nit
> +static int compact_zone(struct zone *zone, struct compact_control *cc)
> +{
> + int ret = COMPACT_INCOMPLETE;
> +
> + /* Setup to move all movable pages to the end of the zone */
> + cc->migrate_pfn = zone->zone_start_pfn;
> + cc->free_pfn = cc->migrate_pfn + zone->spanned_pages;
> + cc->free_pfn &= ~(pageblock_nr_pages-1);
> +
> + for (; ret == COMPACT_INCOMPLETE; ret = compact_finished(zone, cc)) {
> + unsigned long nr_migrate, nr_remaining;
> + if (!isolate_migratepages(zone, cc))
> + continue;
> +
> + nr_migrate = cc->nr_migratepages;
> + migrate_pages(&cc->migratepages, compaction_alloc,
> + (unsigned long)cc, 0);
> + update_nr_listpages(cc);
> + nr_remaining = cc->nr_migratepages;
> +
> + count_vm_event(COMPACTBLOCKS);
V1 did compaction per pageblock. but current patch doesn't.
so, Is COMPACTBLOCKS still good name?
> + count_vm_events(COMPACTPAGES, nr_migrate - nr_remaining);
> + if (nr_remaining)
> + count_vm_events(COMPACTPAGEFAILED, nr_remaining);
> +
> + /* Release LRU pages not migrated */
> + if (!list_empty(&cc->migratepages)) {
> + putback_lru_pages(&cc->migratepages);
> + cc->nr_migratepages = 0;
> + }
> +
> + mod_zone_page_state(zone, NR_ISOLATED_ANON, -cc->nr_anon);
> + mod_zone_page_state(zone, NR_ISOLATED_FILE, -cc->nr_file);
I think you don't need decrease this vmstatistics here. migrate_pages() and
putback_lru_pages() alredy does.
other parts, looks good.
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