x86: optimize lock prefix switching to run less frequently

On VMs implemented using JITs that cache translated code changing the lock
prefixes is a quite costly operation that forces the JIT to throw away and
retranslate a lot of code.

Previously a SMP kernel would rewrite the locks once for each CPU which
is quite unnecessary. This patch changes the code to never switch at boot in
 the normal case (SMP kernel booting with >1 CPU) or only once for SMP kernel
on UP.

This makes a significant difference in boot up performance on AMD SimNow!
Also I expect it to be a little faster on native systems too because a smp
switch does a lot of text_poke()s which each synchronize the pipeline.

v1->v2: Rename max_cpus
v1->v2: Fix off by one in UP check (Thomas Gleixner)

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 8 insertions, 8 deletions

diff --git a/init/main.c b/init/main.c
index 3f8aba291ed3..5843fe996703 100644
--- a/init/main.c
+++ b/init/main.c
@@ -128,7 +128,7 @@ static char *ramdisk_execute_command;
 
 #ifdef CONFIG_SMP
 /* Setup configured maximum number of CPUs to activate */
-static unsigned int __initdata max_cpus = NR_CPUS;
+unsigned int __initdata setup_max_cpus = NR_CPUS;
 
 /*
  * Setup routine for controlling SMP activation
@@ -146,7 +146,7 @@ static inline void disable_ioapic_setup(void) {};
 
 static int __init nosmp(char *str)
 {
-        max_cpus = 0;
+        setup_max_cpus = 0;
         disable_ioapic_setup();
         return 0;
 }
@@ -155,8 +155,8 @@ early_param("nosmp", nosmp);
 
 static int __init maxcpus(char *str)
 {
-        get_option(&str, &max_cpus);
-        if (max_cpus == 0)
+        get_option(&str, &setup_max_cpus);
+        if (setup_max_cpus == 0)
                 disable_ioapic_setup();
 
         return 0;
@@ -164,7 +164,7 @@ static int __init maxcpus(char *str)
 
 early_param("maxcpus", maxcpus);
 #else
-#define max_cpus NR_CPUS
+#define setup_max_cpus NR_CPUS
 #endif
 
 /*
@@ -393,7 +393,7 @@ static void __init smp_init(void)
 
         /* FIXME: This should be done in userspace --RR */
         for_each_present_cpu(cpu) {
-                if (num_online_cpus() >= max_cpus)
+                if (num_online_cpus() >= setup_max_cpus)
                         break;
                 if (!cpu_online(cpu))
                         cpu_up(cpu);
@@ -401,7 +401,7 @@ static void __init smp_init(void)
 
         /* Any cleanup work */
         printk(KERN_INFO "Brought up %ld CPUs\n", (long)num_online_cpus());
-        smp_cpus_done(max_cpus);
+        smp_cpus_done(setup_max_cpus);
 }
 
 #endif
@@ -824,7 +824,7 @@ static int __init kernel_init(void * unused)
         __set_special_pids(1, 1);
         cad_pid = task_pid(current);
 
-        smp_prepare_cpus(max_cpus);
+        smp_prepare_cpus(setup_max_cpus);
 
         do_pre_smp_initcalls();