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sched/cpuacct: Introduce cpuacct.usage_all to show all CPU stats together
In current code, we can get cpuacct data from several files, but each file has various limitations. For example: - We can get CPU usage in user and kernel mode via cpuacct.stat, but we can't get detailed data about each CPU. - We can get each CPU's kernel mode usage in cpuacct.usage_percpu_sys, but we can't get user mode usage data at the same time. This patch introduces cpuacct.usage_all, to show all detailed CPU accounting data together: # cat cpuacct.usage_all cpu user system 0 3809760299 5807968992 1 3250329855 454612211 .. Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/7744460969edd7caaf0e903592ee52353ed9bdd6.1466415271.git.zhaolei@cn.fujitsu.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -240,6 +240,42 @@ static int cpuacct_percpu_seq_show(struct seq_file *m, void *V)
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return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_NSTATS);
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}
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static int cpuacct_all_seq_show(struct seq_file *m, void *V)
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{
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struct cpuacct *ca = css_ca(seq_css(m));
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int index;
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int cpu;
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seq_puts(m, "cpu");
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for (index = 0; index < CPUACCT_STAT_NSTATS; index++)
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seq_printf(m, " %s", cpuacct_stat_desc[index]);
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seq_puts(m, "\n");
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for_each_possible_cpu(cpu) {
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struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu);
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seq_printf(m, "%d", cpu);
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for (index = 0; index < CPUACCT_STAT_NSTATS; index++) {
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#ifndef CONFIG_64BIT
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/*
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* Take rq->lock to make 64-bit read safe on 32-bit
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* platforms.
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*/
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raw_spin_lock_irq(&cpu_rq(cpu)->lock);
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#endif
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seq_printf(m, " %llu", cpuusage->usages[index]);
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#ifndef CONFIG_64BIT
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raw_spin_unlock_irq(&cpu_rq(cpu)->lock);
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#endif
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}
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seq_puts(m, "\n");
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}
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return 0;
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}
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static int cpuacct_stats_show(struct seq_file *sf, void *v)
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{
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struct cpuacct *ca = css_ca(seq_css(sf));
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@ -293,6 +329,10 @@ static struct cftype files[] = {
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.name = "usage_percpu_sys",
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.seq_show = cpuacct_percpu_sys_seq_show,
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},
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{
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.name = "usage_all",
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.seq_show = cpuacct_all_seq_show,
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},
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{
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.name = "stat",
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.seq_show = cpuacct_stats_show,
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