1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _LINUX_KERNEL_STAT_H 3 #define _LINUX_KERNEL_STAT_H 4 5 #include <linux/smp.h> 6 #include <linux/threads.h> 7 #include <linux/percpu.h> 8 #include <linux/interrupt.h> 9 #include <linux/sched.h> 10 #include <linux/vtime.h> 11 #include <asm/irq.h> 12 13 /* 14 * 'kernel_stat.h' contains the definitions needed for doing 15 * some kernel statistics (CPU usage, context switches ...), 16 * used by rstatd/perfmeter 17 */ 18 19 enum cpu_usage_stat { 20 CPUTIME_USER, 21 CPUTIME_NICE, 22 CPUTIME_SYSTEM, 23 CPUTIME_SOFTIRQ, 24 CPUTIME_IRQ, 25 CPUTIME_IDLE, 26 CPUTIME_IOWAIT, 27 CPUTIME_STEAL, 28 CPUTIME_GUEST, 29 CPUTIME_GUEST_NICE, 30 #ifdef CONFIG_SCHED_CORE 31 CPUTIME_FORCEIDLE, 32 #endif 33 NR_STATS, 34 }; 35 36 struct kernel_cpustat { 37 #ifdef CONFIG_NO_HZ_COMMON 38 bool idle_dyntick; 39 bool idle_elapse; 40 seqcount_t idle_sleeptime_seq; 41 u64 idle_entrytime; 42 u64 idle_stealtime[2]; 43 #endif 44 u64 cpustat[NR_STATS]; 45 }; 46 47 struct kernel_stat { 48 unsigned long irqs_sum; 49 unsigned int softirqs[NR_SOFTIRQS]; 50 }; 51 52 DECLARE_PER_CPU(struct kernel_stat, kstat); 53 DECLARE_PER_CPU(struct kernel_cpustat, kernel_cpustat); 54 55 /* Must have preemption disabled for this to be meaningful. */ 56 #define kstat_this_cpu this_cpu_ptr(&kstat) 57 #define kcpustat_this_cpu this_cpu_ptr(&kernel_cpustat) 58 #define kstat_cpu(cpu) per_cpu(kstat, cpu) 59 #define kcpustat_cpu(cpu) per_cpu(kernel_cpustat, cpu) 60 61 extern unsigned long long nr_context_switches_cpu(int cpu); 62 extern unsigned long long nr_context_switches(void); 63 64 extern unsigned int kstat_irqs_cpu(unsigned int irq, int cpu); 65 extern void kstat_incr_irq_this_cpu(unsigned int irq); 66 67 static inline void kstat_incr_softirqs_this_cpu(unsigned int irq) 68 { 69 __this_cpu_inc(kstat.softirqs[irq]); 70 } 71 72 static inline unsigned int kstat_softirqs_cpu(unsigned int irq, int cpu) 73 { 74 return kstat_cpu(cpu).softirqs[irq]; 75 } 76 77 static inline unsigned int kstat_cpu_softirqs_sum(int cpu) 78 { 79 int i; 80 unsigned int sum = 0; 81 82 for (i = 0; i < NR_SOFTIRQS; i++) 83 sum += kstat_softirqs_cpu(i, cpu); 84 85 return sum; 86 } 87 88 #ifdef CONFIG_GENERIC_IRQ_STAT_SNAPSHOT 89 extern void kstat_snapshot_irqs(void); 90 extern unsigned int kstat_get_irq_since_snapshot(unsigned int irq); 91 #else 92 static inline void kstat_snapshot_irqs(void) { } 93 static inline unsigned int kstat_get_irq_since_snapshot(unsigned int irq) { return 0; } 94 #endif 95 96 /* 97 * Number of interrupts per specific IRQ source, since bootup 98 */ 99 extern unsigned int kstat_irqs_usr(unsigned int irq); 100 101 /* 102 * Number of interrupts per cpu, since bootup 103 */ 104 static inline unsigned long kstat_cpu_irqs_sum(unsigned int cpu) 105 { 106 return kstat_cpu(cpu).irqs_sum; 107 } 108 109 #ifdef CONFIG_NO_HZ_COMMON 110 extern void kcpustat_dyntick_start(u64 now); 111 extern void kcpustat_dyntick_stop(u64 now); 112 extern void kcpustat_irq_enter(u64 now); 113 extern void kcpustat_irq_exit(u64 now); 114 extern u64 kcpustat_field_idle(int cpu); 115 extern u64 kcpustat_field_iowait(int cpu); 116 117 static inline bool kcpustat_idle_dyntick(void) 118 { 119 return __this_cpu_read(kernel_cpustat.idle_dyntick); 120 } 121 #else 122 static inline u64 kcpustat_field_idle(int cpu) 123 { 124 return kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE]; 125 } 126 static inline u64 kcpustat_field_iowait(int cpu) 127 { 128 return kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT]; 129 } 130 131 static inline bool kcpustat_idle_dyntick(void) 132 { 133 return false; 134 } 135 #endif /* CONFIG_NO_HZ_COMMON */ 136 137 extern u64 get_cpu_idle_time_us(int cpu, u64 *last_update_time); 138 extern u64 get_cpu_iowait_time_us(int cpu, u64 *last_update_time); 139 140 /* Fetch cputime values when vtime is disabled on a CPU */ 141 static inline u64 kcpustat_field_default(enum cpu_usage_stat usage, int cpu) 142 { 143 if (usage == CPUTIME_IDLE) 144 return kcpustat_field_idle(cpu); 145 if (usage == CPUTIME_IOWAIT) 146 return kcpustat_field_iowait(cpu); 147 return kcpustat_cpu(cpu).cpustat[usage]; 148 } 149 150 static inline void kcpustat_cpu_fetch_default(struct kernel_cpustat *dst, int cpu) 151 { 152 *dst = kcpustat_cpu(cpu); 153 dst->cpustat[CPUTIME_IDLE] = kcpustat_field_idle(cpu); 154 dst->cpustat[CPUTIME_IOWAIT] = kcpustat_field_iowait(cpu); 155 } 156 157 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN 158 extern u64 kcpustat_field(enum cpu_usage_stat usage, int cpu); 159 extern void kcpustat_cpu_fetch(struct kernel_cpustat *dst, int cpu); 160 #else 161 static inline u64 kcpustat_field(enum cpu_usage_stat usage, int cpu) 162 { 163 return kcpustat_field_default(usage, cpu); 164 } 165 166 static inline void kcpustat_cpu_fetch(struct kernel_cpustat *dst, int cpu) 167 { 168 kcpustat_cpu_fetch_default(dst, cpu); 169 } 170 #endif /* !CONFIG_VIRT_CPU_ACCOUNTING_GEN */ 171 172 extern void account_user_time(struct task_struct *, u64); 173 extern void account_guest_time(struct task_struct *, u64); 174 extern void account_system_time(struct task_struct *, int, u64); 175 extern void account_system_index_time(struct task_struct *, u64, 176 enum cpu_usage_stat); 177 extern void account_steal_time(u64); 178 extern void account_idle_time(u64); 179 180 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE 181 static inline void account_process_tick(struct task_struct *tsk, int user) 182 { 183 if (!kcpustat_idle_dyntick()) 184 vtime_flush(tsk); 185 } 186 #else 187 extern void account_process_tick(struct task_struct *, int user); 188 #endif 189 190 #ifdef CONFIG_SCHED_CORE 191 extern void __account_forceidle_time(struct task_struct *tsk, u64 delta); 192 #endif 193 194 #endif /* _LINUX_KERNEL_STAT_H */ 195