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Re: [PATCH v2 12/12] accel/tcg: Avoid unnecessary call overhead from qem


From: Pierrick Bouvier
Subject: Re: [PATCH v2 12/12] accel/tcg: Avoid unnecessary call overhead from qemu_plugin_vcpu_mem_cb
Date: Thu, 20 Jun 2024 11:40:00 -0700
User-agent: Mozilla Thunderbird

On 6/20/24 08:22, Alex Bennée wrote:
From: Max Chou <max.chou@sifive.com>

If there are not any QEMU plugin memory callback functions, checking
before calling the qemu_plugin_vcpu_mem_cb function can reduce the
function call overhead.

Signed-off-by: Max Chou <max.chou@sifive.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Frank Chang <frank.chang@sifive.com>
Message-Id: <20240613175122.1299212-2-max.chou@sifive.com>
---
  accel/tcg/ldst_common.c.inc | 8 ++++++--
  1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/accel/tcg/ldst_common.c.inc b/accel/tcg/ldst_common.c.inc
index c82048e377..87ceb95487 100644
--- a/accel/tcg/ldst_common.c.inc
+++ b/accel/tcg/ldst_common.c.inc
@@ -125,7 +125,9 @@ void helper_st_i128(CPUArchState *env, uint64_t addr, 
Int128 val, MemOpIdx oi)
static void plugin_load_cb(CPUArchState *env, abi_ptr addr, MemOpIdx oi)
  {
-    qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_R);
+    if (cpu_plugin_mem_cbs_enabled(env_cpu(env))) {
+        qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_R);
+    }
  }
uint8_t cpu_ldb_mmu(CPUArchState *env, abi_ptr addr, MemOpIdx oi, uintptr_t ra)
@@ -188,7 +190,9 @@ Int128 cpu_ld16_mmu(CPUArchState *env, abi_ptr addr,
static void plugin_store_cb(CPUArchState *env, abi_ptr addr, MemOpIdx oi)
  {
-    qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W);
+    if (cpu_plugin_mem_cbs_enabled(env_cpu(env))) {
+        qemu_plugin_vcpu_mem_cb(env_cpu(env), addr, oi, QEMU_PLUGIN_MEM_W);
+    }
  }
void cpu_stb_mmu(CPUArchState *env, abi_ptr addr, uint8_t val,

You might want to add the same thing in: accel/tcg/atomic_common.c.inc

Pierrick

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