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SubjectRe: [PATCH 8/8] Per-container pages reclamation
Pavel Emelianov wrote:
> Implement try_to_free_pages_in_container() to free the
> pages in container that has run out of memory.
>
> The scan_control->isolate_pages() function isolates the
> container pages only.
>

Pavel,

I've just started playing around with these patches, I preferred
the approach of v1. Please see below

> +static unsigned long isolate_container_pages(unsigned long nr_to_scan,
> + struct list_head *src, struct list_head *dst,
> + unsigned long *scanned, struct zone *zone)
> +{
> + unsigned long nr_taken = 0;
> + struct page *page;
> + struct page_container *pc;
> + unsigned long scan;
> + LIST_HEAD(pc_list);
> +
> + for (scan = 0; scan < nr_to_scan && !list_empty(src); scan++) {
> + pc = list_entry(src->prev, struct page_container, list);
> + page = pc->page;
> + if (page_zone(page) != zone)
> + continue;

shrink_zone() will walk all pages looking for pages belonging to this
container and this slows down the reclaim quite a bit. Although we've
reused code, we've ended up walking the entire list of the zone to
find pages belonging to a particular container, this was the same
problem I had with my RSS controller patches.

> +
> + list_move(&pc->list, &pc_list);
> +


--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL
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