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authorMike Travis <travis@sgi.com>2009-11-17 18:22:16 -0600
committerIngo Molnar <mingo@elte.hu>2009-11-26 10:17:45 +0100
commit9b3660a55a9052518c91cc7c62d89e22f3f6f490 (patch)
treece5869ecbb3ab6db90a9e30cbd1258aa410714cd /arch
parent67f2de0bf9141dd9fe9189d0caaa28d7ad21a523 (diff)
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/tsc_sync.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index f37930954d1..eed156851f5 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -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);
}
/*