The patch titled
Subject: zsmalloc: factor page chain functionality out
has been added to the -mm tree. Its filename is
zsmalloc-factor-page-chain-functionality-out.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zsmalloc-factor-page-chain-functionality-out.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zsmalloc-factor-page-chain-functionality-out.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: zsmalloc: factor page chain functionality out
For migration, we need to create sub-page chain of zspage dynamically so
this patch factors it out from alloc_zspage.
As a minor refactoring, it makes OBJ_ALLOCATED_TAG assign more clear in
obj_malloc(it could be another patch but it's trivial so I want to put
together in this patch).
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Konstantin Khlebnikov <koct9i@xxxxxxxxx>
Cc: Rafael Aquini <aquini@xxxxxxxxxx>
Cc: Russ Knize <rknize@xxxxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Gioh Kim <gi-oh.kim@xxxxxxxxxxxxxxxx>
Cc: Sangseok Lee <sangseok.lee@xxxxxxx>
Cc: Chan Gyun Jeong <chan.jeong@xxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: YiPing Xu <xuyiping@xxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zsmalloc.c | 80 +++++++++++++++++++++++++++---------------------
1 file changed, 46 insertions(+), 34 deletions(-)
diff -puN mm/zsmalloc.c~zsmalloc-factor-page-chain-functionality-out mm/zsmalloc.c
--- a/mm/zsmalloc.c~zsmalloc-factor-page-chain-functionality-out
+++ a/mm/zsmalloc.c
@@ -981,7 +981,9 @@ static void init_zspage(struct size_clas
unsigned long off = 0;
struct page *page = first_page;
- VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
+ first_page->freelist = NULL;
+ INIT_LIST_HEAD(&first_page->lru);
+ set_zspage_inuse(first_page, 0);
while (page) {
struct page *next_page;
@@ -1026,13 +1028,44 @@ static void init_zspage(struct size_clas
set_freeobj(first_page, 0);
}
+static void create_page_chain(struct page *pages[], int nr_pages)
+{
+ int i;
+ struct page *page;
+ struct page *prev_page = NULL;
+ struct page *first_page = NULL;
+
+ for (i = 0; i < nr_pages; i++) {
+ page = pages[i];
+
+ INIT_LIST_HEAD(&page->lru);
+ if (i == 0) {
+ SetPagePrivate(page);
+ set_page_private(page, 0);
+ first_page = page;
+ }
+
+ if (i == 1)
+ set_page_private(first_page, (unsigned long)page);
+ if (i >= 1)
+ set_page_private(page, (unsigned long)first_page);
+ if (i >= 2)
+ list_add(&page->lru, &prev_page->lru);
+ if (i == nr_pages - 1)
+ SetPagePrivate2(page);
+
+ prev_page = page;
+ }
+}
+
/*
* Allocate a zspage for the given size class
*/
static struct page *alloc_zspage(struct size_class *class, gfp_t flags)
{
- int i, error;
- struct page *first_page = NULL, *uninitialized_var(prev_page);
+ int i;
+ struct page *first_page = NULL;
+ struct page *pages[ZS_MAX_PAGES_PER_ZSPAGE];
/*
* Allocate individual pages and link them together as:
@@ -1045,43 +1078,23 @@ static struct page *alloc_zspage(struct
* (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;
-
- INIT_LIST_HEAD(&page->lru);
- if (i == 0) { /* first page */
- page->freelist = NULL;
- SetPagePrivate(page);
- set_page_private(page, 0);
- first_page = page;
- set_zspage_inuse(page, 0);
+ if (!page) {
+ while (--i >= 0)
+ __free_page(pages[i]);
+ return NULL;
}
- if (i == 1)
- set_page_private(first_page, (unsigned long)page);
- if (i >= 1)
- 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;
+
+ pages[i] = page;
}
+ create_page_chain(pages, class->pages_per_zspage);
+ first_page = pages[0];
init_zspage(class, first_page);
- error = 0; /* Success */
-
-cleanup:
- if (unlikely(error) && first_page) {
- free_zspage(first_page);
- first_page = NULL;
- }
-
return first_page;
}
@@ -1421,7 +1434,6 @@ static unsigned long obj_malloc(struct s
unsigned long m_offset;
void *vaddr;
- handle |= OBJ_ALLOCATED_TAG;
obj = get_freeobj(first_page);
objidx_to_page_and_offset(class, first_page, obj,
&m_page, &m_offset);
@@ -1431,10 +1443,10 @@ static unsigned long obj_malloc(struct s
set_freeobj(first_page, link->next >> OBJ_ALLOCATED_TAG);
if (!class->huge)
/* record handle in the header of allocated chunk */
- link->handle = handle;
+ link->handle = handle | OBJ_ALLOCATED_TAG;
else
/* record handle in first_page->private */
- set_page_private(first_page, handle);
+ set_page_private(first_page, handle | OBJ_ALLOCATED_TAG);
kunmap_atomic(vaddr);
mod_zspage_inuse(first_page, 1);
zs_stat_inc(class, OBJ_USED, 1);
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
zsmalloc-use-first_page-rather-than-page.patch
zsmalloc-clean-up-many-bug_on.patch
zsmalloc-reordering-function-parameter.patch
zsmalloc-remove-unused-pool-param-in-obj_free.patch
mm-use-put_page-to-free-page-instead-of-putback_lru_page.patch
mm-compaction-support-non-lru-movable-page-migration.patch
mm-add-non-lru-movable-page-support-document.patch
mm-balloon-use-general-movable-page-feature-into-balloon.patch
zsmalloc-keep-max_object-in-size_class.patch
zsmalloc-squeeze-inuse-into-page-mapping.patch
zsmalloc-remove-page_mapcount_reset.patch
zsmalloc-squeeze-freelist-into-page-mapping.patch
zsmalloc-move-struct-zs_meta-from-mapping-to-freelist.patch
zsmalloc-factor-page-chain-functionality-out.patch
zsmalloc-separate-free_zspage-from-putback_zspage.patch
zsmalloc-zs_compact-refactoring.patch
zsmalloc-migrate-head-page-of-zspage.patch
zsmalloc-use-single-linked-list-for-page-chain.patch
zsmalloc-migrate-tail-pages-in-zspage.patch
zram-use-__gfp_movable-for-memory-allocation.patch
--
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