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[Qemu-devel] [PATCH v2 2/4] Adding an optional tb execution counter.
From: |
vandersonmr |
Subject: |
[Qemu-devel] [PATCH v2 2/4] Adding an optional tb execution counter. |
Date: |
Mon, 24 Jun 2019 02:54:40 -0300 |
We collect the number of times each TB is executed
and store it in the its TBStatistics.
We also count the number of times the execution counter overflows.
Signed-off-by: Vanderson M. do Rosario <address@hidden>
---
accel/tcg/tcg-runtime.c | 10 ++++++++++
accel/tcg/tcg-runtime.h | 2 ++
accel/tcg/translator.c | 1 +
include/exec/gen-icount.h | 9 +++++++++
4 files changed, 22 insertions(+)
diff --git a/accel/tcg/tcg-runtime.c b/accel/tcg/tcg-runtime.c
index 8a1e408e31..9888a7fce8 100644
--- a/accel/tcg/tcg-runtime.c
+++ b/accel/tcg/tcg-runtime.c
@@ -167,3 +167,13 @@ void HELPER(exit_atomic)(CPUArchState *env)
{
cpu_loop_exit_atomic(env_cpu(env), GETPC());
}
+
+void HELPER(inc_exec_freq)(void *ptr)
+{
+ TranslationBlock *tb = (TranslationBlock*) ptr;
+ // if overflows, then reset the execution counter and increment the
overflow counter
+ if (atomic_cmpxchg(&tb->tb_stats->exec_count, 0xFFFFFFFF, 0) ==
0xFFFFFFFF) {
+ atomic_inc(&tb->tb_stats->exec_count_overflows);
+ }
+ atomic_inc(&tb->tb_stats->exec_count);
+}
diff --git a/accel/tcg/tcg-runtime.h b/accel/tcg/tcg-runtime.h
index 4fa61b49b4..bf0b75dbe8 100644
--- a/accel/tcg/tcg-runtime.h
+++ b/accel/tcg/tcg-runtime.h
@@ -28,6 +28,8 @@ DEF_HELPER_FLAGS_1(lookup_tb_ptr, TCG_CALL_NO_WG_SE, ptr, env)
DEF_HELPER_FLAGS_1(exit_atomic, TCG_CALL_NO_WG, noreturn, env)
+DEF_HELPER_FLAGS_1(inc_exec_freq, TCG_CALL_NO_RWG, void, ptr)
+
#ifdef CONFIG_SOFTMMU
DEF_HELPER_FLAGS_5(atomic_cmpxchgb, TCG_CALL_NO_WG,
diff --git a/accel/tcg/translator.c b/accel/tcg/translator.c
index 9226a348a3..cc06070e7e 100644
--- a/accel/tcg/translator.c
+++ b/accel/tcg/translator.c
@@ -54,6 +54,7 @@ void translator_loop(const TranslatorOps *ops,
DisasContextBase *db,
gen_tb_start(db->tb);
ops->tb_start(db, cpu);
tcg_debug_assert(db->is_jmp == DISAS_NEXT); /* no early exit */
+ gen_tb_exec_count(tb);
while (true) {
db->num_insns++;
diff --git a/include/exec/gen-icount.h b/include/exec/gen-icount.h
index f7669b6841..6d38b6e1fb 100644
--- a/include/exec/gen-icount.h
+++ b/include/exec/gen-icount.h
@@ -7,6 +7,15 @@
static TCGOp *icount_start_insn;
+static inline void gen_tb_exec_count(TranslationBlock *tb)
+{
+ if (qemu_loglevel_mask(CPU_LOG_HOT_TBS)) {
+ TCGv_ptr tb_ptr = tcg_const_ptr(tb);
+ gen_helper_inc_exec_freq(tb_ptr);
+ tcg_temp_free_ptr(tb_ptr);
+ }
+}
+
static inline void gen_tb_start(TranslationBlock *tb)
{
TCGv_i32 count, imm;
--
2.22.0
[Qemu-devel] [PATCH v2 2/4] Adding an optional tb execution counter.,
vandersonmr <=
[Qemu-devel] [PATCH v2 3/4] Introduce dump of hot TBs, vandersonmr, 2019/06/24
[Qemu-devel] [PATCH v2 4/4] adding -d hot_tbs:limit command line option, vandersonmr, 2019/06/24
Re: [Qemu-devel] [PATCH v2 0/4] dumping hot TBs, no-reply, 2019/06/24