[Qemu-devel] [PATCH v6 10/10] linux-user: dumping hot TBs at the end of the execution

[vandersonmr <vandersonmr2@gmail.com>]

dumps, in linux-user mode, the hottest TBs if -d tb_stats 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: vandersonmr <vandersonmr2@gmail.com>
---
 linux-user/exit.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/linux-user/exit.c b/linux-user/exit.c
index bdda720553..7226104959 100644
--- a/linux-user/exit.c
+++ b/linux-user/exit.c
@@ -28,6 +28,10 @@ extern void __gcov_dump(void);
 
 void preexit_cleanup(CPUArchState *env, int code)
 {
+    if (tb_stats_collection_enabled()) {
+        dump_tbs_info(max_num_hot_tbs_to_dump, SORT_BY_HOTNESS, false);
+    }
+
 #ifdef TARGET_GPROF
         _mcleanup();
 #endif
-- 
2.22.0