Add percpu_counter_mod64() to allow large modifications.
Signed-off-by: Peter Zijlstra <[email protected]>
---
include/linux/percpu_counter.h | 17 +++++++++++++++++
lib/percpu_counter.c | 20 ++++++++++++++++++++
2 files changed, 37 insertions(+)
Index: linux-2.6/include/linux/percpu_counter.h
===================================================================
--- linux-2.6.orig/include/linux/percpu_counter.h 2007-05-23 20:36:06.000000000 +0200
+++ linux-2.6/include/linux/percpu_counter.h 2007-05-23 20:37:41.000000000 +0200
@@ -33,6 +33,7 @@ struct percpu_counter {
void percpu_counter_init(struct percpu_counter *fbc, s64 amount);
void percpu_counter_destroy(struct percpu_counter *fbc);
void __percpu_counter_mod(struct percpu_counter *fbc, s32 amount, s32 batch);
+void __percpu_counter_mod64(struct percpu_counter *fbc, s64 amount, s32 batch);
s64 percpu_counter_sum(struct percpu_counter *fbc);
static inline void percpu_counter_mod(struct percpu_counter *fbc, s32 amount)
@@ -40,6 +41,11 @@ static inline void percpu_counter_mod(st
__percpu_counter_mod(fbc, amount, FBC_BATCH);
}
+static inline void percpu_counter_mod64(struct percpu_counter *fbc, s64 amount)
+{
+ __percpu_counter_mod64(fbc, amount, FBC_BATCH);
+}
+
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{
return fbc->count;
@@ -86,6 +92,17 @@ percpu_counter_mod(struct percpu_counter
preempt_enable();
}
+#define __percpu_counter_mod64(fbc, amount, batch) \
+ percpu_counter_mod64(fbc, amount)
+
+static inline void
+percpu_counter_mod64(struct percpu_counter *fbc, s64 amount)
+{
+ preempt_disable();
+ fbc->count += amount;
+ preempt_enable();
+}
+
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{
return fbc->count;
Index: linux-2.6/lib/percpu_counter.c
===================================================================
--- linux-2.6.orig/lib/percpu_counter.c 2007-05-23 20:36:21.000000000 +0200
+++ linux-2.6/lib/percpu_counter.c 2007-05-23 20:37:34.000000000 +0200
@@ -34,6 +34,26 @@ void __percpu_counter_mod(struct percpu_
}
EXPORT_SYMBOL(__percpu_counter_mod);
+void __percpu_counter_mod64(struct percpu_counter *fbc, s64 amount, s32 batch)
+{
+ s64 count;
+ s32 *pcount;
+ int cpu = get_cpu();
+
+ pcount = per_cpu_ptr(fbc->counters, cpu);
+ count = *pcount + amount;
+ if (count >= batch || count <= -batch) {
+ spin_lock(&fbc->lock);
+ fbc->count += count;
+ *pcount = 0;
+ spin_unlock(&fbc->lock);
+ } else {
+ *pcount = count;
+ }
+ put_cpu();
+}
+EXPORT_SYMBOL(__percpu_counter_mod64);
+
/*
* Add up all the per-cpu counts, return the result. This is a more accurate
* but much slower version of percpu_counter_read_positive()
--
-
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