sched/cpuacct: Add cpuacct_acount_field()

So we can remove open-coded cpuacct code in cputime.c.

Signed-off-by: Li Zefan <lizefan@huawei.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/51553692.9060008@huawei.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

3 files changed, 30 insertions, 17 deletions

diff --git a/kernel/sched/cpuacct.c b/kernel/sched/cpuacct.c
index 48b5e9184dcc..72bd971ea377 100644
--- a/kernel/sched/cpuacct.c
+++ b/kernel/sched/cpuacct.c
@@ -218,6 +218,29 @@ void cpuacct_charge(struct task_struct *tsk, u64 cputime)
         rcu_read_unlock();
 }
 
+/*
+ * Add user/system time to cpuacct.
+ *
+ * Note: it's the caller that updates the account of the root cgroup.
+ */
+void cpuacct_account_field(struct task_struct *p, int index, u64 val)
+{
+        struct kernel_cpustat *kcpustat;
+        struct cpuacct *ca;
+
+        if (unlikely(!cpuacct_subsys.active))
+                return;
+
+        rcu_read_lock();
+        ca = task_ca(p);
+        while (ca && (ca != &root_cpuacct)) {
+                kcpustat = this_cpu_ptr(ca->cpustat);
+                kcpustat->cpustat[index] += val;
+                ca = parent_ca(ca);
+        }
+        rcu_read_unlock();
+}
+
 void __init cpuacct_init(void)
 {
         root_cpuacct.cpustat = &kernel_cpustat;
diff --git a/kernel/sched/cpuacct.h b/kernel/sched/cpuacct.h
index 551acd729562..bd0409b85525 100644
--- a/kernel/sched/cpuacct.h
+++ b/kernel/sched/cpuacct.h
@@ -43,6 +43,7 @@ static inline struct cpuacct *parent_ca(struct cpuacct *ca)
 
 extern void cpuacct_init(void);
 extern void cpuacct_charge(struct task_struct *tsk, u64 cputime);
+extern void cpuacct_account_field(struct task_struct *p, int index, u64 val);
 
 #else
 
@@ -54,4 +55,9 @@ static inline void cpuacct_charge(struct task_struct *tsk, u64 cputime)
 {
 }
 
+static inline void
+cpuacct_account_field(struct task_struct *p, int index, u64 val)
+{
+}
+
 #endif
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 699d59756ece..33508dc78d0c 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -115,10 +115,6 @@ static int irqtime_account_si_update(void)
 static inline void task_group_account_field(struct task_struct *p, int index,
                                             u64 tmp)
 {
-#ifdef CONFIG_CGROUP_CPUACCT
-        struct kernel_cpustat *kcpustat;
-        struct cpuacct *ca;
-#endif
         /*
          * Since all updates are sure to touch the root cgroup, we
          * get ourselves ahead and touch it first. If the root cgroup
@@ -127,19 +123,7 @@ static inline void task_group_account_field(struct task_struct *p, int index,
          */
         __get_cpu_var(kernel_cpustat).cpustat[index] += tmp;
 
-#ifdef CONFIG_CGROUP_CPUACCT
-        if (unlikely(!cpuacct_subsys.active))
-                return;
-
-        rcu_read_lock();
-        ca = task_ca(p);
-        while (ca && (ca != &root_cpuacct)) {
-                kcpustat = this_cpu_ptr(ca->cpustat);
-                kcpustat->cpustat[index] += tmp;
-                ca = parent_ca(ca);
-        }
-        rcu_read_unlock();
-#endif
+        cpuacct_account_field(p, index, tmp);
 }
 
 /*