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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.

[akpm@linux-foundation.org: compaction.h requires that the includer first include node.h]
Link: http://lkml.kernel.org/r/1464736881-24886-4-git-send-email-minchan@kernel.org
Signed-off-by: Gioh Kim <gi-oh.kim@profitbricks.com>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Rafael Aquini <aquini@redhat.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim
2016-07-26 15:23:09 -07:00
committed by Linus Torvalds
parent bda807d444
commit b1123ea6d3
7 changed files with 87 additions and 146 deletions
Download Patch File Download Diff File Expand all files Collapse all files

54
include/linux/balloon_compaction.h
View File

@@ -45,9 +45,11 @@
#define _LINUX_BALLOON_COMPACTION_H
#include <linux/pagemap.h>
#include <linux/page-flags.h>
#include <linux/migrate.h>
#include <linux/node.h>
#include <linux/compaction.h>
#include <linux/gfp.h>
#include <linux/err.h>
#include <linux/fs.h>
/*
* Balloon device information descriptor.
@@ -62,6 +64,7 @@ struct balloon_dev_info {
struct list_head pages; /* Pages enqueued & handled to Host */
int (*migratepage)(struct balloon_dev_info *, struct page *newpage,
struct page *page, enum migrate_mode mode);
struct inode *inode;
};
extern struct page *balloon_page_enqueue(struct balloon_dev_info *b_dev_info);
@@ -73,44 +76,18 @@ static inline void balloon_devinfo_init(struct balloon_dev_info *balloon)
spin_lock_init(&balloon->pages_lock);
INIT_LIST_HEAD(&balloon->pages);
balloon->migratepage = NULL;
balloon->inode = NULL;
}
#ifdef CONFIG_BALLOON_COMPACTION
extern bool balloon_page_isolate(struct page *page);
extern const struct address_space_operations balloon_aops;
extern bool balloon_page_isolate(struct page *page,
isolate_mode_t mode);
extern void balloon_page_putback(struct page *page);
extern int balloon_page_migrate(struct page *newpage,
extern int balloon_page_migrate(struct address_space *mapping,
struct page *newpage,
struct page *page, enum migrate_mode mode);
/*
* __is_movable_balloon_page - helper to perform @page PageBalloon tests
*/
static inline bool __is_movable_balloon_page(struct page *page)
{
return PageBalloon(page);
}
/*
* balloon_page_movable - test PageBalloon to identify balloon pages
* and PagePrivate to check that the page is not
* isolated and can be moved by compaction/migration.
*
* As we might return false positives in the case of a balloon page being just
* released under us, this need to be re-tested later, under the page lock.
*/
static inline bool balloon_page_movable(struct page *page)
{
return PageBalloon(page) && PagePrivate(page);
}
/*
* isolated_balloon_page - identify an isolated balloon page on private
* compaction/migration page lists.
*/
static inline bool isolated_balloon_page(struct page *page)
{
return PageBalloon(page);
}
/*
* balloon_page_insert - insert a page into the balloon's page list and make
* the page->private assignment accordingly.
@@ -124,7 +101,7 @@ static inline void balloon_page_insert(struct balloon_dev_info *balloon,
struct page *page)
{
__SetPageBalloon(page);
SetPagePrivate(page);
__SetPageMovable(page, balloon->inode->i_mapping);
set_page_private(page, (unsigned long)balloon);
list_add(&page->lru, &balloon->pages);
}
@@ -140,11 +117,14 @@ static inline void balloon_page_insert(struct balloon_dev_info *balloon,
static inline void balloon_page_delete(struct page *page)
{
__ClearPageBalloon(page);
__ClearPageMovable(page);
set_page_private(page, 0);
if (PagePrivate(page)) {
ClearPagePrivate(page);
/*
* No touch page.lru field once @page has been isolated
* because VM is using the field.
*/
if (!PageIsolated(page))
list_del(&page->lru);
}
}
/*