On Mon, 2010-06-21 at 23:14 -0700, Andrew Morton wrote:
> +/*
> + * Compare counter against given value.
> + * Return 1 if greater, 0 if equal and -1 if less
> + */
> +int percpu_counter_compare(struct percpu_counter *fbc, s64 rhs)
> +{
> + s64 count;
> +
> + count = percpu_counter_read(fbc);
> + /* Check to see if rough count will be sufficient for comparison */
> + if (abs(count - rhs) > (percpu_counter_batch*num_online_cpus())) {
> + if (count > rhs)
> + return 1;
> + else
> + return -1;
> + }
> + /* Need to use precise count */
> + count = percpu_counter_sum(fbc);
> + if (count > rhs)
> + return 1;
> + else if (count < rhs)
> + return -1;
> + else
> + return 0;
> +}
> +EXPORT_SYMBOL(percpu_counter_compare);
That won't quite work as advertised for the bdi stuff since we use a
custom batch size.
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