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mm: balloon: use general non-lru movable page feature

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Now, VM has a feature to migrate non-lru movable pages so balloon
doesn't need custom migration hooks in migrate.c and compaction.c.

Instead, this patch implements the page->mapping->a_ops->
{isolate|migrate|putback} functions.

With that, we could remove hooks for ballooning in general migration
functions and make balloon compaction simple.

[[email protected]: compaction.h requires that the includer first include node.h]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Gioh Kim <[email protected]>
Signed-off-by: Minchan Kim <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Cc: Rafael Aquini <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Minchan Kim 2016-07-26 15:23:09 -07:00 • committed by Linus Torvalds
commit b1123ea6d3
7 changed files with 86 additions and 145 deletions
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19
mm/migrate.c
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@ -170,14 +170,12 @@ void putback_movable_pages(struct list_head *l)
list_del(&page->lru);
dec_zone_page_state(page, NR_ISOLATED_ANON +
page_is_file_cache(page));
if (unlikely(isolated_balloon_page(page))) {
balloon_page_putback(page);
/*
* We isolated non-lru movable page so here we can use
* __PageMovable because LRU page's mapping cannot have
* PAGE_MAPPING_MOVABLE.
*/
} else if (unlikely(__PageMovable(page))) {
if (unlikely(__PageMovable(page))) {
VM_BUG_ON_PAGE(!PageIsolated(page), page);
lock_page(page);
if (PageMovable(page))
@ -992,18 +990,6 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
if (unlikely(!trylock_page(newpage)))
goto out_unlock;
if (unlikely(isolated_balloon_page(page))) {
/*
* A ballooned page does not need any special attention from
* physical to virtual reverse mapping procedures.
* Skip any attempt to unmap PTEs or to remap swap cache,
* in order to avoid burning cycles at rmap level, and perform
* the page migration right away (proteced by page lock).
*/
rc = balloon_page_migrate(newpage, page, mode);
goto out_unlock_both;
}
if (unlikely(!is_lru)) {
rc = move_to_new_page(newpage, page, mode);
goto out_unlock_both;
@ -1058,8 +1044,7 @@ out:
* list in here.
*/
if (rc == MIGRATEPAGE_SUCCESS) {
if (unlikely(__is_movable_balloon_page(newpage) ||
__PageMovable(newpage)))
if (unlikely(__PageMovable(newpage)))
put_page(newpage);
else
putback_lru_page(newpage);