lib: percpu_counter_set
Provide a method to set a percpu counter to a specified value. Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -32,6 +32,7 @@ struct percpu_counter {
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void percpu_counter_init(struct percpu_counter *fbc, s64 amount);
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void percpu_counter_init(struct percpu_counter *fbc, s64 amount);
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void percpu_counter_destroy(struct percpu_counter *fbc);
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void percpu_counter_destroy(struct percpu_counter *fbc);
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void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
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void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
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void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
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s64 percpu_counter_sum(struct percpu_counter *fbc);
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s64 percpu_counter_sum(struct percpu_counter *fbc);
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@ -75,6 +76,11 @@ static inline void percpu_counter_destroy(struct percpu_counter *fbc)
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{
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{
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}
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}
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static inline void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
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{
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fbc->count = amount;
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}
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#define __percpu_counter_add(fbc, amount, batch) \
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#define __percpu_counter_add(fbc, amount, batch) \
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percpu_counter_add(fbc, amount)
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percpu_counter_add(fbc, amount)
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@ -14,6 +14,20 @@ static LIST_HEAD(percpu_counters);
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static DEFINE_MUTEX(percpu_counters_lock);
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static DEFINE_MUTEX(percpu_counters_lock);
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#endif
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#endif
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void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
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{
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int cpu;
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spin_lock(&fbc->lock);
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for_each_possible_cpu(cpu) {
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s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
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*pcount = 0;
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}
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fbc->count = amount;
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spin_unlock(&fbc->lock);
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}
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EXPORT_SYMBOL(percpu_counter_set);
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void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
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void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
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{
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{
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s64 count;
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s64 count;
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