[Qemu-devel] [PATCH v2 4/4] adding -d hot_tbs:limit command line option

[vandersonmr <vandersonmr2@gmail.com>]

add option to dump the N most hot TB blocks.
-d hot_tbs:N

Signed-off-by: vandersonmr <vandersonmr2@gmail.com>
---
 include/qemu/log-for-trace.h | 2 ++
 linux-user/exit.c            | 3 +++
 util/log.c                   | 9 +++++++++
 3 files changed, 14 insertions(+)

diff --git a/include/qemu/log-for-trace.h b/include/qemu/log-for-trace.h
index 2f0a5b080e..d65eb83037 100644
--- a/include/qemu/log-for-trace.h
+++ b/include/qemu/log-for-trace.h
@@ -21,6 +21,8 @@
 /* Private global variable, don't use */
 extern int qemu_loglevel;
 
+extern int32_t max_num_hot_tbs_to_dump;
+
 #define LOG_TRACE          (1 << 15)
 
 /* Returns true if a bit is set in the current loglevel mask */
diff --git a/linux-user/exit.c b/linux-user/exit.c
index bdda720553..08b86dfd61 100644
--- a/linux-user/exit.c
+++ b/linux-user/exit.c
@@ -28,6 +28,9 @@ extern void __gcov_dump(void);
 
 void preexit_cleanup(CPUArchState *env, int code)
 {
+    if (qemu_loglevel_mask(CPU_LOG_HOT_TBS)) {
+        tb_dump_exec_freq(max_num_hot_tbs_to_dump);
+    }
 #ifdef TARGET_GPROF
         _mcleanup();
 #endif
diff --git a/util/log.c b/util/log.c
index 1d1b33f7d9..e71c663143 100644
--- a/util/log.c
+++ b/util/log.c
@@ -30,6 +30,7 @@ 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 +274,9 @@ 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_HOT_TBS, "hot_tbs(:limit)",
+      "show TBs (until given a limit) ordered by their hotness.\n"
+      "(if no limit is given, show all)" },
     { 0, NULL, NULL },
 };
 
@@ -294,6 +298,11 @@ 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, "hot_tbs")) {
+            if (g_str_has_prefix(*tmp, "hot_tbs:") && (*tmp)[8] != '\0') {
+                max_num_hot_tbs_to_dump = atoi((*tmp) + 8);
+            }
+            mask |= CPU_LOG_HOT_TBS;
         } else {
             for (item = qemu_log_items; item->mask != 0; item++) {
                 if (g_str_equal(*tmp, item->name)) {
-- 
2.22.0