[PATCH 2/8] SGI x86_64 UV: Limit the number of processor bootup messages

[Mike Travis]

Limit the number of processor bootup messages when
system_state == SYSTEM_BOOTING.  Limit the number of
offline messages when system is shutting down.

Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Cc: x86@xxxxxxxxxx
Cc: Rusty Russell <rusty@xxxxxxxxxxxxxxx>
Cc: Yinghai Lu <yinghai@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Mike Travis <travis@xxxxxxx>
---
Example output...

Before:

[   36.305264] Booting processor 1/2 ip 6000
..
[   36.420549] Booting processor 2/4 ip 6000
..
[  101.352770] Booting processor 383/759 ip 6000
..
[  101.524209] Brought up 384 CPUs
[  101.528277] Total of 384 processors activated (1741075.97 BogoMIPS).

After:

[   36.189152] Booting processor 1/2 ip 6000
..
[   36.304541] Booting processor 2/4 ip 6000
..
[   36.464533] printk: further related messages suppressed
[   76.536185] Brought up 384 CPUs
[   76.539894] Total of 384 processors activated (1741015.43 BogoMIPS).
---
 arch/x86/kernel/smpboot.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

--- linux.orig/arch/x86/kernel/smpboot.c
+++ linux/arch/x86/kernel/smpboot.c
@@ -741,6 +741,9 @@
 	/* start_ip had better be page-aligned! */
 	start_ip = setup_trampoline();
 
+	if (cpu > 2 && system_state == SYSTEM_BOOTING)
+		limit_console_output(true);
+
 	/* So we see what's up   */
 	printk(KERN_INFO "Booting processor %d APIC 0x%x ip 0x%lx\n",
 			  cpu, apicid, start_ip);
@@ -838,6 +841,9 @@
 		smpboot_restore_warm_reset_vector();
 	}
 
+	if (cpu > 2 && system_state == SYSTEM_BOOTING)
+		end_limit_console_output();
+
 	return boot_error;
 }
 
@@ -1308,7 +1314,10 @@
 	for (i = 0; i < 10; i++) {
 		/* They ack this in play_dead by setting CPU_DEAD */
 		if (per_cpu(cpu_state, cpu) == CPU_DEAD) {
-			printk(KERN_INFO "CPU %d is now offline\n", cpu);
+			if (cpu < 4 || system_state == SYSTEM_RUNNING ||
+					!limit_console_output(false))
+				printk(KERN_INFO
+					"CPU %d is now offline\n", cpu);
 			if (1 == num_online_cpus())
 				alternatives_smp_switch(0);
 			return;

-- 
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