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45 lines
1.0 KiB
45 lines
1.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/fs.h> |
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#include <linux/init.h> |
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#include <linux/proc_fs.h> |
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#include <linux/sched.h> |
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#include <linux/seq_file.h> |
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#include <linux/time.h> |
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#include <linux/time_namespace.h> |
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#include <linux/kernel_stat.h> |
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static int uptime_proc_show(struct seq_file *m, void *v) |
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{ |
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struct timespec64 uptime; |
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struct timespec64 idle; |
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u64 idle_nsec; |
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u32 rem; |
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int i; |
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idle_nsec = 0; |
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for_each_possible_cpu(i) { |
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struct kernel_cpustat kcs; |
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kcpustat_cpu_fetch(&kcs, i); |
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idle_nsec += get_idle_time(&kcs, i); |
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} |
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ktime_get_boottime_ts64(&uptime); |
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timens_add_boottime(&uptime); |
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idle.tv_sec = div_u64_rem(idle_nsec, NSEC_PER_SEC, &rem); |
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idle.tv_nsec = rem; |
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seq_printf(m, "%lu.%02lu %lu.%02lu\n", |
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(unsigned long) uptime.tv_sec, |
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(uptime.tv_nsec / (NSEC_PER_SEC / 100)), |
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(unsigned long) idle.tv_sec, |
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(idle.tv_nsec / (NSEC_PER_SEC / 100))); |
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return 0; |
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} |
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static int __init proc_uptime_init(void) |
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{ |
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proc_create_single("uptime", 0, NULL, uptime_proc_show); |
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return 0; |
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} |
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fs_initcall(proc_uptime_init);
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