From 8c92606ab81086db00cbb73347d124b4eb169b7e Mon Sep 17 00:00:00 2001 From: Andrey Ryabinin Date: Mon, 15 Nov 2021 19:46:07 +0300 Subject: [PATCH] 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//stat. Signed-off-by: Andrey Ryabinin Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: Daniel Jordan Acked-by: Tejun Heo Link: https://lore.kernel.org/r/20211115164607.23784-4-arbn@yandex-team.com --- kernel/sched/cpuacct.c | 25 +++++++++++++++---------- 1 file 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;