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    Subject[PATCH 04/10] 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 | 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()
    --

    -
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