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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