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authorZhao Lei <zhaolei@cn.fujitsu.com>2016-06-20 17:37:20 +0800
committerIngo Molnar <mingo@kernel.org>2016-07-09 13:56:15 +0200
commit277a13e4f0d661678a7084bf97ed96a99c7dac21 (patch)
tree95235ad9dcfa402e6fb363cebbd7b83737434253 /kernel
parent8e546bfafb3121ed25c73a0c02311ec58459344a (diff)
downloadlinux-277a13e4f0d661678a7084bf97ed96a99c7dac21.tar.bz2
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/cpuacct.c40
1 files changed, 40 insertions, 0 deletions
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));
@@ -294,6 +330,10 @@ static struct cftype files[] = {
.seq_show = cpuacct_percpu_sys_seq_show,
},
{
+ .name = "usage_all",
+ .seq_show = cpuacct_all_seq_show,
+ },
+ {
.name = "stat",
.seq_show = cpuacct_stats_show,
},