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lib: percpu_count_sum()

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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>
This commit is contained in:
Peter Zijlstra 2007-10-16 23:25:45 -07:00 committed by Linus Torvalds
parent 52d9f3b409
commit bf1d89c813
2 changed files with 20 additions and 4 deletions
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18
include/linux/percpu_counter.h
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@ -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_destroy(struct percpu_counter *fbc);
void percpu_counter_set(struct percpu_counter *fbc, s64 amount); void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch); 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) static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
{ {
__percpu_counter_add(fbc, amount, FBC_BATCH); __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) static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{ {
return fbc->count; return fbc->count;
@ -107,6 +118,11 @@ static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
return percpu_counter_read_positive(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 */ #endif /* CONFIG_SMP */
static inline void percpu_counter_inc(struct percpu_counter *fbc) static inline void percpu_counter_inc(struct percpu_counter *fbc)

6
lib/percpu_counter.c
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@ -52,7 +52,7 @@ EXPORT_SYMBOL(__percpu_counter_add);
* Add up all the per-cpu counts, return the result. This is a more accurate * Add up all the per-cpu counts, return the result. This is a more accurate
* but much slower version of percpu_counter_read_positive() * 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; s64 ret;
int cpu; int cpu;
@ -64,9 +64,9 @@ s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
ret += *pcount; ret += *pcount;
} }
spin_unlock(&fbc->lock); 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) void percpu_counter_init(struct percpu_counter *fbc, s64 amount)
{ {