For page migration, we need to create page chain of zspage dynamically
so this patch factors it out from alloc_zspage.
Link: http://lkml.kernel.org/r/1464736881-24886-8-git-send-email-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
unsigned long off = 0;
struct page *page = first_page;
unsigned long off = 0;
struct page *page = first_page;
- VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
+ first_page->freelist = NULL;
+ set_zspage_inuse(first_page, 0);
while (page) {
struct page *next_page;
while (page) {
struct page *next_page;
page = next_page;
off %= PAGE_SIZE;
}
page = next_page;
off %= PAGE_SIZE;
}
+
+ set_freeobj(first_page, (unsigned long)location_to_obj(first_page, 0));
-/*
- * Allocate a zspage for the given size class
- */
-static struct page *alloc_zspage(struct size_class *class, gfp_t flags)
+static void create_page_chain(struct page *pages[], int nr_pages)
- int i, error;
- struct page *first_page = NULL, *uninitialized_var(prev_page);
+ int i;
+ struct page *page;
+ struct page *prev_page = NULL;
+ struct page *first_page = NULL;
/*
* Allocate individual pages and link them together as:
/*
* Allocate individual pages and link them together as:
* (i.e. no other sub-page has this flag set) and PG_private_2 to
* identify the last page.
*/
* (i.e. no other sub-page has this flag set) and PG_private_2 to
* identify the last page.
*/
- error = -ENOMEM;
- for (i = 0; i < class->pages_per_zspage; i++) {
- struct page *page;
-
- page = alloc_page(flags);
- if (!page)
- goto cleanup;
+ for (i = 0; i < nr_pages; i++) {
+ page = pages[i];
INIT_LIST_HEAD(&page->lru);
INIT_LIST_HEAD(&page->lru);
- if (i == 0) { /* first page */
SetPagePrivate(page);
set_page_private(page, 0);
first_page = page;
SetPagePrivate(page);
set_page_private(page, 0);
first_page = page;
- set_zspage_inuse(first_page, 0);
}
if (i == 1)
set_page_private(first_page, (unsigned long)page);
}
if (i == 1)
set_page_private(first_page, (unsigned long)page);
set_page_private(page, (unsigned long)first_page);
if (i >= 2)
list_add(&page->lru, &prev_page->lru);
set_page_private(page, (unsigned long)first_page);
if (i >= 2)
list_add(&page->lru, &prev_page->lru);
- if (i == class->pages_per_zspage - 1) /* last page */
SetPagePrivate2(page);
prev_page = page;
}
SetPagePrivate2(page);
prev_page = page;
}
- init_zspage(class, first_page);
+/*
+ * Allocate a zspage for the given size class
+ */
+static struct page *alloc_zspage(struct size_class *class, gfp_t flags)
+{
+ int i;
+ struct page *first_page = NULL;
+ struct page *pages[ZS_MAX_PAGES_PER_ZSPAGE];
- set_freeobj(first_page, (unsigned long)location_to_obj(first_page, 0));
- error = 0; /* Success */
+ for (i = 0; i < class->pages_per_zspage; i++) {
+ struct page *page;
-cleanup:
- if (unlikely(error) && first_page) {
- free_zspage(first_page);
- first_page = NULL;
+ page = alloc_page(flags);
+ if (!page) {
+ while (--i >= 0)
+ __free_page(pages[i]);
+ return NULL;
+ }
+ pages[i] = page;
+ create_page_chain(pages, class->pages_per_zspage);
+ first_page = pages[0];
+ init_zspage(class, first_page);
+