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[RFC PATCH v2 2/6] accel/tcg: Avoid unnecessary call overhead from qemu_
From: |
Max Chou |
Subject: |
[RFC PATCH v2 2/6] accel/tcg: Avoid unnecessary call overhead from qemu_plugin_vcpu_mem_cb |
Date: |
Sat, 1 Jun 2024 01:44:49 +0800 |
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>
---
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 c82048e377e..87ceb954873 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,
--
2.34.1
- [RFC PATCH v2 0/6] Improve the performance of RISC-V vector unit-stride/whole register ld/st instructions, Max Chou, 2024/05/31
- [RFC PATCH v2 1/6] target/riscv: Separate vector segment ld/st instructions, Max Chou, 2024/05/31
- [RFC PATCH v2 2/6] accel/tcg: Avoid unnecessary call overhead from qemu_plugin_vcpu_mem_cb,
Max Chou <=
- [RFC PATCH v2 3/6] target/riscv: Inline vext_ldst_us and corresponding function for performance, Max Chou, 2024/05/31
- [RFC PATCH v2 4/6] target/riscv: Add check_probe_[read|write] helper functions, Max Chou, 2024/05/31
- [RFC PATCH v2 5/6] target/riscv: rvv: Optimize v[l|s]e8.v with limitations, Max Chou, 2024/05/31
- [RFC PATCH v2 6/6] target/riscv: rvv: Optimize vl8re8.v/vs8r.v with limitations, Max Chou, 2024/05/31