[PATCH v9 06/13] debug: add -d tb_stats to control TBStatistics collection:

[Alex Bennée]

From: "Vanderson M. do Rosario" <address@hidden>

 -d tb_stats[[,level=(+all+jit+exec+time)][,dump_limit=<number>]]

"dump_limit" is used to limit the number of dumped TBStats in
linux-user mode.

[all+jit+exec+time] control the profilling level used
by the TBStats. Can be used as follow:

-d tb_stats
-d tb_stats,level=jit+time
-d tb_stats,dump_limit=15
...

Signed-off-by: Vanderson M. do Rosario <address@hidden>
Message-Id: <address@hidden>
[AJB: fix authorship, reword title]
Signed-off-by: Alex Bennée <address@hidden>

---
AJB:
  - reword title
  - add stubs for enabling
  - move things across to tb-stats-flags.h
---
 accel/tcg/tb-stats.c          |  5 +++++
 include/exec/gen-icount.h     |  1 +
 include/exec/tb-stats-flags.h | 29 +++++++++++++++++++++++++++++
 include/exec/tb-stats.h       | 16 +++-------------
 include/qemu/log.h            |  1 +
 stubs/Makefile.objs           |  1 +
 stubs/tb-stats.c              | 27 +++++++++++++++++++++++++++
 util/log.c                    | 35 +++++++++++++++++++++++++++++++++++
 8 files changed, 102 insertions(+), 13 deletions(-)
 create mode 100644 include/exec/tb-stats-flags.h
 create mode 100644 stubs/tb-stats.c

diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c
index f431159fd2..1c66e03979 100644
--- a/accel/tcg/tb-stats.c
+++ b/accel/tcg/tb-stats.c
@@ -193,3 +193,8 @@ uint32_t get_default_tbstats_flag(void)
 {
     return default_tbstats_flag;
 }
+
+void set_default_tbstats_flag(uint32_t flags)
+{
+    default_tbstats_flag = flags;
+}
diff --git a/include/exec/gen-icount.h b/include/exec/gen-icount.h
index be006383b9..3987adfb0e 100644
--- a/include/exec/gen-icount.h
+++ b/include/exec/gen-icount.h
@@ -2,6 +2,7 @@
 #define GEN_ICOUNT_H
 
 #include "qemu/timer.h"
+#include "tb-stats-flags.h"
 
 /* Helpers for instruction counting code generation.  */
 
diff --git a/include/exec/tb-stats-flags.h b/include/exec/tb-stats-flags.h
new file mode 100644
index 0000000000..8455073048
--- /dev/null
+++ b/include/exec/tb-stats-flags.h
@@ -0,0 +1,29 @@
+/*
+ * QEMU System Emulator, Code Quality Monitor System
+ *
+ * We define the flags and control bits here to avoid complications of
+ * including TCG/CPU information in common code.
+ *
+ * Copyright (c) 2019 Vanderson M. do Rosario <address@hidden>
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+#ifndef TB_STATS_FLAGS
+#define TB_STATS_FLAGS
+
+#define TB_NOTHING    (1 << 0)
+#define TB_EXEC_STATS (1 << 1)
+#define TB_JIT_STATS  (1 << 2)
+#define TB_JIT_TIME   (1 << 3)
+
+/* TBStatistic collection controls */
+void enable_collect_tb_stats(void);
+void disable_collect_tb_stats(void);
+void pause_collect_tb_stats(void);
+bool tb_stats_collection_enabled(void);
+bool tb_stats_collection_paused(void);
+
+uint32_t get_default_tbstats_flag(void);
+void set_default_tbstats_flag(uint32_t);
+
+#endif
diff --git a/include/exec/tb-stats.h b/include/exec/tb-stats.h
index a142972960..019d316f5c 100644
--- a/include/exec/tb-stats.h
+++ b/include/exec/tb-stats.h
@@ -30,6 +30,8 @@
 #include "exec/tb-context.h"
 #include "tcg.h"
 
+#include "exec/tb-stats-flags.h"
+
 #define tb_stats_enabled(tb, JIT_STATS) \
     (tb && tb->tb_stats && (tb->tb_stats->stats_enabled & JIT_STATS))
 
@@ -108,21 +110,9 @@ bool tb_stats_cmp(const void *ap, const void *bp);
 
 void dump_jit_exec_time_info(uint64_t dev_time);
 
+void set_tbstats_flags(uint32_t flags);
 void init_tb_stats_htable_if_not(void);
 
 void dump_jit_profile_info(TCGProfile *s);
 
-#define TB_NOTHING    (1 << 0)
-#define TB_EXEC_STATS (1 << 1)
-#define TB_JIT_STATS  (1 << 2)
-#define TB_JIT_TIME   (1 << 3)
-
-void enable_collect_tb_stats(void);
-void disable_collect_tb_stats(void);
-void pause_collect_tb_stats(void);
-bool tb_stats_collection_enabled(void);
-bool tb_stats_collection_paused(void);
-
-uint32_t get_default_tbstats_flag(void);
-
 #endif
diff --git a/include/qemu/log.h b/include/qemu/log.h
index b097a6cae1..a8d1997cde 100644
--- a/include/qemu/log.h
+++ b/include/qemu/log.h
@@ -45,6 +45,7 @@ static inline bool qemu_log_separate(void)
 /* LOG_TRACE (1 << 15) is defined in log-for-trace.h */
 #define CPU_LOG_TB_OP_IND  (1 << 16)
 #define CPU_LOG_TB_FPU     (1 << 17)
+#define CPU_LOG_TB_STATS   (1 << 18)
 
 /* Lock output for a series of related logs.  Since this is not needed
  * for a single qemu_log / qemu_log_mask / qemu_log_mask_and_addr, we
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index 9c7393b08c..1c5cd05147 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -41,3 +41,4 @@ stub-obj-y += ram-block.o
 stub-obj-y += ramfb.o
 stub-obj-y += fw_cfg.o
 stub-obj-$(CONFIG_SOFTMMU) += semihost.o
+stub-obj-$(CONFIG_TCG) += tb-stats.o
diff --git a/stubs/tb-stats.c b/stubs/tb-stats.c
new file mode 100644
index 0000000000..d212c2a1fa
--- /dev/null
+++ b/stubs/tb-stats.c
@@ -0,0 +1,27 @@
+/*
+ * TB Stats Stubs
+ *
+ * Copyright (c) 2019
+ * Written by Alex Bennée <address@hidden>
+ *
+ * This code is licensed under the GNU GPL v2, or later.
+ */
+
+
+#include "qemu/osdep.h"
+#include "exec/tb-stats-flags.h"
+
+void enable_collect_tb_stats(void)
+{
+    return;
+}
+
+bool tb_stats_collection_enabled(void)
+{
+    return false;
+}
+
+void set_default_tbstats_flag(uint32_t flags)
+{
+    return;
+}
diff --git a/util/log.c b/util/log.c
index 1d1b33f7d9..86bd691967 100644
--- a/util/log.c
+++ b/util/log.c
@@ -19,17 +19,20 @@
 
 #include "qemu/osdep.h"
 #include "qemu/log.h"
+#include "qemu/qemu-print.h"
 #include "qemu/range.h"
 #include "qemu/error-report.h"
 #include "qapi/error.h"
 #include "qemu/cutils.h"
 #include "trace/control.h"
+#include "exec/tb-stats-flags.h"
 
 static char *logfilename;
 FILE *qemu_logfile;
 int qemu_loglevel;
 static int log_append = 0;
 static GArray *debug_regions;
+int32_t max_num_hot_tbs_to_dump;
 
 /* Return the number of characters emitted.  */
 int qemu_log(const char *fmt, ...)
@@ -273,6 +276,9 @@ const QEMULogItem qemu_log_items[] = {
     { CPU_LOG_TB_NOCHAIN, "nochain",
       "do not chain compiled TBs so that \"exec\" and \"cpu\" show\n"
       "complete traces" },
+    { CPU_LOG_TB_STATS, 
"tb_stats[[,level=(+all+jit+exec+time)][,dump_limit=<number>]]",
+      "enable collection of TBs statistics"
+      "(and dump until given a limit if in user mode).\n" },
     { 0, NULL, NULL },
 };
 
@@ -294,6 +300,35 @@ int qemu_str_to_log_mask(const char *str)
             trace_enable_events((*tmp) + 6);
             mask |= LOG_TRACE;
 #endif
+        } else if (g_str_has_prefix(*tmp, "tb_stats")) {
+            mask |= CPU_LOG_TB_STATS;
+            set_default_tbstats_flag(TB_JIT_STATS | TB_EXEC_STATS | 
TB_JIT_TIME);
+            enable_collect_tb_stats();
+        } else if (tb_stats_collection_enabled() &&
+                   g_str_has_prefix(*tmp, "dump_limit=")) {
+            max_num_hot_tbs_to_dump = atoi((*tmp) + 11);
+        } else if (tb_stats_collection_enabled() &&
+                   g_str_has_prefix(*tmp, "level=")) {
+            uint32_t flags = 0;
+            char **level_parts = g_strsplit(*tmp + 6, "+", 0);
+            char **level_tmp;
+            for (level_tmp = level_parts; level_tmp && *level_tmp; 
level_tmp++) {
+                if (g_str_equal(*level_tmp, "jit")) {
+                    flags |= TB_JIT_STATS;
+                } else if (g_str_equal(*level_tmp, "exec")) {
+                    flags |= TB_EXEC_STATS;
+                } else if (g_str_equal(*level_tmp, "time")) {
+                    flags |= TB_JIT_TIME;
+                } else if (g_str_equal(*level_tmp, "all")) {
+                    flags |= TB_JIT_STATS | TB_EXEC_STATS | TB_JIT_TIME;
+                } else {
+                    /* FIXME: set errp */
+                    fprintf(stderr, "no option level=%s, valid options are:"
+                            "all, jit, exec or/and time\n", *level_tmp);
+                    exit(1);
+                }
+                set_default_tbstats_flag(flags);
+            }
         } else {
             for (item = qemu_log_items; item->mask != 0; item++) {
                 if (g_str_equal(*tmp, item->name)) {
-- 
2.20.1