[Devel] [PATCH vz9 01/27] kernel/stat: Introduce kernel_cpustat operation wrappers

[Nikita Yushchenko]

From: Konstantin Khorenko <khorenko at virtuozzo.com>

Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
Reviewed-by: Andrey Ryabinin <aryabinin at virtuozzo.com>

(cherry-picked from vz8 commit 93bea3d83126 ("kernel/stat: Introduce
kernel_cpustat operation wrappers"))

Signed-off-by: Nikita Yushchenko <nikita.yushchenko at virtuozzo.com>
---
 include/linux/kernel_stat.h | 36 ++++++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/include/linux/kernel_stat.h b/include/linux/kernel_stat.h
index 44ae1a7eb9e3..fb6149076cc5 100644
--- a/include/linux/kernel_stat.h
+++ b/include/linux/kernel_stat.h
@@ -35,6 +35,42 @@ struct kernel_cpustat {
 	u64 cpustat[NR_STATS];
 };
 
+static inline u64 kernel_cpustat_total_usage(const struct kernel_cpustat *p)
+{
+	return p->cpustat[CPUTIME_USER] + p->cpustat[CPUTIME_NICE] +
+	       p->cpustat[CPUTIME_SYSTEM];
+}
+
+static inline u64 kernel_cpustat_total_idle(const struct kernel_cpustat *p)
+{
+	return p->cpustat[CPUTIME_IDLE] + p->cpustat[CPUTIME_IOWAIT];
+}
+
+static inline void kernel_cpustat_zero(struct kernel_cpustat *p)
+{
+	memset(p, 0, sizeof(*p));
+}
+
+static inline void kernel_cpustat_add(const struct kernel_cpustat *lhs,
+				      const struct kernel_cpustat *rhs,
+				      struct kernel_cpustat *res)
+{
+	int i;
+
+	for (i = 0; i < NR_STATS; i++)
+		res->cpustat[i] = lhs->cpustat[i] + rhs->cpustat[i];
+}
+
+static inline void kernel_cpustat_sub(const struct kernel_cpustat *lhs,
+				      const struct kernel_cpustat *rhs,
+				      struct kernel_cpustat *res)
+{
+	int i;
+
+	for (i = 0; i < NR_STATS; i++)
+		res->cpustat[i] = lhs->cpustat[i] - rhs->cpustat[i];
+}
+
 struct kernel_stat {
 	unsigned long irqs_sum;
 	unsigned int softirqs[NR_SOFTIRQS];
-- 
2.30.2