alinux: cpuacct/proc_stat: Consider isolcpus

to #26424323

When "isolcpus=" is passed, skip all its accountings.
Signed-off-by: NXunlei Pang <xlpang@linux.alibaba.com>
Tested-by: NYihao Wu <wuyihao@linux.alibaba.com>
Acked-by: NXunlei Pang <xlpang@linux.alibaba.com>
Signed-off-by: NYihao Wu <wuyihao@linux.alibaba.com>

kernel/sched/cpuacct.c

@@ -377,6 +377,9 @@ static int cpuacct_proc_stats_show(struct seq_file *sf, void *v)
 		struct cpuacct_usage_result res;
 
 		for_each_possible_cpu(cpu) {
+			if (!housekeeping_cpu(cpu, HK_FLAG_DOMAIN))
+				continue;
+
 			rcu_read_lock();
 			__cpuacct_get_usage_result(ca, cpu,
 					cgroup_tg(cgrp), &res);