[v15,08/10] debug: add -d tb_stats to control TBStatistics

Commit Message

Wu, Fei June 7, 2023, 12:24 p.m. UTC

Capture TBS at startup instead of an explicit 'tb_stats start' command.

Signed-off-by: Vanderson M. do Rosario <[e-mail]>
Signed-off-by: Alex Bennée <[e-mail]>
Signed-off-by: Fei Wu <[e-mail]>
---
 include/exec/tb-stats-flags.h |  1 +
 include/qemu/log.h            |  1 +
 stubs/meson.build             |  1 +
 stubs/tb-stats.c              | 32 ++++++++++++++++++++++++++++++++
 util/log.c                    | 18 ++++++++++++++++++
 5 files changed, 53 insertions(+)
 create mode 100644 stubs/tb-stats.c

Patch

diff --git a/include/exec/tb-stats-flags.h b/include/exec/tb-stats-flags.h
index d8b844be99..936bd35707 100644
--- a/include/exec/tb-stats-flags.h
+++ b/include/exec/tb-stats-flags.h
@@ -14,6 +14,7 @@ 
 #define TB_NONE_STATS (0)  /* no stats */
 #define TB_EXEC_STATS (1 << 0)
 #define TB_JIT_STATS  (1 << 1)
+#define TB_ALL_STATS  (TB_EXEC_STATS | TB_JIT_STATS)
 
 /* TBStatistic collection controls */
 void enable_collect_tb_stats(void);
diff --git a/include/qemu/log.h b/include/qemu/log.h
index c5643d8dd5..6f3b8091cd 100644
--- a/include/qemu/log.h
+++ b/include/qemu/log.h
@@ -35,6 +35,7 @@  bool qemu_log_separate(void);
 /* LOG_STRACE is used for user-mode strace logging. */
 #define LOG_STRACE         (1 << 19)
 #define LOG_PER_THREAD     (1 << 20)
+#define CPU_LOG_TB_STATS   (1 << 21)
 
 /* Lock/unlock output. */
 
diff --git a/stubs/meson.build b/stubs/meson.build
index a56645e2f7..e926649d40 100644
--- a/stubs/meson.build
+++ b/stubs/meson.build
@@ -65,3 +65,4 @@  else
 endif
 stub_ss.add(files('semihost-all.c'))
 stub_ss.add(when: 'CONFIG_VFIO_USER_SERVER', if_false: files('vfio-user-obj.c'))
+stub_ss.add(files('tb-stats.c'))
diff --git a/stubs/tb-stats.c b/stubs/tb-stats.c
new file mode 100644
index 0000000000..38ee12313e
--- /dev/null
+++ b/stubs/tb-stats.c
@@ -0,0 +1,32 @@ 
+/*
+ * TB Stats Stubs
+ *
+ * Copyright (c) 2019
+ * Written by Alex Bennée <[e-mail]>
+ *
+ * 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;
+}
+
+void disable_collect_tb_stats(void)
+{
+    return;
+}
+
+bool tb_stats_collection_enabled(void)
+{
+    return false;
+}
+
+void set_tbstats_flag(uint32_t flag)
+{
+    return;
+}
diff --git a/util/log.c b/util/log.c
index 53b4f6c58e..419f02c380 100644
--- a/util/log.c
+++ b/util/log.c
@@ -27,6 +27,7 @@ 
 #include "qemu/thread.h"
 #include "qemu/lockable.h"
 #include "qemu/rcu.h"
+#include "exec/tb-stats-flags.h"
 #ifdef CONFIG_LINUX
 #include <sys/syscall.h>
 #endif
@@ -495,6 +496,8 @@  const QEMULogItem qemu_log_items[] = {
       "log every user-mode syscall, its input, and its result" },
     { LOG_PER_THREAD, "tid",
       "open a separate log file per thread; filename must contain '%d'" },
+    { CPU_LOG_TB_STATS, "tb_stats_{all,jit,exec}",
+      "enable collection of TBs statistics at startup" },
     { 0, NULL, NULL },
 };
 
@@ -516,6 +519,21 @@  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_")) {
+            char *p = *tmp + 9;
+            uint32_t flag = TB_NONE_STATS;
+            if (g_str_has_prefix(p, "all")) {
+                flag = TB_ALL_STATS;
+            } else if (g_str_has_prefix(p, "jit")) {
+                flag = TB_JIT_STATS;
+            } else if (g_str_has_prefix(p, "exec")) {
+                flag = TB_EXEC_STATS;
+            }
+            if (flag != TB_NONE_STATS) {
+                mask |= CPU_LOG_TB_STATS;
+                set_tbstats_flag(flag);
+                enable_collect_tb_stats();
+            }
         } else {
             for (item = qemu_log_items; item->mask != 0; item++) {
                 if (g_str_equal(*tmp, item->name)) {