *hash;
+ unsigned int key;
+
+ hash = find_string(str);
+ if (hash)
+ return &hash->str;
+
+ hash = malloc(sizeof(*hash));
+ if (!hash) {
+ parse_error++;
+ return NULL;
+ }
+ key = quick_hash(str);
+ hash->next = str_hash[key];
+ str_hash[key] = hash;
+ hash->str = NULL;
+ return &hash->str;
+}
+
+char *store_str(const char *str)
+{
+ char **pstr = add_hash(str);
+
+ if (!(*pstr))
+ *pstr = strdup(str);
+
+ return *pstr;
+}
+
+char *store_printf(const char *fmt, ...)
+{
+ va_list ap;
+ char **pstr;
+ char *str;
+ int ret;
+
+ va_start(ap, fmt);
+ ret = vasprintf(&str, fmt, ap);
+ va_end(ap);
+
+ if (!ret) {
+ parse_error++;
+ return NULL;
+ }
+
+ pstr = add_hash(str);
+ if (*pstr)
+ free(str);
+ else
+ *pstr = str;
+
+ return *pstr;
+}
+
+#if SQL_PARSE_DEBUG
+static void dump_label_map(struct sql_table *table)
+{
+ struct label_map *lmap;
+ struct table_map *tmap;
+
+ if (table->labels)
+ printf("%s Labels:\n", table->name);
+ for (lmap = table->labels; lmap; lmap = lmap->next) {
+ switch (lmap->type) {
+ case LABEL_STRING:
+ printf(" %s = %s\n",
+ lmap->label, (char *)lmap->value);
+ break;
+ case LABEL_EXPR:
+ printf(" %s = (%s)\n", lmap->label,
+ show_raw_expr(lmap->value));
+ break;
+ }
+ }
+ if (table->tables)
+ printf("%s Tables:\n", table->name);
+ for (tmap = table->tables; tmap; tmap = tmap->next)
+ printf(" %s = Table %s\n", tmap->name, tmap->table->name);
+}
+
+static void dump_match_map(struct sql_table *table)
+{
+ struct match_map *map;
+
+ if (table->matches)
+ printf("%s Matches:\n", table->name);
+ for (map = table->matches; map; map = map->next)
+ printf(" %s = %s\n", map->A, map->B);
+
+}
+
+static void dump_selections(struct sql_table *table)
+{
+ struct selection *sel;
+ struct trace_seq s;
+
+ trace_seq_init(&s);
+ if (table->selections)
+ trace_seq_printf(&s, "%s Selections:\n", table->name);
+ for (sel = table->selections; sel; sel = sel->next) {
+ trace_seq_printf(&s, " %s::\n\t", sel->name);
+ show_raw_expr(sel->item);
+ print_type(&s, sel->item);
+ trace_seq_printf(&s, "\n --\n");
+ }
+ trace_seq_do_printf(&s);
+ trace_seq_destroy(&s);
+}
+
+static void dump_table(struct sql_table *table)
+{
+ struct sql_table *save_curr = curr_table;
+
+ if (!table)
+ return;
+
+ printf("\nTable: %s\n\tFrom: %s\n", table->name, table->from);
+
+ dump_table(find_table(table->from));
+
+ curr_table = table;
+
+ dump_label_map(table);
+ dump_match_map(table);
+ dump_selections(table);
+
+ curr_table = save_curr;
+
+ printf("\n\tTo: %s\n", table->to);
+ dump_table(find_table(table->to));
+}
+
+
+static void dump_tables(void)
+{
+ static int debug = 1;
+
+ if (!debug)
+ return;
+
+ dump_table(top_table);
+}
+#endif
+
+static const char *event_match(const char *event, const char *val, int len)
+{
+ if (strncmp(event, val, len) == 0 && val[len] == '.')
+ return val + len + 1;
+
+ return NULL;
+}
+
+static char *make_dynamic_arg(void)
+{
+ static int arg_cnt;
+
+ return store_printf("__arg%d__", arg_cnt++);
+}
+
+static struct tep_event *find_event(struct tep_handle *tep, const char *name)
+{
+ static struct tep_event stub_event = {
+ .system = "(system)",
+ };
+
+ if (tep)
+ return tep_find_event_by_name(tep, NULL, name);
+
+ return &stub_event;
+}
+
+static struct tep_format_field *find_field(struct tep_event *event, char *name)
+{
+ static struct tep_format_field stub_field = {
+ .type = "(unknown)",
+ };
+
+ if (tep)
+ return tep_find_any_field(event, name);
+
+ return &stub_field;
+}
+
+static int print_type(struct trace_seq *s, struct expression *e)
+{
+ struct tep_format_field *field;
+ struct tep_event *event;
+ char *name = NULL;
+ char *tok;
+ int ret = -1;
+
+ while (e && e->type != EXPR_FIELD)
+ e = e->A;
+
+ if (!e)
+ return -1;
+
+ name = strdup(show_raw_expr(e));
+ if (!name)
+ return -1;
+
+ tok = strtok(name, ".");
+
+ event = find_event(tep, tok);
+ if (!event) {
+ tok = strtok(NULL, ".");
+ if (!tok)
+ goto out;
+ event = find_event(tep, tok);
+ }
+
+ tok = strtok(NULL, ".");
+ if (!tok || !event)
+ goto out;
+
+ if (strcmp(tok, "common_timestamp") == 0) {
+ trace_seq_printf(s, " u64 ");
+ } else {
+ field = find_field(event, tok);
+ if (field)
+ trace_seq_printf(s, " %s ", field->type);
+ else
+ goto out;
+ }
+
+ ret = 0;
+
+out:
+ free(name);
+ return ret;
+}
+
+static int print_synthetic_field(struct trace_seq *s, struct sql_table *table,
+ struct selection *selection)
+{
+ struct expression *e = selection->item;
+ const char *name;
+ const char *actual;
+ const char *field;
+ const char *to;
+ int len;
+ int ret;
+
+ ret = print_type(s, e);
+ if (ret < 0)
+ return ret;
+
+ name = selection->name;
+ if (!name)
+ name = e->name;
+ if (name) {
+ trace_seq_printf(s, "%s", name);
+ return 0;
+ }
+
+ to = resolve(table, table->to);
+ len = strlen(to);
+
+ actual = show_raw_expr(e);
+ field = event_match(to, actual, len);
+ if (field) {
+ trace_seq_printf(s, "%s", field);
+ return 0;
+ }
+
+ selection->name = make_dynamic_arg();
+ e->name = selection->name;
+
+ field = strstr(actual, ".");
+ if (field) {
+ /* Need to check for common_timestamp */
+ trace_seq_printf(s, "%s", field + 1);
+ } else {
+ trace_seq_printf(s, "%s", e->name);
+ }
+
+ return 0;
+}
+
+static int make_synthetic_events(struct sql_table *table,
+ struct sqlhist_synth_event **synt_events)
+{
+ int ret;
+ struct trace_seq str;
+ struct selection *selection;
+ struct sqlhist_synth_event *synt_event = NULL;
+ struct sql_table *save_curr = curr_table;
+
+ if (!table || !table->to)
+ return 0;
+
+ ret = make_synthetic_events(find_table(table->from), synt_events);
+ if (ret < 0)
+ return ret;
+
+ trace_seq_init(&str);
+ synt_event = calloc(1, sizeof(struct sqlhist_synth_event));
+ if (!synt_event)
+ goto error;
+ synt_event->name = strdup(table->name);
+ if (!synt_event->name)
+ goto error;
+
+ curr_table = table;
+ trace_seq_printf(&str, "%s ", table->name);
+ for (selection = table->selections; selection; selection = selection->next) {
+ if (print_synthetic_field(&str, table, selection) < 0)
+ goto error;
+ }
+
+ synt_event->config = strdup(str.buffer);
+ if (!synt_event->config)
+ goto error;
+
+ curr_table = save_curr;
+ trace_seq_destroy(&str);
+
+ if (*synt_events)
+ (*synt_events)->next = synt_event;
+ else
+ *synt_events = synt_event;
+
+ return make_synthetic_events(find_table(table->to), synt_events);
+
+error:
+ trace_seq_destroy(&str);
+ if (synt_event) {
+ free(synt_event->name);
+ free(synt_event->config);
+ free(synt_event);
+ }
+
+ return -1;
+}
+
+static const char *resolve(struct sql_table *table, const char *label)
+{
+ struct sql_table *save_curr = curr_table;
+ struct label_map *lmap;
+ struct expression *e;
+
+ curr_table = table;
+
+ for (lmap = table->labels; lmap; lmap = lmap->next)
+ if (strcmp(lmap->label, label) == 0)
+ break;
+
+ if (lmap) {
+ switch (lmap->type) {
+ case LABEL_STRING:
+ label = (char *)lmap->value;
+ break;
+ case LABEL_EXPR:
+ e = lmap->value;
+ label = show_raw_expr(e);
+ break;
+ }
+ }
+
+ curr_table = save_curr;
+
+ return label;
+}
+
+static int print_key(struct trace_seq *s, struct sql_table *table,
+ const char *event, const char *key1, const char *key2)
+{
+ int len = strlen(event);
+ const char *field;
+
+ field = event_match(event, key1, len);
+ if (field)
+ trace_seq_printf(s, "%s", field);
+
+ field = event_match(event, key2, len);
+ if (field)
+ trace_seq_printf(s, "%s", field);
+
+ return 0;
+}
+
+static int print_keys(struct trace_seq *s,
+ struct sql_table *table, const char *event)
+{
+ int ret = 0;
+ struct selection *selection;
+ struct match_map *map;
+ struct expression *e;
+ char *f, *p;
+ int start = 0;
+
+ if (event) {
+ f = strdup(event);
+ if (!f)
+ return -1;
+ p = strstr(f, ".");
+ if (p)
+ *p = '\0';
+
+ for (map = table->matches; map; map = map->next) {
+ if (start++)
+ trace_seq_printf(s, ",");
+ ret = print_key(s, table, f,
+ expand(map->A), expand(map->B));
+ if (ret < 0)
+ break;
+ }
+
+ free(f);
+ } else {
+ for (selection = table->selections; selection; selection = selection->next) {
+ e = selection->item;
+ if (!e->name || strncmp(e->name, "key", 3) != 0)
+ continue;
+ if (start++)
+ trace_seq_printf(s, ",");
+ trace_seq_printf(s, "%s", show_raw_expr(e));
+ }
+ }
+
+ return ret;
+}
+
+enum value_type {
+ VALUE_TO,
+ VALUE_FROM,
+};
+
+static void print_val_delim(struct trace_seq *s, bool *start)
+{
+ if (*start) {
+ trace_seq_printf(s, ":");
+ *start = false;
+ } else
+ trace_seq_printf(s, ",");
+}
+
+struct var_list {
+ struct var_list *next;
+ const char *var;
+ const char *val;
+};
+
+static const char *find_var(struct var_list **vars, const char *val)
+{
+ struct var_list *v;
+
+ for (v = *vars; v; v = v->next) {
+ if (strcmp(v->val, val) == 0)
+ return v->var;
+ }
+
+ return NULL;
+}
+
+static int add_var(struct var_list **vars, const char *var, const char *val)
+{
+ struct var_list *v;
+
+ v = malloc(sizeof(*v));
+ if (!v)
+ return -1;
+
+ v->var = var;
+ v->val = val;
+ v->next = *vars;
+ *vars = v;
+
+ return 0;
+}
+
+static int print_to_expr(struct trace_seq *s,
+ struct sql_table *table, const char *event,
+ struct expression *e, struct var_list **vars)
+{
+ int ret = 0;
+ const char *actual;
+ const char *field;
+ const char *var;
+ int len = strlen(event);
+
+ switch (e->type) {
+ case EXPR_FIELD:
+ actual = show_raw_expr(e);
+ field = event_match(event, actual, len);
+ if (field) {
+ trace_seq_printf(s, "%s", field);
+ break;
+ }
+
+ field = strstr(actual, ".");
+ if (!field) {
+ trace_seq_printf(s, "%s", field);
+ break;
+ }
+ var = find_var(vars, actual);
+ if (!var)
+ return -1;
+ trace_seq_printf(s, "$%s", var);
+ break;
+ default:
+ ret = print_to_expr(s, table, event, e->A, vars);
+ if (ret < 0)
+ break;
+ switch (e->type) {
+ case EXPR_PLUS:
+ trace_seq_printf(s, "+");
+ break;
+ case EXPR_MINUS:
+ trace_seq_printf(s, "-");
+ break;
+ case EXPR_MULT:
+ trace_seq_printf(s, "*");
+ break;
+ case EXPR_DIVID:
+ trace_seq_printf(s, "/");
+ break;
+ default:
+ break;
+ }
+ ret = print_to_expr(s, table, event, e->B, vars);
+ }
+
+ return ret;
+}
+
+static int print_from_expr(struct trace_seq *s, struct sql_table *table,
+ const char *event, struct expression *e,
+ bool *start, struct var_list **vars)
+{
+ int ret = 0;
+ const char *actual;
+ const char *field;
+ int len = strlen(event);
+
+ switch (e->type) {
+ case EXPR_FIELD:
+ actual = show_raw_expr(e);
+ field = event_match(event, actual, len);
+ if (field && !find_var(vars, actual)) {
+ print_val_delim(s, start);
+ if (!e->name)
+ e->name = make_dynamic_arg();
+ trace_seq_printf(s, "%s=%s", e->name, field);
+ ret = add_var(vars, e->name, actual);
+ break;
+ }
+ break;
+ default:
+ ret = print_from_expr(s, table, event, e->A, start, vars);
+ if (ret < 0)
+ break;
+ ret = print_from_expr(s, table, event, e->B, start, vars);
+ }
+ return ret;
+}
+
+static int print_value(struct trace_seq *s, struct sql_table *table,
+ const char *event, struct selection *selection,
+ enum value_type type, bool *start,
+ struct var_list **vars)
+{
+ int ret = 0;
+ struct expression *e = selection->item;
+ const char *name = selection->name;
+ int len = strlen(event);
+ const char *actual;
+ const char *field;
+
+ switch (e->type) {
+ case EXPR_FIELD:
+ if (!selection->name || !e->name)
+ break;
+ actual = show_raw_expr(e);
+ field = event_match(event, actual, len);
+ if (field) {
+ if (type != VALUE_TO) {
+ print_val_delim(s, start);
+ trace_seq_printf(s, "%s=%s", e->name, field);
+ ret = add_var(vars, e->name, actual);
+ }
+ } else if (type == VALUE_TO) {
+ const char *arg;
+ /*
+ * The selection wants to show the from,
+ * We need to save the from field in a variable
+ */
+ print_val_delim(s, start);
+ arg = make_dynamic_arg();
+ trace_seq_printf(s, "%s=$%s", arg, e->name);
+ ret = add_var(vars, arg, actual);
+ if (ret < 0)
+ break;
+ /* Now use the this arg for the parameters */
+ selection->name = arg;
+ }
+ break;
+ default:
+ if (type == VALUE_TO) {
+ print_val_delim(s, start);
+ trace_seq_printf(s, "%s=", name);
+ ret = print_to_expr(s, table, event, e, vars);
+ } else {
+ ret = print_from_expr(s, table, event, e, start, vars);
+ }
+ break;
+ }
+
+ return ret;
+}
+
+static int print_values(struct trace_seq *s, struct sql_table *table,
+ const char *event, enum value_type type,
+ struct var_list **vars)
+{
+ int ret = -1;
+ struct selection *selection;
+ struct expression *e;
+ char *f = NULL, *p;
+ bool start = true;
+
+ if (event) {
+ f = strdup(event);
+ if (!f)
+ goto out;
+ p = strstr(f, ".");
+ if (p)
+ *p = '\0';
+
+ for (selection = table->selections; selection; selection = selection->next) {
+ ret = print_value(s, table, f, selection, type, &start, vars);
+ if (ret < 0)
+ goto out;
+ }
+ ret = 0;
+ } else {
+ for (selection = table->selections; selection; selection = selection->next) {
+ e = selection->item;
+ if (e->name && strncmp(e->name, "key", 3) == 0)
+ continue;
+ if (start) {
+ trace_seq_printf(s, ":values=");
+ start = false;
+ } else {
+ trace_seq_printf(s, ",");
+ }
+ trace_seq_printf(s, "%s", show_raw_expr(e));
+ }
+ ret = 0;
+ }
+out:
+ free(f);
+ return ret;
+}
+
+static int print_trace_field(struct trace_seq *s, struct sql_table *table,
+ struct selection *selection)
+{
+ struct expression *e = selection->item;
+ const char *name;
+ const char *actual;
+ const char *field;
+ const char *to;
+ int len;
+
+ to = resolve(table, table->to);
+ len = strlen(to);
+
+ actual = show_raw_expr(e);
+ field = event_match(to, actual, len);
+ if (field) {
+ trace_seq_printf(s, ",%s", field);
+ return 0;
+ }
+
+ name = selection->name;
+ if (!name)
+ name = e->name;
+ if (name) {
+ trace_seq_printf(s, ",$%s", name);
+ return 0;
+ }
+
+ return -1;
+}
+
+static int print_trace(struct trace_seq *s, struct sql_table *table)
+{
+ struct selection *selection;
+ int ret;
+
+ trace_seq_printf(s, ".trace(%s", table->name);
+
+ for (selection = table->selections; selection; selection = selection->next) {
+ ret = print_trace_field(s, table, selection);
+ if (ret < 0)
+ return ret;
+ }
+ trace_seq_printf(s, ")");
+ return 0;
+}
+
+static int print_system_event(const char *text,
+ char **sys_name, char **event_name)
+{
+ struct tep_event *event;
+ char *name = strdup(text);
+ char *tok;
+
+ *sys_name = NULL;
+ *event_name = NULL;
+
+ strtok(name, ".");
+ tok = strtok(NULL, ".");
+ if (tok) {
+ *sys_name = strdup(tok);
+ *event_name = strdup(name);
+ goto out;
+ }
+
+ event = find_event(tep, name);
+ if (!event)
+ goto out;
+
+ *sys_name = strdup(event->system);
+ *event_name = strdup(name);
+
+ out:
+ free(name);
+ if (!*sys_name || !*event_name) {
+ free(*sys_name);
+ free(*event_name);
+ *sys_name = NULL;
+ *event_name = NULL;
+ return -1;
+ }
+ return 0;
+}
+
+static int make_histograms(struct sql_table *table,
+ struct sqlhist_trigger **triggers)
+{
+ int ret;
+ struct sqlhist_trigger *trigger = NULL;
+ struct trace_seq str;
+ struct sql_table *save_curr = curr_table;
+ struct var_list *vars = NULL;
+ const char *from = NULL;
+ const char *to;
+ char *sys_name = NULL, *event_name = NULL;
+
+ if (!table)
+ return 0;
+
+ /* Need to do children and younger siblings first */
+ ret = make_histograms(find_table(table->from), triggers);
+ if (ret < 0)
+ return ret;
+ trace_seq_init(&str);
+ curr_table = table;
+ trigger = calloc(1, sizeof(struct sqlhist_trigger));
+ if (!trigger)
+ goto error;
+
+ if (table->to)
+ from = resolve(table, table->from);
+
+ trace_seq_printf(&str, "hist:keys=");
+ ret = print_keys(&str, table, from);
+ if (ret < 0)
+ goto error;
+ ret = print_values(&str, table, from, VALUE_FROM, &vars);
+ if (ret < 0)
+ goto error;
+
+ trigger->config = strdup(str.buffer);
+ if (!trigger->config)
+ goto error;
+
+ if (!table->to)
+ from = resolve(table, table->from);
+ ret = print_system_event(from, &trigger->system, &trigger->event);
+ if (ret < 0)
+ goto error;
+
+ if (*triggers)
+ (*triggers)->next = trigger;
+ else
+ *triggers = trigger;
+
+ if (!table->to)
+ goto out;
+
+ trigger = calloc(1, sizeof(struct sqlhist_trigger));
+ if (!trigger)
+ goto error;
+
+ trace_seq_reset(&str);
+ trace_seq_printf(&str, "hist:keys=");
+ to = resolve(table, table->to);
+ ret = print_keys(&str, table, to);
+ if (ret < 0)
+ goto error;
+ ret = print_values(&str, table, to, VALUE_TO, &vars);
+ if (ret < 0)
+ goto error;
+ trace_seq_printf(&str, ":onmatch(");
+ print_system_event(from, &sys_name, &event_name);
+ if (!sys_name || !event_name)
+ goto error;
+ trace_seq_printf(&str, "%s.%s", sys_name, event_name);
+ trace_seq_printf(&str, ")");
+
+ ret = print_trace(&str, table);
+ if (ret < 0)
+ goto error;
+
+ print_system_event(to, &trigger->system, &trigger->event);
+ if (ret < 0)
+ goto error;
+
+ trigger->config = strdup(str.buffer);
+ if (!trigger->config)
+ goto error;
+
+ if (*triggers)
+ (*triggers)->next = trigger;
+ else
+ *triggers = trigger;
+
+ while (vars) {
+ struct var_list *v = vars;
+
+ vars = v->next;
+ free(v);
+ }
+ free(sys_name);
+ free(event_name);
+ out:
+ curr_table = save_curr;
+ trace_seq_destroy(&str);
+ return make_histograms(find_table(table->to), triggers);
+
+error:
+ free(sys_name);
+ free(event_name);
+ trace_seq_destroy(&str);
+ if (trigger) {
+ free(trigger->config);
+ free(trigger->event);
+ free(trigger->system);
+ free(trigger);
+ }
+ return -1;
+}
+
+static char *buffer;
+static size_t buffer_size;
+static size_t buffer_idx;
+
+int my_yyinput(char *buf, int max)
+{
+ if (!buffer)
+ return read(0, buf, max);
+
+ if (buffer_idx + max > buffer_size)
+ max = buffer_size - buffer_idx;
+
+ if (max)
+ memcpy(buf, buffer + buffer_idx, max);
+
+ buffer_idx += max;
+
+ return max;
+}
+
+void sqlhist_cleanup(void)
+{
+ parse_error = 0;
+ buffer_idx = 0;
+
+}
+
+void sqlhist_destroy(void)
+{
+ sqlhist_cleanup();
+ tep_free(tep);
+}
+
+void sqlhist_trigger_free(struct sqlhist_trigger *list)
+{
+ struct sqlhist_trigger *del, *trigger = list;
+
+ while (trigger) {
+ del = trigger;
+ trigger = trigger->next;
+ free(del->config);
+ free(del->event);
+ free(del->system);
+ free(del);
+ }
+}
+
+void sqlhist_synth_event_free(struct sqlhist_synth_event *list)
+{
+ struct sqlhist_synth_event *del, *event = list;
+
+ while (event) {
+ del = event;
+ event = event->next;
+ free(del->config);
+ free(del->name);
+ free(del);
+ }
+}
+
+int sqlhist_parse(char *buff, size_t buff_size,
+ struct sqlhist_trigger **triggers,
+ struct sqlhist_synth_event **synt_events)
+{
+ int ret;
+
+ sqlhist_cleanup();
+ buffer = buff;
+ buffer_size = buff_size;
+
+ if (!tep)
+ tep = tracefs_local_events(NULL);
+ if (!tep)
+ return -1;
+
+ ret = yyparse();
+ if (ret < 0)
+ return ret;
+
+#if SQL_PARSE_DEBUG
+ dump_tables();
+#endif
+
+ if (parse_error)
+ return -1;
+
+ ret = make_synthetic_events(top_table, synt_events);
+ if (ret < 0)
+ return ret;
+
+ ret = make_histograms(top_table, triggers);
+ if (ret < 0)
+ return ret;
+
+ return ret;
+}
diff --git a/tracecmd/sqlparser/sqlhist.h b/tracecmd/sqlparser/sqlhist.h
new file mode 100644
index 0000000..68ff196
--- /dev/null
+++ b/tracecmd/sqlparser/sqlhist.h
@@ -0,0 +1,34 @@
+/* SPDX-License-Identifier: LGPL-2.0 */
+/*
+ * Copyright (C) 2020 VMware Inc, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+#ifndef __SQLHIST_H
+#define __SQLHIST_H
+
+#include <tracefs.h>
+#include "sqlhist.tab.h"
+
+char *store_str(const char *str);
+char *store_printf(const char *fmt, ...);
+void add_label(const char *label, const char *val);
+void add_match(const char *A, const char *B);
+void table_start(void);
+void table_end(const char *name);
+void from_table_end(const char *name);
+void simple_table_end(void);
+
+const char *show_expr(void *expr);
+void *add_plus(void *A, void *B);
+void *add_minus(void *A, void *B);
+void *add_mult(void *A, void *B);
+void *add_divid(void *A, void *B);
+void *add_field(const char *field, const char *label);
+
+void add_expr(const char *name, void *expr);
+
+void add_selection(void *item);
+void add_from(void *item);
+void add_to(void *item);
+
+#endif /* __SQLHIST_H */
diff --git a/tracecmd/sqlparser/sqlhist.l b/tracecmd/sqlparser/sqlhist.l
new file mode 100644
index 0000000..99dddcc
--- /dev/null
+++ b/tracecmd/sqlparser/sqlhist.l
@@ -0,0 +1,59 @@
+%{
+/* SPDX-License-Identifier: LGPL-2.0
+ *
+ * Copyright (C) 2020 VMware Inc, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+
+#include <stdarg.h>
+#include "sqlhist.h"
+
+extern int my_yyinput(char *buf, int max);
+
+#undef YY_INPUT
+#define YY_INPUT(b, r, m) (r = my_yyinput(b, m))
+
+#define YY_NO_INPUT
+#define YY_NO_UNPUT
+
+static int line_no = 1;
+
+%}
+
+%option caseless
+
+%%
+
+select { return SELECT; }
+as { return AS; }
+from { return FROM; }
+join { return JOIN; }
+on { return ON; }
+
+\$[a-z][a-z0-9_]* { yylval.string = store_str(yytext); return VARIABLE; }
+
+[a-z0-9_\.]+ { yylval.string = store_str(yytext); return STRING; }
+
+[()\-\+\*/,=] { return yytext[0]; }
+
+[ \t]
+\n { line_no++; }
+
+%%
+
+int yywrap(void)
+{
+ return 1;
+}
+
+void yyerror(const char *fmt, ...)
+{
+ va_list ap;
+
+ printf("\n");
+ va_start(ap, fmt);
+ printf("ERROR: (%s) at line %d\n", yytext, line_no);
+ vprintf(fmt, ap);
+ printf("\n");
+ va_end(ap);
+}
diff --git a/tracecmd/sqlparser/sqlhist.y b/tracecmd/sqlparser/sqlhist.y
new file mode 100644
index 0000000..8a0004a
--- /dev/null
+++ b/tracecmd/sqlparser/sqlhist.y
@@ -0,0 +1,175 @@
+%{
+/* SPDX-License-Identifier: LGPL-2.0
+ *
+ * Copyright (C) 2020 VMware Inc, Steven Rostedt <rostedt@goodmis.org>
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sqlhist.h"
+
+extern int yylex(void);
+extern void yyerror(char *fmt, ...);
+
+%}
+
+%union {
+ int s32;
+ char *string;
+ void *expr;
+}
+
+%token AS SELECT FROM JOIN ON WHERE
+%token <string> STRING VARIABLE
+
+%left '+' '-'
+%left '*' '/'
+
+%type <string> name field label
+%type <string> selection_list table_exp selection_item
+%type <string> from_clause select_statement event_map
+%type <string> where_clause
+
+%type <expr> selection_expr item named_field join_clause
+
+%%
+
+start:
+ select_statement { table_end(NULL); }
+ | select_name
+ | simple_select { simple_table_end(); }
+ ;
+
+select_name :
+ '(' select_statement ')' label
+ { table_end($4); add_label($4, "SELECT"); }
+ ;
+
+label : AS name { $$ = store_printf("%s", $2); }
+ | name
+ ;
+
+select : SELECT { table_start(); }
+ ;
+
+simple_select :
+ select selection_list from_clause
+ | select selection_list from_clause where_clause
+ ;
+
+select_statement :
+ select selection_list table_exp
+ {
+ $$ = store_printf("SELECT %s %s", $2, $3);
+ }
+ ;
+
+selection_list :
+ selection_item
+ | selection_list ',' selection_item
+ {
+ $$ = store_printf("%s, %s", $1, $3);
+ }
+ ;
+
+selection_item : selection_expr { $$ = store_str(show_expr($1)); add_selection($1); }
+ ;
+
+selection_expr :
+ selection_expr '+' selection_expr
+ {
+ $$ = add_plus($1, $3);
+ }
+ | selection_expr '-' selection_expr
+ {
+ $$ = add_minus($1, $3);
+ }
+ | selection_expr '*' selection_expr
+ {
+ $$ = add_mult($1, $3);
+ }
+ | selection_expr '/' selection_expr
+ {
+ $$ = add_divid($1, $3);
+ }
+ | item
+ | '(' selection_expr ')' { $$ = $2; }
+ | '(' selection_expr ')' label
+ {
+ add_expr($4, $2);
+ $$ = $2;
+ }
+ ;
+
+item :
+ named_field
+ | field { $$ = add_field($1, NULL); }
+ ;
+
+field :
+ STRING
+ | VARIABLE
+ ;
+
+named_field :
+ field label { $$ = add_field($1, $2); }
+ ;
+
+name :
+ STRING
+ ;
+
+event_map :
+ from_clause join_clause on_clause { $$ = store_printf("%s TO %s", $1, show_expr($2)); }
+ ;
+
+where_clause :
+ WHERE item { $$ = store_printf(" WHERE %s", show_expr($2)); }
+ ;
+
+table_exp :
+ event_map
+ | event_map where_clause
+ ;
+
+from_clause :
+ FROM item
+ {
+ add_from($2);
+ $$ = store_printf("FROM %s", show_expr($2));
+ }
+/*
+ * Select from a from clause confuses the variable parsing.
+ * disable it for now.
+
+ | FROM '(' select_statement ')' label
+ {
+ from_table_end($5);
+ $$ = store_printf("FROM (%s) AS %s", $3, $5);
+ }
+*/
+ ;
+
+join_clause :
+ JOIN item { add_to($2); $$ = $2; }
+ ;
+
+on_clause :
+ ON match_clause
+ ;
+
+match :
+ item '=' item { add_match(show_expr($1), show_expr($3)); }
+ ;
+
+match_clause :
+ match
+ | match_clause ',' match
+ ;
+
+%%
+
+
diff --git a/tracecmd/trace-record.c b/tracecmd/trace-record.c
index 3e0d066..28daf41 100644
--- a/tracecmd/trace-record.c
+++ b/tracecmd/trace-record.c
@@ -43,6 +43,7 @@
#include "version.h"
#include "trace-local.h"
#include "trace-msg.h"
+#include "sqlhist-api.h"
#define _STR(x) #x
#define STR(x) _STR(x)
@@ -223,6 +224,7 @@ struct common_record_context {
int total_disable;
int disable;
int events;
+ int auto_triggers;
int global;
int filtered;
int date;
@@ -2069,6 +2071,51 @@ static int clear_trigger(const char *file)
return ret;
}
+static void clear_synthetic_events(void)
+{
+ struct sqlhist_synth_event *sevent;
+ struct buffer_instance *instance;
+ char *config;
+
+ for_all_instances(instance) {
+ if (is_guest(instance) || !instance->synth_events)
+ continue;
+ for (sevent = instance->synth_events; sevent; sevent = sevent->next) {
+ if (asprintf(&config, "!%s", sevent->config) < 0)
+ continue;
+ tracefs_instance_file_append(NULL,
+ "synthetic_events",
+ config);
+ free(config);
+ }
+ sqlhist_synth_event_free(instance->synth_events);
+ instance->synth_events = NULL;
+ }
+}
+
+static void clear_auto_triggers(void)
+{
+ struct buffer_instance *instance;
+ struct sqlhist_trigger *trigger;
+ char file[PATH_MAX];
+ char *config;
+
+ for_all_instances(instance) {
+ if (is_guest(instance) || !instance->auto_triggers)
+ continue;
+ for (trigger = instance->auto_triggers; trigger; trigger = trigger->next) {
+ if (asprintf(&config, "!%s", trigger->config) < 0)
+ continue;
+ snprintf(file, PATH_MAX, "events/%s/%s/trigger",
+ trigger->system, trigger->event);
+ tracefs_instance_file_append(instance->tracefs, file, config);
+ free(config);
+ }
+ sqlhist_trigger_free(instance->auto_triggers);
+ instance->auto_triggers = NULL;
+ }
+}
+
static void clear_func_filter(const char *file)
{
char filter[BUFSIZ];
@@ -2568,6 +2615,45 @@ static void set_mask(struct buffer_instance *instance)
instance->cpumask = NULL;
}
+static void set_synth_events(struct buffer_instance *instance)
+{
+ struct sqlhist_synth_event *sevent;
+
+ if (is_guest(instance))
+ return;
+
+ for (sevent = instance->synth_events; sevent; sevent = sevent->next) {
+ pr_stat("Synthetic event %s: %s\n", sevent->name, sevent->config);
+ if (tracefs_instance_file_append(NULL, "synthetic_events", sevent->config) < 0)
+ die("Failed to set synthetic event %s", sevent->config);
+ }
+}
+
+static void set_auto_triggers(struct buffer_instance *instance)
+{
+ struct sqlhist_trigger *trigger;
+ char file[PATH_MAX];
+
+ if (is_guest(instance))
+ return;
+
+ for (trigger = instance->auto_triggers; trigger; trigger = trigger->next) {
+ pr_stat("Trigger %s/%s: %s\n", trigger->system,
+ trigger->event, trigger->config);
+ snprintf(file, PATH_MAX, "events/%s/%s/trigger",
+ trigger->system, trigger->event);
+ if (tracefs_instance_file_write(instance->tracefs, file, trigger->config) < 0) {
+ char *err_log = NULL;
+
+ err_log = tracefs_instance_file_read(instance->tracefs,
+ "error_log", NULL);
+ die("Failed to set trigger %s:\n\t%s\nerror:\n\t%s",
+ file, trigger->config,
+ err_log ? err_log : "N/A");
+ }
+ }
+}
+
static void enable_events(struct buffer_instance *instance)
{
struct event_list *event;
@@ -4813,7 +4899,7 @@ static void check_function_plugin(void)
static int __check_doing_something(struct buffer_instance *instance)
{
return is_guest(instance) || (instance->flags & BUFFER_FL_PROFILE) ||
- instance->plugin || instance->events;
+ instance->plugin || instance->events || instance->synth_events;
}
static void check_doing_something(void)
@@ -5227,6 +5313,7 @@ void init_top_instance(void)
}
enum {
+ OPT_sql = 242,
OPT_user = 243,
OPT_procmap = 244,
OPT_quiet = 245,
@@ -5529,13 +5616,14 @@ static void parse_record_options(int argc,
{"proc-map", no_argument, NULL, OPT_procmap},
{"user", required_argument, NULL, OPT_user},
{"module", required_argument, NULL, OPT_module},
+ {"sql", required_argument, NULL, OPT_sql},
{NULL, 0, NULL, 0}
};
if (IS_EXTRACT(ctx))
opts = "+haf:Fp:co:O:sr:g:l:n:P:N:tb:B:ksiT";
else
- opts = "+hae:f:FA:p:cC:dDGo:O:s:r:vg:l:n:P:N:tb:R:B:ksSiTm:M:H:q";
+ opts = "+hae:f:FA:p:cC:dDGo:O:s:r:vg:l:n:P:N:tb:R:B:ksSiTm:M:H:qV";
c = getopt_long (argc-1, argv+1, opts, long_options, &option_index);
if (c == -1)
break;
@@ -5799,6 +5887,9 @@ static void parse_record_options(int argc,
case 'i':
ignore_event_not_found = 1;
break;
+ case 'V':
+ show_status = 1;
+ break;
case OPT_user:
ctx->user = strdup(optarg);
if (!ctx->user)
@@ -5870,6 +5961,14 @@ static void parse_record_options(int argc,
case 'q':
quiet = true;
break;
+ case OPT_sql:
+ ctx->auto_triggers = 1;
+ ret = sqlhist_parse(optarg, strlen(optarg) + 1,
+ &ctx->instance->auto_triggers,
+ &ctx->instance->synth_events);
+ if (ret < 0)
+ die("Failed to parse sql argument");
+ break;
default:
usage(argv);
}
@@ -5947,6 +6046,8 @@ static void finalize_record_trace(struct common_record_context *ctx)
update_reset_triggers();
if (clear_function_filters)
clear_func_filters();
+ clear_auto_triggers();
+ clear_synthetic_events();
set_plugin("nop");
@@ -6021,6 +6122,11 @@ static void record_trace(int argc, char **argv,
make_instances();
+ if (ctx->auto_triggers) {
+ for_all_instances(instance)
+ set_synth_events(instance);
+ }
+
if (ctx->events)
expand_event_list();
@@ -6048,6 +6154,10 @@ static void record_trace(int argc, char **argv,
enable_events(instance);
}
+ if (ctx->auto_triggers) {
+ for_all_instances(instance)
+ set_auto_triggers(instance);
+ }
set_saved_cmdlines_size(ctx);
set_buffer_size();
update_plugins(type);
diff --git a/tracecmd/trace-usage.c b/tracecmd/trace-usage.c
index 502a410..ba196ec 100644
--- a/tracecmd/trace-usage.c
+++ b/tracecmd/trace-usage.c
@@ -60,6 +60,8 @@ static struct usage_help usage_help[] = {
" --no-filter include trace-cmd threads in the trace\n"
" --proc-map save the traced processes address map into the trace.dat file\n"
" --user execute the specified [command ...] as given user\n"
+ " --sql generate necessary ftrace syntetic events and triggers, based on the given sql query\n"
+ " -V dump ftrace configuration, auto generated by the --sql option"
},
{
"start",
--
2.24.1
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