[Qemu-devel] [PATCH v4 5/7] log: adding -d tb_stats to control tbstats

[vandersonmr <vandersonmr2@gmail.com>]

Adding -d tb_stats:[limit:[all|jit|exec]] to control TBStatistics
collection. "limit" is used to limit the number of TBStats in the
linux-user dump. [all|jit|exec] control the profilling level used
by the TBStats: all, only jit stats or only execution count stats.

Signed-off-by: Vanderson M. do Rosario <vandersonmr2@gmail.com>
---
 include/qemu/log.h |  1 +
 util/log.c         | 34 ++++++++++++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/include/qemu/log.h b/include/qemu/log.h
index 8cdfc268ca..93642603e5 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/util/log.c b/util/log.c
index f81653d712..8109d19afb 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 +274,8 @@ 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[:limit:(all,jit,exec)]",
+      "show TBs statistics (until given a limit) ordered by their hotness.\n" },
     { 0, NULL, NULL },
 };
 
@@ -294,6 +297,37 @@ 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")) {
+            if (g_str_has_prefix(*tmp, "tb_stats:") && (*tmp)[9] != '\0') {
+
+                if (!g_ascii_isdigit(*((*tmp) + 9))) {
+                    fprintf(stderr,
+                            "should be a number follow by [all|jit|exec], as tb_stats:10:all\n");
+                    exit(1);
+                }
+                /* get limit */
+                max_num_hot_tbs_to_dump = atoi((*tmp) + 9);
+
+                /* get profilling level */
+                char *s = (*tmp) + 9;
+                while (*s != '\0') {
+                    if (*s++ == ':') {
+                        break;
+                    }
+                }
+                if (g_str_equal(s, "jit") == 0) {
+                    set_default_tbstats_flag(TB_JIT_STATS);
+                } else if (g_str_equal(s, "exec") == 0) {
+                    set_default_tbstats_flag(TB_EXEC_STATS);
+                } else {
+                    set_default_tbstats_flag(TB_JIT_STATS | TB_EXEC_STATS);
+                }
+            } else {
+                set_default_tbstats_flag(TB_JIT_STATS | TB_EXEC_STATS);
+            }
+
+            mask |= CPU_LOG_TB_STATS;
+            enable_collect_tb_stats();
         } else {
             for (item = qemu_log_items; item->mask != 0; item++) {
                 if (g_str_equal(*tmp, item->name)) {
-- 
2.22.0