korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-11-24 04:34:08 +08:00
Code Issues Packages Projects Releases Wiki Activity

procfs: Use all-in-one vtime aware kcpustat accessor

Browse Source 
Now that we can read also user and guest time safely under vtime, use
the relevant accessor to fix frozen kcpustat values on nohz_full CPUs.

Reported-by: Yauheni Kaliuta <yauheni.kaliuta@redhat.com>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Wanpeng Li <wanpengli@tencent.com>
Link: https://lkml.kernel.org/r/20191121024430.19938-4-frederic@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2019-11-21 03:44:27 +01:00 committed by Ingo Molnar
parent 74722bb223
commit 26dae145a7
1 changed files with 30 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

54
fs/proc/stat.c
View File

@ -120,20 +120,23 @@ static int show_stat(struct seq_file *p, void *v)
getboottime64(&boottime);
for_each_possible_cpu(i) {
struct kernel_cpustat *kcs = &kcpustat_cpu(i);
struct kernel_cpustat kcpustat;
u64 *cpustat = kcpustat.cpustat;
user += kcs->cpustat[CPUTIME_USER];
nice += kcs->cpustat[CPUTIME_NICE];
system += kcpustat_field(kcs, CPUTIME_SYSTEM, i);
idle += get_idle_time(kcs, i);
iowait += get_iowait_time(kcs, i);
irq += kcs->cpustat[CPUTIME_IRQ];
softirq += kcs->cpustat[CPUTIME_SOFTIRQ];
steal += kcs->cpustat[CPUTIME_STEAL];
guest += kcs->cpustat[CPUTIME_GUEST];
guest_nice += kcs->cpustat[CPUTIME_GUEST_NICE];
sum += kstat_cpu_irqs_sum(i);
sum += arch_irq_stat_cpu(i);
kcpustat_cpu_fetch(&kcpustat, i);
user += cpustat[CPUTIME_USER];
nice += cpustat[CPUTIME_NICE];
system += cpustat[CPUTIME_SYSTEM];
idle += get_idle_time(&kcpustat, i);
iowait += get_iowait_time(&kcpustat, i);
irq += cpustat[CPUTIME_IRQ];
softirq += cpustat[CPUTIME_SOFTIRQ];
steal += cpustat[CPUTIME_STEAL];
guest += cpustat[CPUTIME_GUEST];
guest_nice += cpustat[CPUTIME_USER];
sum += kstat_cpu_irqs_sum(i);
sum += arch_irq_stat_cpu(i);
for (j = 0; j < NR_SOFTIRQS; j++) {
unsigned int softirq_stat = kstat_softirqs_cpu(j, i);
@ -157,19 +160,22 @@ static int show_stat(struct seq_file *p, void *v)
seq_putc(p, '\n');
for_each_online_cpu(i) {
struct kernel_cpustat *kcs = &kcpustat_cpu(i);
struct kernel_cpustat kcpustat;
u64 *cpustat = kcpustat.cpustat;
kcpustat_cpu_fetch(&kcpustat, i);
/* Copy values here to work around gcc-2.95.3, gcc-2.96 */
user = kcs->cpustat[CPUTIME_USER];
nice = kcs->cpustat[CPUTIME_NICE];
system = kcpustat_field(kcs, CPUTIME_SYSTEM, i);
idle = get_idle_time(kcs, i);
iowait = get_iowait_time(kcs, i);
irq = kcs->cpustat[CPUTIME_IRQ];
softirq = kcs->cpustat[CPUTIME_SOFTIRQ];
steal = kcs->cpustat[CPUTIME_STEAL];
guest = kcs->cpustat[CPUTIME_GUEST];
guest_nice = kcs->cpustat[CPUTIME_GUEST_NICE];
user = cpustat[CPUTIME_USER];
nice = cpustat[CPUTIME_NICE];
system = cpustat[CPUTIME_SYSTEM];
idle = get_idle_time(&kcpustat, i);
iowait = get_iowait_time(&kcpustat, i);
irq = cpustat[CPUTIME_IRQ];
softirq = cpustat[CPUTIME_SOFTIRQ];
steal = cpustat[CPUTIME_STEAL];
guest = cpustat[CPUTIME_GUEST];
guest_nice = cpustat[CPUTIME_USER];
seq_printf(p, "cpu%d", i);
seq_put_decimal_ull(p, " ", nsec_to_clock_t(user));
seq_put_decimal_ull(p, " ", nsec_to_clock_t(nice));