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#ifndef _LINUX_PERCPU_COUNTER_H #define _LINUX_PERCPU_COUNTER_H /* * A simple "approximate counter" for use in ext2 and ext3 superblocks. * * WARNING: these things are HUGE. 4 kbytes per counter on 32-way P4. */ #ifdef __KERNEL__ #include <linux/config.h> #include <linux/spinlock.h> #include <linux/smp.h> #include <linux/threads.h> #include <linux/percpu.h> #endif #if defined(CONFIG_SMP) && defined(__KERNEL__) struct percpu_counter { spinlock_t lock; long count; long *counters; }; #if NR_CPUS >= 16 #define FBC_BATCH (NR_CPUS*2) #else #define FBC_BATCH (NR_CPUS*4) #endif static inline void percpu_counter_init(struct percpu_counter *fbc) { spin_lock_init(&fbc->lock); fbc->count = 0; fbc->counters = alloc_percpu(long); } static inline void percpu_counter_destroy(struct percpu_counter *fbc) { free_percpu(fbc->counters); } void percpu_counter_mod(struct percpu_counter *fbc, long amount); long percpu_counter_sum(struct percpu_counter *fbc); static inline long percpu_counter_read(struct percpu_counter *fbc) { return fbc->count; } /* * It is possible for the percpu_counter_read() to return a small negative * number for some counter which should never be negative. */ static inline long percpu_counter_read_positive(struct percpu_counter *fbc) { long ret = fbc->count; barrier(); /* Prevent reloads of fbc->count */ if (ret > 0) return ret; return 1; } #else struct percpu_counter { long count; }; static inline void percpu_counter_init(struct percpu_counter *fbc) { fbc->count = 0; } static inline void percpu_counter_destroy(struct percpu_counter *fbc) { } static inline void percpu_counter_mod(struct percpu_counter *fbc, long amount) { preempt_disable(); fbc->count += amount; preempt_enable(); } static inline long percpu_counter_read(struct percpu_counter *fbc) { return fbc->count; } static inline long percpu_counter_read_positive(struct percpu_counter *fbc) { return fbc->count; } static inline long percpu_counter_sum(struct percpu_counter *fbc) { return percpu_counter_read_positive(fbc); } #endif /* CONFIG_SMP */ static inline void percpu_counter_inc(struct percpu_counter *fbc) { percpu_counter_mod(fbc, 1); } static inline void percpu_counter_dec(struct percpu_counter *fbc) { percpu_counter_mod(fbc, -1); } #endif /* _LINUX_PERCPU_COUNTER_H */