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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2007-10-16 23:25:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-17 08:42:44 -0700 |
| commit | bf1d89c81352f6eca72d0c10cfee3dba29ef5efb (patch) | |
| tree | 4154acea12a0273ffbc3eafe39530b2e25aa4ed5 | |
| parent | 52d9f3b4090922f34497ace82bd062d80a465a29 (diff) | |
| download | lwn-bf1d89c81352f6eca72d0c10cfee3dba29ef5efb.tar.gz lwn-bf1d89c81352f6eca72d0c10cfee3dba29ef5efb.zip | |
lib: percpu_count_sum()
Provide an accurate version of percpu_counter_read.
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>
| -rw-r--r-- | include/linux/percpu_counter.h | 18 | ||||
| -rw-r--r-- | lib/percpu_counter.c | 6 |
2 files changed, 20 insertions, 4 deletions
diff --git a/include/linux/percpu_counter.h b/include/linux/percpu_counter.h index dd89eb978393..21e054595bcb 100644 --- a/include/linux/percpu_counter.h +++ b/include/linux/percpu_counter.h @@ -34,13 +34,24 @@ void percpu_counter_init(struct percpu_counter *fbc, s64 amount); void percpu_counter_destroy(struct percpu_counter *fbc); void percpu_counter_set(struct percpu_counter *fbc, s64 amount); void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch); -s64 percpu_counter_sum_positive(struct percpu_counter *fbc); +s64 __percpu_counter_sum(struct percpu_counter *fbc); static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount) { __percpu_counter_add(fbc, amount, FBC_BATCH); } +static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc) +{ + s64 ret = __percpu_counter_sum(fbc); + return ret < 0 ? 0 : ret; +} + +static inline s64 percpu_counter_sum(struct percpu_counter *fbc) +{ + return __percpu_counter_sum(fbc); +} + static inline s64 percpu_counter_read(struct percpu_counter *fbc) { return fbc->count; @@ -107,6 +118,11 @@ static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc) return percpu_counter_read_positive(fbc); } +static inline s64 percpu_counter_sum(struct percpu_counter *fbc) +{ + return percpu_counter_read(fbc); +} + #endif /* CONFIG_SMP */ static inline void percpu_counter_inc(struct percpu_counter *fbc) diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c index b0d80ea22a33..3b0ed80c1efd 100644 --- a/lib/percpu_counter.c +++ b/lib/percpu_counter.c @@ -52,7 +52,7 @@ EXPORT_SYMBOL(__percpu_counter_add); * Add up all the per-cpu counts, return the result. This is a more accurate * but much slower version of percpu_counter_read_positive() */ -s64 percpu_counter_sum_positive(struct percpu_counter *fbc) +s64 __percpu_counter_sum(struct percpu_counter *fbc) { s64 ret; int cpu; @@ -64,9 +64,9 @@ s64 percpu_counter_sum_positive(struct percpu_counter *fbc) ret += *pcount; } spin_unlock(&fbc->lock); - return ret < 0 ? 0 : ret; + return ret; } -EXPORT_SYMBOL(percpu_counter_sum_positive); +EXPORT_SYMBOL(__percpu_counter_sum); void percpu_counter_init(struct percpu_counter *fbc, s64 amount) { |