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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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6
lib/percpu_counter.c
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@ -14,7 +14,7 @@ static LIST_HEAD(percpu_counters);
static DEFINE_MUTEX(percpu_counters_lock);
#endif
void percpu_counter_add(struct percpu_counter *fbc, s32 amount)
void __percpu_counter_add(struct percpu_counter *fbc, s32 amount, s32 batch)
{
long count;
s32 *pcount;
@ -22,7 +22,7 @@ void percpu_counter_add(struct percpu_counter *fbc, s32 amount)
pcount = per_cpu_ptr(fbc->counters, cpu);
count = *pcount + amount;
if (count >= FBC_BATCH || count <= -FBC_BATCH) {
if (count >= batch || count <= -batch) {
spin_lock(&fbc->lock);
fbc->count += count;
*pcount = 0;
@ -32,7 +32,7 @@ void percpu_counter_add(struct percpu_counter *fbc, s32 amount)
}
put_cpu();
}
EXPORT_SYMBOL(percpu_counter_add);
EXPORT_SYMBOL(__percpu_counter_add);
/*
* Add up all the per-cpu counts, return the result. This is a more accurate