schbench: Add support for AArch64 CPUs

Instruction derived from the Linux kernel's cpu_relax() implementation for arm64. Signed-off-by: Danny Lin <[email protected]>
srikard · Aug 20, 2019 · 0769517 · 0769517
1 parent 3d16b23
commit 0769517
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/schbench.c b/schbench.c
@@ -744,7 +744,14 @@ static void run_rps_thread(struct thread_data *worker_threads_mem)
  }
 }
 
+#if defined(__x86_64__) || defined(__i386__)
 #define nop __asm__ __volatile__("rep;nop": : :"memory")
+#elif defined(__aarch64__)
+#define nop __asm__ __volatile__("yield" ::: "memory")
+#else
+#error Unsupported architecture
+#endif
+
 static void usec_spin(unsigned long spin_time)
 {
  struct timeval now;