From 0e55b57452d3437f494690dca67bcc55f11d3c60 Mon Sep 17 00:00:00 2001
From: Andrei Vagin <avagin@google.com>
Date: Wed, 7 Apr 2021 16:22:43 -0700
Subject: perf/getpid: add a case when syscalls are executed via mov $XXX,
 %eax; syscall

This is the most often pattern of calling system calls in real applications.

PiperOrigin-RevId: 367320048
---
 test/perf/linux/getpid_benchmark.cc | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'test')

diff --git a/test/perf/linux/getpid_benchmark.cc b/test/perf/linux/getpid_benchmark.cc
index db74cb264..047a034bd 100644
--- a/test/perf/linux/getpid_benchmark.cc
+++ b/test/perf/linux/getpid_benchmark.cc
@@ -31,6 +31,24 @@ void BM_Getpid(benchmark::State& state) {
 
 BENCHMARK(BM_Getpid);
 
+#ifdef __x86_64__
+
+#define SYSNO_STR1(x) #x
+#define SYSNO_STR(x) SYSNO_STR1(x)
+
+// BM_GetpidOpt uses the most often pattern of calling system calls:
+// mov $SYS_XXX, %eax; syscall.
+void BM_GetpidOpt(benchmark::State& state) {
+  for (auto s : state) {
+    __asm__("movl $" SYSNO_STR(SYS_getpid) ", %%eax\n"
+            "syscall\n"
+            : : : "rax", "rcx", "r11");
+  }
+}
+
+BENCHMARK(BM_GetpidOpt);
+#endif  // __x86_64__
+
 }  // namespace
 
 }  // namespace testing
-- 
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