lkml.org 
[lkml]   [2007]   [May]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 03/15] lib: percpu_counter_mod64
Add percpu_counter_mod64() to allow large modifications.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
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 2007-04-29 18:15:26.000000000 +0200
+++ linux-2.6/include/linux/percpu_counter.h 2007-04-29 18:16:49.000000000 +0200
@@ -39,6 +39,7 @@ static inline void percpu_counter_destro
}

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)
@@ -46,6 +47,11 @@ 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;
@@ -92,6 +98,17 @@ 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 2007-04-29 18:14:40.000000000 +0200
+++ linux-2.6/lib/percpu_counter.c 2007-04-29 18:15:34.000000000 +0200
@@ -25,6 +25,26 @@ 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()
--

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-05-10 12:19    [W:0.069 / U:9.884 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site