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sched/cpuacct: Make user/system times in cpuacct.stat more precise 

cpuacct.stat shows user time based on raw random precision tick
based counters. Use cputime_addjust() to scale these values against the
total runtime accounted by the scheduler, like we already do
for user/system times in /proc/<pid>/stat.

Signed-off-by: Andrey Ryabinin <arbn@yandex-team.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lore.kernel.org/r/20211115164607.23784-4-arbn@yandex-team.com
This commit is contained in:
Andrey Ryabinin 2021-11-15 19:46:07 +03:00 committed by Peter Zijlstra
parent dd02d4234c
commit 8c92606ab8
1 changed files with 15 additions and 10 deletions
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25
kernel/sched/cpuacct.c
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@ -261,25 +261,30 @@ static int cpuacct_all_seq_show(struct seq_file *m, void *V)
static int cpuacct_stats_show(struct seq_file *sf, void *v)
{
struct cpuacct *ca = css_ca(seq_css(sf));
s64 val[CPUACCT_STAT_NSTATS];
struct task_cputime cputime;
u64 val[CPUACCT_STAT_NSTATS];
int cpu;
int stat;
memset(val, 0, sizeof(val));
memset(&cputime, 0, sizeof(cputime));
for_each_possible_cpu(cpu) {
u64 *cpustat = per_cpu_ptr(ca->cpustat, cpu)->cpustat;
val[CPUACCT_STAT_USER] += cpustat[CPUTIME_USER];
val[CPUACCT_STAT_USER] += cpustat[CPUTIME_NICE];
val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_SYSTEM];
val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_IRQ];
val[CPUACCT_STAT_SYSTEM] += cpustat[CPUTIME_SOFTIRQ];
cputime.utime += cpustat[CPUTIME_USER];
cputime.utime += cpustat[CPUTIME_NICE];
cputime.stime += cpustat[CPUTIME_SYSTEM];
cputime.stime += cpustat[CPUTIME_IRQ];
cputime.stime += cpustat[CPUTIME_SOFTIRQ];
cputime.sum_exec_runtime += *per_cpu_ptr(ca->cpuusage, cpu);
}
cputime_adjust(&cputime, &seq_css(sf)->cgroup->prev_cputime,
&val[CPUACCT_STAT_USER], &val[CPUACCT_STAT_SYSTEM]);
for (stat = 0; stat < CPUACCT_STAT_NSTATS; stat++) {
seq_printf(sf, "%s %lld\n",
cpuacct_stat_desc[stat],
(long long)nsec_to_clock_t(val[stat]));
seq_printf(sf, "%s %llu\n", cpuacct_stat_desc[stat],
nsec_to_clock_t(val[stat]));
}
return 0;