Re: [PATCH 13/33] readahead: state based method - aging accounting

[Wu Fengguang]

On Fri, May 26, 2006 at 10:04:26AM -0700, Andrew Morton wrote:
> 
> (hey, I haven't finished reading the last batch yet)
> 
> Wu Fengguang <wfg@xxxxxxxxxxxxxxxx> wrote:
> >
> >  /*
> >  + * The node's effective length of inactive_list(s).
> >  + */
> >  +static unsigned long node_free_and_cold_pages(void)
> >  +{
> >  +	unsigned int i;
> >  +	unsigned long sum = 0;
> >  +	struct zone *zones = NODE_DATA(numa_node_id())->node_zones;
> >  +
> >  +	for (i = 0; i < MAX_NR_ZONES; i++)
> >  +		sum += zones[i].nr_inactive +
> >  +			zones[i].free_pages - zones[i].pages_low;
> >  +
> >  +	return sum;
> >  +}
> 
> I guess this should go into page_alloc.c along with all the similar functions.

Moved as adviced.

> Is this function well-named?  Why does it have "cold" in the name?

Because it only sums `nr_inactive', leaving out `nr_active'.
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