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https://github.com/torvalds/linux
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bfc3f0281e
The architectures that override cputime_t (s390, ppc) don't provide any version of nsecs_to_cputime(). Indeed this cputime_t implementation by backend only happens when CONFIG_VIRT_CPU_ACCOUNTING_NATIVE=y under which the core code doesn't make any use of nsecs_to_cputime(). At least for now. We are going to make a broader use of it so lets provide a default version with a per usecs granularity. It should be good enough for most usecases. Cc: Ingo Molnar <mingo@kernel.org> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rik van Riel <riel@redhat.com> Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
52 lines
1.2 KiB
C
52 lines
1.2 KiB
C
#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/kernel_stat.h>
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#include <linux/cputime.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 timespec uptime;
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struct timespec idle;
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u64 idletime;
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u64 nsec;
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u32 rem;
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int i;
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idletime = 0;
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for_each_possible_cpu(i)
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idletime += (__force u64) kcpustat_cpu(i).cpustat[CPUTIME_IDLE];
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get_monotonic_boottime(&uptime);
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nsec = cputime64_to_jiffies64(idletime) * TICK_NSEC;
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idle.tv_sec = div_u64_rem(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 uptime_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, uptime_proc_show, NULL);
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}
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static const struct file_operations uptime_proc_fops = {
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.open = uptime_proc_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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};
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static int __init proc_uptime_init(void)
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{
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proc_create("uptime", 0, NULL, &uptime_proc_fops);
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return 0;
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}
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fs_initcall(proc_uptime_init);
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