add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/proc/stat.c
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@@ -23,21 +23,21 @@
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 #ifdef arch_idle_time
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-static u64 get_idle_time(int cpu)
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+u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
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 {
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 	u64 idle;
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-	idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
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+	idle = kcs->cpustat[CPUTIME_IDLE];
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 	if (cpu_online(cpu) && !nr_iowait_cpu(cpu))
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 		idle += arch_idle_time(cpu);
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 	return idle;
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 }
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-static u64 get_iowait_time(int cpu)
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+static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
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 {
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 	u64 iowait;
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-	iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
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+	iowait = kcs->cpustat[CPUTIME_IOWAIT];
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 	if (cpu_online(cpu) && nr_iowait_cpu(cpu))
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 		iowait += arch_idle_time(cpu);
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 	return iowait;
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@@ -45,7 +45,7 @@
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 #else
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-static u64 get_idle_time(int cpu)
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+u64 get_idle_time(struct kernel_cpustat *kcs, int cpu)
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 {
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 	u64 idle, idle_usecs = -1ULL;
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@@ -54,14 +54,14 @@
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 	if (idle_usecs == -1ULL)
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 		/* !NO_HZ or cpu offline so we can rely on cpustat.idle */
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-		idle = kcpustat_cpu(cpu).cpustat[CPUTIME_IDLE];
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+		idle = kcs->cpustat[CPUTIME_IDLE];
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 	else
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 		idle = idle_usecs * NSEC_PER_USEC;
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 	return idle;
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 }
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-static u64 get_iowait_time(int cpu)
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+static u64 get_iowait_time(struct kernel_cpustat *kcs, int cpu)
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 {
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 	u64 iowait, iowait_usecs = -1ULL;
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@@ -70,7 +70,7 @@
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 	if (iowait_usecs == -1ULL)
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 		/* !NO_HZ or cpu offline so we can rely on cpustat.iowait */
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-		iowait = kcpustat_cpu(cpu).cpustat[CPUTIME_IOWAIT];
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+		iowait = kcs->cpustat[CPUTIME_IOWAIT];
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 	else
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 		iowait = iowait_usecs * NSEC_PER_USEC;
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@@ -78,6 +78,31 @@
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 }
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 #endif
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+
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+static void show_irq_gap(struct seq_file *p, unsigned int gap)
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+{
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+	static const char zeros[] = " 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0";
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+
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+	while (gap > 0) {
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+		unsigned int inc;
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+
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+		inc = min_t(unsigned int, gap, ARRAY_SIZE(zeros) / 2);
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+		seq_write(p, zeros, 2 * inc);
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+		gap -= inc;
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+	}
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+}
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+
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+static void show_all_irqs(struct seq_file *p)
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+{
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+	unsigned int i, next = 0;
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+
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+	for_each_active_irq(i) {
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+		show_irq_gap(p, i - next);
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+		seq_put_decimal_ull(p, " ", kstat_irqs_usr(i));
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+		next = i + 1;
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+	}
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+	show_irq_gap(p, nr_irqs - next);
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+}
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 static int show_stat(struct seq_file *p, void *v)
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 {
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@@ -95,18 +120,23 @@
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 	getboottime64(&boottime);
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 	for_each_possible_cpu(i) {
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-		user += kcpustat_cpu(i).cpustat[CPUTIME_USER];
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-		nice += kcpustat_cpu(i).cpustat[CPUTIME_NICE];
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-		system += kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
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-		idle += get_idle_time(i);
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-		iowait += get_iowait_time(i);
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-		irq += kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
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-		softirq += kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
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-		steal += kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
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-		guest += kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
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-		guest_nice += kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
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-		sum += kstat_cpu_irqs_sum(i);
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-		sum += arch_irq_stat_cpu(i);
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+		struct kernel_cpustat kcpustat;
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+		u64 *cpustat = kcpustat.cpustat;
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+
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+		kcpustat_cpu_fetch(&kcpustat, i);
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+
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+		user		+= cpustat[CPUTIME_USER];
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+		nice		+= cpustat[CPUTIME_NICE];
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+		system		+= cpustat[CPUTIME_SYSTEM];
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+		idle		+= get_idle_time(&kcpustat, i);
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+		iowait		+= get_iowait_time(&kcpustat, i);
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+		irq		+= cpustat[CPUTIME_IRQ];
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+		softirq		+= cpustat[CPUTIME_SOFTIRQ];
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+		steal		+= cpustat[CPUTIME_STEAL];
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+		guest		+= cpustat[CPUTIME_GUEST];
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+		guest_nice	+= cpustat[CPUTIME_GUEST_NICE];
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+		sum		+= kstat_cpu_irqs_sum(i);
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+		sum		+= arch_irq_stat_cpu(i);
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 		for (j = 0; j < NR_SOFTIRQS; j++) {
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 			unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
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@@ -130,17 +160,22 @@
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 	seq_putc(p, '\n');
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 	for_each_online_cpu(i) {
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+		struct kernel_cpustat kcpustat;
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+		u64 *cpustat = kcpustat.cpustat;
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+
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+		kcpustat_cpu_fetch(&kcpustat, i);
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+
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 		/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
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-		user = kcpustat_cpu(i).cpustat[CPUTIME_USER];
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-		nice = kcpustat_cpu(i).cpustat[CPUTIME_NICE];
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-		system = kcpustat_cpu(i).cpustat[CPUTIME_SYSTEM];
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-		idle = get_idle_time(i);
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-		iowait = get_iowait_time(i);
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-		irq = kcpustat_cpu(i).cpustat[CPUTIME_IRQ];
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-		softirq = kcpustat_cpu(i).cpustat[CPUTIME_SOFTIRQ];
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-		steal = kcpustat_cpu(i).cpustat[CPUTIME_STEAL];
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-		guest = kcpustat_cpu(i).cpustat[CPUTIME_GUEST];
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-		guest_nice = kcpustat_cpu(i).cpustat[CPUTIME_GUEST_NICE];
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+		user		= cpustat[CPUTIME_USER];
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+		nice		= cpustat[CPUTIME_NICE];
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+		system		= cpustat[CPUTIME_SYSTEM];
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+		idle		= get_idle_time(&kcpustat, i);
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+		iowait		= get_iowait_time(&kcpustat, i);
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+		irq		= cpustat[CPUTIME_IRQ];
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+		softirq		= cpustat[CPUTIME_SOFTIRQ];
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+		steal		= cpustat[CPUTIME_STEAL];
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+		guest		= cpustat[CPUTIME_GUEST];
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+		guest_nice	= cpustat[CPUTIME_GUEST_NICE];
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 		seq_printf(p, "cpu%d", i);
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 		seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
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 		seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));
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@@ -156,9 +191,7 @@
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 	}
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 	seq_put_decimal_ull(p, "intr ", (unsigned long long)sum);
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-	/* sum again ? it could be updated? */
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-	for_each_irq_nr(j)
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-		seq_put_decimal_ull(p, " ", kstat_irqs_usr(j));
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+	show_all_irqs(p);
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 	seq_printf(p,
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 		"\nctxt %llu\n"
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@@ -190,16 +223,17 @@
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 	return single_open_size(file, show_stat, NULL, size);
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 }
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-static const struct file_operations proc_stat_operations = {
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-	.open		= stat_open,
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-	.read		= seq_read,
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-	.llseek		= seq_lseek,
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-	.release	= single_release,
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+static const struct proc_ops stat_proc_ops = {
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+	.proc_flags	= PROC_ENTRY_PERMANENT,
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+	.proc_open	= stat_open,
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+	.proc_read_iter	= seq_read_iter,
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+	.proc_lseek	= seq_lseek,
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+	.proc_release	= single_release,
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 };
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 static int __init proc_stat_init(void)
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 {
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-	proc_create("stat", 0, NULL, &proc_stat_operations);
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+	proc_create("stat", 0, NULL, &stat_proc_ops);
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 	return 0;
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 }
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 fs_initcall(proc_stat_init);