From: Zhao Lei Date: Mon, 20 Jun 2016 09:37:20 +0000 (+0800) Subject: sched/cpuacct: Introduce cpuacct.usage_all to show all CPU stats together X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=277a13e4f0d661678a7084bf97ed96a99c7dac21;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git 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 Cc: KOSAKI Motohiro Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/7744460969edd7caaf0e903592ee52353ed9bdd6.1466415271.git.zhaolei@cn.fujitsu.com Signed-off-by: Ingo Molnar --- diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c index 677cd1ab33b7..bc0b309c3f19 100644 --- a/kernel/sched/cpuacct.c +++ b/kernel/sched/cpuacct.c @@ -240,6 +240,42 @@ static int cpuacct_percpu_seq_show(struct seq_file *m, void *V) return __cpuacct_percpu_seq_show(m, CPUACCT_STAT_NSTATS); } +static int cpuacct_all_seq_show(struct seq_file *m, void *V) +{ + struct cpuacct *ca = css_ca(seq_css(m)); + int index; + int cpu; + + seq_puts(m, "cpu"); + for (index = 0; index < CPUACCT_STAT_NSTATS; index++) + seq_printf(m, " %s", cpuacct_stat_desc[index]); + seq_puts(m, "\n"); + + for_each_possible_cpu(cpu) { + struct cpuacct_usage *cpuusage = per_cpu_ptr(ca->cpuusage, cpu); + + seq_printf(m, "%d", cpu); + + for (index = 0; index < CPUACCT_STAT_NSTATS; index++) { +#ifndef CONFIG_64BIT + /* + * Take rq->lock to make 64-bit read safe on 32-bit + * platforms. + */ + raw_spin_lock_irq(&cpu_rq(cpu)->lock); +#endif + + seq_printf(m, " %llu", cpuusage->usages[index]); + +#ifndef CONFIG_64BIT + raw_spin_unlock_irq(&cpu_rq(cpu)->lock); +#endif + } + seq_puts(m, "\n"); + } + return 0; +} + static int cpuacct_stats_show(struct seq_file *sf, void *v) { struct cpuacct *ca = css_ca(seq_css(sf)); @@ -293,6 +329,10 @@ static struct cftype files[] = { .name = "usage_percpu_sys", .seq_show = cpuacct_percpu_sys_seq_show, }, + { + .name = "usage_all", + .seq_show = cpuacct_all_seq_show, + }, { .name = "stat", .seq_show = cpuacct_stats_show,