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127b2eb44f
Fetching the idle cputime is available through a variety of accessors all
over the place depending on the different accounting flavours and needs:
- idle vtime generic accounting can be accessed by kcpustat_field(),
kcpustat_cpu_fetch(), get_idle/iowait_time() and
get_cpu_idle/iowait_time_us()
- dynticks-idle accounting can only be accessed by get_idle/iowait_time()
or get_cpu_idle/iowait_time_us()
- CONFIG_NO_HZ_COMMON=n idle accounting can be accessed by kcpustat_field()
kcpustat_cpu_fetch(), or get_idle/iowait_time() but not by
get_cpu_idle/iowait_time_us()
Moreover get_idle/iowait_time() relies on get_cpu_idle/iowait_time_us()
with a non-sensical conversion to microseconds and back to nanoseconds on
the way.
Start consolidating the APIs with removing get_idle/iowait_time() and make
kcpustat_field() and kcpustat_cpu_fetch() work for all cases.
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Tested-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Link: https://patch.msgid.link/20260508131647.43868-13-frederic@kernel.org
46 lines
1.0 KiB
C
46 lines
1.0 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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idle_nsec += kcpustat_field(CPUTIME_IDLE, i);
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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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