Counter that are only read with percpu_counter_sum() can use an
arbitrary large batch size.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
include/linux/percpu_counter.h | 29 +++++++++++++++++++++++++++++
1 file changed, 29 insertions(+)
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h
index 01861eebed79..7f01f2e41304 100644
--- a/include/linux/percpu_counter.h
+++ b/include/linux/percpu_counter.h
@@ -193,4 +193,33 @@ static inline void percpu_counter_sub(struct percpu_counter *fbc, s64 amount)
percpu_counter_add(fbc, -amount);
}
+/*
+ * Helpers for percpu counters for which per-cpu drift doesn't matter.
+ * This is typically the case for statistics counters that are read with
+ * percpu_counter_sum{,_positive}().
+ */
+#define PERCPU_COUNTER_LARGE_BATCH (INT_MAX / 2)
+
+static inline void percpu_counter_add_relaxed(struct percpu_counter *fbc,
+ s64 amount)
+{
+ percpu_counter_add_batch(fbc, amount, PERCPU_COUNTER_LARGE_BATCH);
+}
+
+static inline void percpu_counter_sub_relaxed(struct percpu_counter *fbc,
+ s64 amount)
+{
+ percpu_counter_add_relaxed(fbc, amount);
+}
+
+static inline void percpu_counter_inc_relaxed(struct percpu_counter *fbc)
+{
+ percpu_counter_add_relaxed(fbc, 1);
+}
+
+static inline void percpu_counter_dec_relaxed(struct percpu_counter *fbc)
+{
+ percpu_counter_add_relaxed(fbc, -1);
+}
+
#endif /* _LINUX_PERCPU_COUNTER_H */
--
2.25.1
