x86: mce: Clean up thermal throttling state tracking code
Instead of a mess of three separate percpu variables, consolidate the state into a single structure. Also clean up therm_throt_process(), use cleaner and more understandable variable names and a clearer logic. This, without changing the logic, makes the code more streamlined, more readable and smaller as well: text data bss dec hex filename 1487 169 4 1660 67c therm_throt.o.before 1432 176 4 1612 64c therm_throt.o.after Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Cc: Huang Ying <ying.huang@intel.com> Cc: Andi Kleen <ak@linux.intel.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -34,9 +34,17 @@
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/* How long to wait between reporting thermal events */
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#define CHECK_INTERVAL (300 * HZ)
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static DEFINE_PER_CPU(__u64, next_check) = INITIAL_JIFFIES;
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static DEFINE_PER_CPU(unsigned long, thermal_throttle_count);
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static DEFINE_PER_CPU(bool, thermal_throttle_active);
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/*
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* Current thermal throttling state:
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*/
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struct thermal_state {
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bool is_throttled;
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u64 next_check;
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unsigned long throttle_count;
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};
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static DEFINE_PER_CPU(struct thermal_state, thermal_state);
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static atomic_t therm_throt_en = ATOMIC_INIT(0);
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@ -45,7 +53,9 @@ static atomic_t therm_throt_en = ATOMIC_INIT(0);
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static SYSDEV_ATTR(_name, 0444, therm_throt_sysdev_show_##_name, NULL)
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#define define_therm_throt_sysdev_show_func(name) \
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static ssize_t therm_throt_sysdev_show_##name(struct sys_device *dev, \
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\
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static ssize_t therm_throt_sysdev_show_##name( \
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struct sys_device *dev, \
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struct sysdev_attribute *attr, \
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char *buf) \
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{ \
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@ -55,7 +65,7 @@ static ssize_t therm_throt_sysdev_show_##name(struct sys_device *dev, \
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preempt_disable(); /* CPU hotplug */ \
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if (cpu_online(cpu)) \
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ret = sprintf(buf, "%lu\n", \
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per_cpu(thermal_throttle_##name, cpu)); \
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per_cpu(thermal_state, cpu).name); \
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else \
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ret = 0; \
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preempt_enable(); \
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@ -63,11 +73,11 @@ static ssize_t therm_throt_sysdev_show_##name(struct sys_device *dev, \
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return ret; \
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}
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define_therm_throt_sysdev_show_func(count);
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define_therm_throt_sysdev_one_ro(count);
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define_therm_throt_sysdev_show_func(throttle_count);
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define_therm_throt_sysdev_one_ro(throttle_count);
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static struct attribute *thermal_throttle_attrs[] = {
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&attr_count.attr,
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&attr_throttle_count.attr,
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NULL
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};
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@ -93,33 +103,38 @@ static struct attribute_group thermal_throttle_attr_group = {
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* 1 : Event should be logged further, and a message has been
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* printed to the syslog.
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*/
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static int therm_throt_process(int curr)
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static int therm_throt_process(bool is_throttled)
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{
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unsigned int cpu = smp_processor_id();
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__u64 tmp_jiffs = get_jiffies_64();
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bool was_throttled = __get_cpu_var(thermal_throttle_active);
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bool is_throttled = __get_cpu_var(thermal_throttle_active) = curr;
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struct thermal_state *state;
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unsigned int this_cpu;
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bool was_throttled;
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u64 now;
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this_cpu = smp_processor_id();
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now = get_jiffies_64();
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state = &per_cpu(thermal_state, this_cpu);
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was_throttled = state->is_throttled;
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state->is_throttled = is_throttled;
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if (is_throttled)
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__get_cpu_var(thermal_throttle_count)++;
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state->throttle_count++;
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if (!(was_throttled ^ is_throttled) &&
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time_before64(tmp_jiffs, __get_cpu_var(next_check)))
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time_before64(now, state->next_check))
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return 0;
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__get_cpu_var(next_check) = tmp_jiffs + CHECK_INTERVAL;
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state->next_check = now + CHECK_INTERVAL;
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/* if we just entered the thermal event */
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if (is_throttled) {
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printk(KERN_CRIT "CPU%d: Temperature above threshold, "
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"cpu clock throttled (total events = %lu)\n",
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cpu, __get_cpu_var(thermal_throttle_count));
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printk(KERN_CRIT "CPU%d: Temperature above threshold, cpu clock throttled (total events = %lu)\n", this_cpu, state->throttle_count);
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add_taint(TAINT_MACHINE_CHECK);
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return 1;
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}
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if (was_throttled) {
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printk(KERN_INFO "CPU%d: Temperature/speed normal\n", cpu);
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printk(KERN_INFO "CPU%d: Temperature/speed normal\n", this_cpu);
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return 1;
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}
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@ -213,7 +228,7 @@ static void intel_thermal_interrupt(void)
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__u64 msr_val;
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rdmsrl(MSR_IA32_THERM_STATUS, msr_val);
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if (therm_throt_process(msr_val & THERM_STATUS_PROCHOT))
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if (therm_throt_process((msr_val & THERM_STATUS_PROCHOT) != 0))
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mce_log_therm_throt_event(msr_val);
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}
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