From: Fenghua Yu <fenghua...@intel.com> Power Limit Notification (X86_FEATURE_PLN) was added in Sandy Bridge to give the OS the option of knowing when the package has reached a configured power threshold.
Linux-2.6.36 enabled this feature: 0199114c31798af5b83841b21759b64171060d9b (x86, hwmon: Package Level Thermal/Power: power limit) It enabld the interrupt, and the interrupt hander added to the MCE log and printed to the console: printk(KERN_CRIT "CPU%d: %s power limit notification (total events = %lu) printk(KERN_INFO "CPU%d: %s power limit normal\n" However, these events are quite routine on some systems under some conditions, alarming customers and provoking un-necessary customer support calls. So the MCE log entry was deleted in Linux-3.3: 29e9bf1841e4f9df13b4992a716fece7087dd237 (x86, mce, therm_throt: Don't report power limit and package level thermal throttle events in mcelog) Here we delete the corresponding kernel console messages, and then we disable the interrupt by default -- allowing it to be enabled by cmdline for diagnosis purposes. https://bugzilla.kernel.org/show_bug.cgi?id=36182 This pair of patches applies cleanly back to Linux-3.3. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
