Add percpu_counter_mod64() to allow large modifications. Signed-off-by: Peter Zijlstra --- include/linux/percpu_counter.h | 9 +++++++++ lib/percpu_counter.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 37 insertions(+) Index: linux-2.6/include/linux/percpu_counter.h =================================================================== --- linux-2.6.orig/include/linux/percpu_counter.h 2007-04-12 13:54:55.000000000 +0200 +++ linux-2.6/include/linux/percpu_counter.h 2007-04-12 14:00:21.000000000 +0200 @@ -36,6 +36,7 @@ static inline void percpu_counter_destro } void percpu_counter_mod(struct percpu_counter *fbc, s32 amount); +void percpu_counter_mod64(struct percpu_counter *fbc, s64 amount); s64 percpu_counter_sum(struct percpu_counter *fbc); static inline s64 percpu_counter_read(struct percpu_counter *fbc) @@ -81,6 +82,14 @@ percpu_counter_mod(struct percpu_counter preempt_enable(); } +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 2006-07-31 13:07:38.000000000 +0200 +++ linux-2.6/lib/percpu_counter.c 2007-04-12 14:17:12.000000000 +0200 @@ -25,6 +25,34 @@ void percpu_counter_mod(struct percpu_co } EXPORT_SYMBOL(percpu_counter_mod); +void percpu_counter_mod64(struct percpu_counter *fbc, s64 amount) +{ + long count; + s32 *pcount; + int cpu; + + if (amount >= FBC_BATCH || amount <= -FBC_BATCH) { + spin_lock(&fbc->lock); + fbc->count += amount; + spin_unlock(&fbc->lock); + return; + } + + cpu = get_cpu(); + pcount = per_cpu_ptr(fbc->counters, cpu); + count = *pcount + amount; + if (count >= FBC_BATCH || count <= -FBC_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/