Messages in this thread Patch in this message | | | Date | Mon, 16 Nov 2009 15:07:24 -0600 | From | Mike Travis <> | Subject | [PATCH 6/6] x86: Limit number of per cpu TSC sync messages |
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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> --- arch/x86/kernel/tsc_sync.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-)
--- linux.orig/arch/x86/kernel/tsc_sync.c +++ linux/arch/x86/kernel/tsc_sync.c @@ -114,13 +114,12 @@ 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 @@ 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); } /* --
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