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lib: percpu_counter variable batch

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Because the current batch setup has an quadric error bound on the counter,
allow for an alternative setup.

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 23:25:43 -07:00 • committed by Linus Torvalds
parent 3cb4f9fa0c
commit 252e0ba6b7
2 changed files with 12 additions and 4 deletions
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10
include/linux/percpu_counter.h
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@ -32,9 +32,14 @@ struct percpu_counter {
void percpu_counter_init(struct percpu_counter *fbc, s64 amount);
void percpu_counter_destroy(struct percpu_counter *fbc);
void percpu_counter_add(struct percpu_counter *fbc, s32 amount);
void __percpu_counter_add(struct percpu_counter *fbc, s32 amount, s32 batch);
s64 percpu_counter_sum(struct percpu_counter *fbc);
static inline void percpu_counter_add(struct percpu_counter *fbc, s32 amount)
{
__percpu_counter_add(fbc, amount, FBC_BATCH);
}
static inline s64 percpu_counter_read(struct percpu_counter *fbc)
{
return fbc->count;
@ -70,6 +75,9 @@ static inline void percpu_counter_destroy(struct percpu_counter *fbc)
{
}
#define __percpu_counter_add(fbc, amount, batch) \
percpu_counter_add(fbc, amount)
static inline void
percpu_counter_add(struct percpu_counter *fbc, s32 amount)
{