ef1d61781b
Mark /proc/devices /proc/kpagecount /proc/kpageflags /proc/kpagecgroup /proc/loadavg /proc/meminfo /proc/softirqs /proc/uptime /proc/version as permanent /proc entries, saving alloc/free and some list/spinlock ops per use. These files are never removed by the kernel so it is OK to mark them. Link: https://lkml.kernel.org/r/Yyn527DzDMa+r0Yj@localhost.localdomain Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
50 lines
1.1 KiB
C
50 lines
1.1 KiB
C
// 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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#include "internal.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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struct proc_dir_entry *pde;
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pde = proc_create_single("uptime", 0, NULL, uptime_proc_show);
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pde_make_permanent(pde);
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return 0;
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}
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fs_initcall(proc_uptime_init);
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