Re: [RFC] memory defragmentation to satisfy high order allocations

[Hiroyuki KAMEZAWA <kamezawa.hiroyu@jp.fujitsu.com>]

how about inserting this if-sentense ?

-- Kame

Marcelo Tosatti wrote:
> +int coalesce_memory(unsigned int order, struct zone *zone)
> +{
<snip>

> +		while (entry != &area->free_list) {
> +			int ret;
> +			page = list_entry(entry, struct page, lru);
> +			entry = entry->next;
> +

   +              if (((page_to_pfn(page) - zone->zone_start_pfn) & (1 << toorder)) {

> +			pwalk = page;
> +
> +			/* Look backwards */
> +
> +			for (walkcount = 1; walkcount<nr_pages; walkcount++) {
                         ..................
> +			}
> +
   +               } else {
> +forward:
> +
> +			pwalk = page;
> +
> +			/* Look forward, skipping the page frames from this 
> +			  high order page we are looking at */
> +
> +			for (walkcount = (1UL << torder); walkcount<nr_pages; 
> +					walkcount++) {
> +				pwalk = page+walkcount;
> +
> +				ret = can_move_page(pwalk);
> +
> +				if (ret) 
> +					nr_freed_pages++;
> +				else
> +					goto loopey;
> +
> +				if (nr_freed_pages == nr_pages)
> +					goto success;
> +			}
> +
   +                }

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