[Qemu-devel] [PATCH v3 6/6] monitor: adding start_stats to monitor

[vandersonmr]

adding the option to start collecting the tb
statistics later using the start_stats command.

Signed-off-by: vandersonmr <address@hidden>
---
 hmp-commands.hx | 15 +++++++++++++++
 monitor/misc.c  | 15 +++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index bfa5681dd2..616b9f7388 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1885,6 +1885,21 @@ STEXI
 @findex qemu-io
 Executes a qemu-io command on the given block device.
 
+ETEXI
+
+    {
+        .name       = "start_stats",
+        .args_type  = "",
+        .params     = "",
+        .help       = "(re)start recording tb statistics",
+        .cmd        = hmp_tbstats_start,
+    },
+
+STEXI
+@item start_stats
+@findex
+(Re)start recording tb statistics
+
 ETEXI
 
     {
diff --git a/monitor/misc.c b/monitor/misc.c
index 1fb4d75871..d39a048fd7 100644
--- a/monitor/misc.c
+++ b/monitor/misc.c
@@ -469,6 +469,21 @@ static void hmp_info_jit(Monitor *mon, const QDict *qdict)
     dump_drift_info();
 }
 
+static void hmp_tbstats_start(Monitor *mon, const QDict *qdict)
+{
+    if (!tcg_enabled()) {
+        error_report("TB information is only available with accel=tcg");
+        return;
+    }
+    if (qemu_loglevel_mask(CPU_LOG_HOT_TBS)) {
+        error_report("TB information already being recorded");
+        return;
+    }
+    qht_init(&tb_ctx.tb_stats, tb_stats_cmp, CODE_GEN_HTABLE_SIZE,
+                QHT_MODE_AUTO_RESIZE);
+    qemu_set_log(qemu_loglevel | CPU_LOG_HOT_TBS);
+}
+
 static void hmp_info_tbs(Monitor *mon, const QDict *qdict)
 {
     int n;
-- 
2.22.0