Changeset 2b264c4 in mainline

Timestamp:

2023-02-02T21:58:36Z (4 months ago)

Author:

Jiří Zárevúcky <zarevucky.jiri@…>

Branches:

master

Children:

b076dfb

Parents:

f43d8ce

git-author:

Jiří Zárevúcky <zarevucky.jiri@…> (2023-01-20 18:16:32)

git-committer:

Jiří Zárevúcky <zarevucky.jiri@…> (2023-02-02 21:58:36)

Message:

Add architecture-specific spinlock optimization

Location:

kernel

Files:

• arch/amd64/include/arch/asm.h (modified) (1 diff)
• arch/arm32/include/arch/asm.h (modified) (1 diff)
• arch/arm64/include/arch/asm.h (modified) (1 diff)
• arch/ia32/include/arch/asm.h (modified) (1 diff)
• generic/src/synch/spinlock.c (modified) (3 diffs)

kernel/arch/amd64/include/arch/asm.h

@@ -58 +58 @@
         }
 }
+
+#define ARCH_SPIN_HINT() asm volatile ("pause\n")
 
 /** Byte from port

kernel/arch/arm32/include/arch/asm.h

@@ -65 +65 @@
 }
 
+#ifdef PROCESSOR_ARCH_armv7_a
+#define ARCH_SPIN_HINT() asm volatile ("yield")
+#endif
+
 _NO_TRACE static inline void pio_write_8(ioport8_t *port, uint8_t v)
 {

kernel/arch/arm64/include/arch/asm.h

@@ -60 +60 @@
                 ;
 }
+
+#define ARCH_SPIN_HINT() asm volatile ("yield")
 
 /** Output byte to port.

kernel/arch/ia32/include/arch/asm.h

@@ -63 +63 @@
         );
 }
+
+#define ARCH_SPIN_HINT() asm volatile ("pause\n")
 
 #define GEN_READ_REG(reg) _NO_TRACE static inline sysarg_t read_ ##reg (void) \

kernel/generic/src/synch/spinlock.c

@@ -37 +37 @@
  */
 
+#include <arch/asm.h>
 #include <synch/spinlock.h>
 #include <atomic.h>
@@ -47 +48 @@
 #include <stacktrace.h>
 #include <cpu.h>
+
+#ifndef ARCH_SPIN_HINT
+#define ARCH_SPIN_HINT() ((void)0)
+#endif
 
 /** Initialize spinlock
@@ -77 +82 @@
 
         while (atomic_flag_test_and_set_explicit(&lock->flag, memory_order_acquire)) {
+                ARCH_SPIN_HINT();
+
 #ifdef CONFIG_DEBUG_SPINLOCK
                 /*