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| author | Andrey Ryabinin <arbn@yandex-team.com> | 2021-11-15 19:46:07 +0300 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-11-23 09:55:22 +0100 |
| commit | 8c92606ab81086db00cbb73347d124b4eb169b7e (patch) | |
| tree | 5e84fbf5f8e7bc324c161445f80ce1b0f3c54ad1 | |
| parent | dd02d4234c9a2214a81c57a16484304a1a51872a (diff) | |
| download | linux-8c92606ab81086db00cbb73347d124b4eb169b7e.tar.gz | |
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
| -rw-r--r-- | kernel/sched/cpuacct.c | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c index 9de7dd51beb0..3d06c5e4220d 100644 --- a/kernel/sched/cpuacct.c +++ b/kernel/sched/cpuacct.c @@ -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; |