From 15d5f8398311f565682959daaca30e3ca7aea600 Mon Sep 17 00:00:00 2001 From: Dmitriy Zavin Date: Tue, 26 Sep 2006 10:52:42 +0200 Subject: [PATCH] x86: Refactor thermal throttle processing Refactor the event processing (syslog messaging and rate limiting) into separate file therm_throt.c. This allows consistent reporting of CPU thermal throttle events. After ACK'ing the interrupt, if the event is current, the user (p4.c/mce_intel.c) calls therm_throt_process to log (and rate limit) the event. If that function returns 1, the user has the option to log things further (such as to mce_log in x86_64). AK: minor cleanup Signed-off-by: Dmitriy Zavin Signed-off-by: Andi Kleen --- arch/i386/kernel/cpu/mcheck/therm_throt.c | 58 +++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 arch/i386/kernel/cpu/mcheck/therm_throt.c (limited to 'arch/i386/kernel/cpu/mcheck/therm_throt.c') diff --git a/arch/i386/kernel/cpu/mcheck/therm_throt.c b/arch/i386/kernel/cpu/mcheck/therm_throt.c new file mode 100644 index 00000000000..85eba00d680 --- /dev/null +++ b/arch/i386/kernel/cpu/mcheck/therm_throt.c @@ -0,0 +1,58 @@ +/* + * linux/arch/i386/kerne/cpu/mcheck/therm_throt.c + * + * Thermal throttle event support code. + * + * Author: Dmitriy Zavin (dmitriyz@google.com) + * + * Credits: Adapted from Zwane Mwaikambo's original code in mce_intel.c. + * + */ + +#include +#include +#include +#include +#include + +/* How long to wait between reporting thermal events */ +#define CHECK_INTERVAL (300 * HZ) + +static DEFINE_PER_CPU(unsigned long, next_check); + +/*** + * therm_throt_process - Process thermal throttling event + * @curr: Whether the condition is current or not (boolean), since the + * thermal interrupt normally gets called both when the thermal + * event begins and once the event has ended. + * + * This function is normally called by the thermal interrupt after the + * IRQ has been acknowledged. + * + * It will take care of rate limiting and printing messages to the syslog. + * + * Returns: 0 : Event should NOT be further logged, i.e. still in + * "timeout" from previous log message. + * 1 : Event should be logged further, and a message has been + * printed to the syslog. + */ +int therm_throt_process(int curr) +{ + unsigned int cpu = smp_processor_id(); + + if (time_before(jiffies, __get_cpu_var(next_check))) + return 0; + + __get_cpu_var(next_check) = jiffies + CHECK_INTERVAL; + + /* if we just entered the thermal event */ + if (curr) { + printk(KERN_CRIT "CPU%d: Temperature above threshold, " + "cpu clock throttled\n", cpu); + add_taint(TAINT_MACHINE_CHECK); + } else { + printk(KERN_CRIT "CPU%d: Temperature/speed normal\n", cpu); + } + + return 1; +} -- cgit v1.2.3