[PATCH v9 10/13] tb-stats: dump hot TBs at the end of the execution

["Alex Bennée" <alex.bennee@linaro.org>]

From: "Vanderson M. do Rosario" <vandersonmr2@gmail.com>

Dump the hottest TBs if -d tb_stats,dump_limit=N is used.

Example of output for the 3 hottest TBs:

TB id:1 | phys:0x34d54 virt:0x0000000000034d54 flags:0x0000f0
        | exec:4828932/0 guest inst cov:16.38%
        | trans:1 ints: g:3 op:82 op_opt:34 spills:3
        | h/g (host bytes / guest insts): 90.666664
        | time to gen at 2.4GHz => code:3150.83(ns) IR:712.08(ns)
        | targets: 0x0000000000034d5e (id:11), 0x0000000000034d0d (id:2)

TB id:2 | phys:0x34d0d virt:0x0000000000034d0d flags:0x0000f0
        | exec:4825842/0 guest inst cov:21.82%
        | trans:1 ints: g:4 op:80 op_opt:38 spills:2
        | h/g (host bytes / guest insts): 84.000000
        | time to gen at 2.4GHz => code:3362.92(ns) IR:793.75(ns)
        | targets: 0x0000000000034d19 (id:12), 0x0000000000034d54 (id:1)

TB id:3 | phys:0xec1c1 virt:0x00000000000ec1c1 flags:0x0000b0
        | exec:872032/0 guest inst cov:1.97%
        | trans:1 ints: g:2 op:56 op_opt:26 spills:1
        | h/g (host bytes / guest insts): 68.000000
        | time to gen at 2.4GHz => code:1692.08(ns) IR:473.75(ns)
        | targets: 0x00000000000ec1c5 (id:4), 0x00000000000ec1cb (id:13)

Signed-off-by: Vanderson M. do Rosario <vandersonmr2@gmail.com>
Message-Id: <20190829173437.5926-12-vandersonmr2@gmail.com>
[AJB: fix authorship, ad softmmu support]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

---
AJB:
  - move vars into tb_stats.c
  - support softmmu as well
---
 accel/tcg/tb-stats.c          | 21 +++++++++++++++++++++
 include/exec/tb-stats-dump.h  | 21 +++++++++++++++++++++
 include/exec/tb-stats-flags.h |  1 +
 linux-user/exit.c             |  2 ++
 stubs/tb-stats.c              |  5 +++++
 util/log.c                    |  4 ++--
 vl.c                          |  2 ++
 7 files changed, 54 insertions(+), 2 deletions(-)
 create mode 100644 include/exec/tb-stats-dump.h

diff --git a/accel/tcg/tb-stats.c b/accel/tcg/tb-stats.c
index 3c1cc8cd06..60a9ee4b9c 100644
--- a/accel/tcg/tb-stats.c
+++ b/accel/tcg/tb-stats.c
@@ -15,6 +15,7 @@
 #include "qemu/qemu-print.h"
 
 #include "exec/tb-stats.h"
+#include "exec/tb-stats-dump.h"
 
 /* TBStatistic collection controls */
 enum TBStatsStatus {
@@ -26,6 +27,7 @@ enum TBStatsStatus {
 
 static enum TBStatsStatus tcg_collect_tb_stats;
 static uint32_t default_tbstats_flag;
+static int max_dump_tbs;
 /* only accessed in safe work */
 static GList *last_search;
 static int id = 1; /* display_id increment counter */
@@ -591,6 +593,20 @@ void dump_tb_info(int id, int log_mask, bool use_monitor)
 }
 
 
+/*
+ * Dump the final stats
+ */
+void tb_stats_dump(void)
+{
+    if (!tb_stats_collection_enabled()) {
+        return;
+    }
+
+    dump_tbs_info(max_dump_tbs, SORT_BY_HOTNESS, false);
+}
+
+/* TBStatistic collection controls */
+
 void enable_collect_tb_stats(void)
 {
     init_tb_stats_htable_if_not();
@@ -639,3 +655,8 @@ void set_default_tbstats_flag(uint32_t flags)
 {
     default_tbstats_flag = flags;
 }
+
+void set_tbstats_max_tbs(int max)
+{
+    max_dump_tbs = max;
+}
diff --git a/include/exec/tb-stats-dump.h b/include/exec/tb-stats-dump.h
new file mode 100644
index 0000000000..197c6148e9
--- /dev/null
+++ b/include/exec/tb-stats-dump.h
@@ -0,0 +1,21 @@
+/*
+ * TB Stats common dump functions across sysemu/linux-user
+ *
+ * Copyright (c) 2019 Linaro
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#ifndef _TB_STATS_DUMP_H_
+#define _TB_STATS_DUMP_H_
+
+/**
+ * tb_stats_dump: dump final tb_stats at end of execution
+ */
+#ifdef CONFIG_TCG
+void tb_stats_dump(void);
+#else
+static inline void tb_stats_dump(void) { /* do nothing */ };
+#endif
+
+#endif /* _TB_STATS_DUMP_H_ */
diff --git a/include/exec/tb-stats-flags.h b/include/exec/tb-stats-flags.h
index 252304d685..a5bf44f824 100644
--- a/include/exec/tb-stats-flags.h
+++ b/include/exec/tb-stats-flags.h
@@ -24,6 +24,7 @@ void pause_collect_tb_stats(void);
 bool tb_stats_collection_enabled(void);
 bool tb_stats_collection_paused(void);
 
+void set_tbstats_max_tbs(int max);
 uint32_t get_default_tbstats_flag(void);
 void set_default_tbstats_flag(uint32_t);
 
diff --git a/linux-user/exit.c b/linux-user/exit.c
index bdda720553..c00700bb96 100644
--- a/linux-user/exit.c
+++ b/linux-user/exit.c
@@ -21,6 +21,7 @@
 #ifdef TARGET_GPROF
 #include <sys/gmon.h>
 #endif
+#include "exec/tb-stats-dump.h"
 
 #ifdef CONFIG_GCOV
 extern void __gcov_dump(void);
@@ -35,4 +36,5 @@ void preexit_cleanup(CPUArchState *env, int code)
         __gcov_dump();
 #endif
         gdb_exit(env, code);
+        tb_stats_dump();
 }
diff --git a/stubs/tb-stats.c b/stubs/tb-stats.c
index d212c2a1fa..a3e1406b88 100644
--- a/stubs/tb-stats.c
+++ b/stubs/tb-stats.c
@@ -21,6 +21,11 @@ bool tb_stats_collection_enabled(void)
     return false;
 }
 
+void set_tbstats_max_tbs(int max)
+{
+    return;
+}
+
 void set_default_tbstats_flag(uint32_t flags)
 {
     return;
diff --git a/util/log.c b/util/log.c
index fa78e2bca9..b6e4f71c1f 100644
--- a/util/log.c
+++ b/util/log.c
@@ -32,7 +32,6 @@ FILE *qemu_logfile;
 int qemu_loglevel;
 static int log_append = 0;
 static GArray *debug_regions;
-int32_t max_num_hot_tbs_to_dump;
 static bool to_monitor;
 bool to_string;
 
@@ -337,7 +336,8 @@ int qemu_str_to_log_mask(const char *str)
             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);
+            int hot_tbs = atoi((*tmp) + 11);
+            set_tbstats_max_tbs(hot_tbs);
         } else if (tb_stats_collection_enabled() &&
                    g_str_has_prefix(*tmp, "level=")) {
             uint32_t flags = 0;
diff --git a/vl.c b/vl.c
index 781fddaf18..9ceb401007 100644
--- a/vl.c
+++ b/vl.c
@@ -35,6 +35,7 @@
 #include "sysemu/runstate.h"
 #include "sysemu/seccomp.h"
 #include "sysemu/tcg.h"
+#include "exec/tb-stats-dump.h"
 
 #ifdef CONFIG_SDL
 #if defined(__APPLE__) || defined(main)
@@ -4514,6 +4515,7 @@ int main(int argc, char **argv, char **envp)
     /* No more vcpu or device emulation activity beyond this point */
     vm_shutdown();
 
+    tb_stats_dump();
     job_cancel_sync_all();
     bdrv_close_all();
 
-- 
2.20.1