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x86: Limit number of per cpu TSC sync messages 

Limit the number of per cpu TSC sync messages by only printing
to the console if an error occurs, otherwise print as a DEBUG
message.

The info message "Skipping synchronization ..." is only printed
after the last cpu has booted.

Signed-off-by: Mike Travis <travis@sgi.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Roland Dreier <rdreier@cisco.com>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Tejun Heo <tj@kernel.org>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091118002222.181053000@alcatraz.americas.sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Mike Travis 2009-11-17 18:22:16 -06:00 committed by Ingo Molnar
parent 67f2de0bf9
commit 9b3660a55a
1 changed files with 7 additions and 6 deletions
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13
arch/x86/kernel/tsc_sync.c
View File

@ -114,13 +114,12 @@ void __cpuinit check_tsc_sync_source(int cpu)
return;
if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE)) {
printk_once(KERN_INFO "Skipping synchronization checks as TSC is reliable.\n");
if (cpu == (nr_cpu_ids-1) || system_state != SYSTEM_BOOTING)
pr_info(
"Skipped synchronization checks as TSC is reliable.\n");
return;
}
pr_info("checking TSC synchronization [CPU#%d -> CPU#%d]:",
smp_processor_id(), cpu);
/*
* Reset it - in case this is a second bootup:
*/
@ -142,12 +141,14 @@ void __cpuinit check_tsc_sync_source(int cpu)
cpu_relax();
if (nr_warps) {
printk("\n");
pr_warning("TSC synchronization [CPU#%d -> CPU#%d]:\n",
smp_processor_id(), cpu);
pr_warning("Measured %Ld cycles TSC warp between CPUs, "
"turning off TSC clock.\n", max_warp);
mark_tsc_unstable("check_tsc_sync_source failed");
} else {
printk(" passed.\n");
pr_debug("TSC synchronization [CPU#%d -> CPU#%d]: passed\n",
smp_processor_id(), cpu);
}
/*