The patch titled
Subject: zsmalloc: move struct zs_meta from mapping to freelist
has been added to the -mm tree. Its filename is
zsmalloc-move-struct-zs_meta-from-mapping-to-freelist.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/zsmalloc-move-struct-zs_meta-from-mapping-to-freelist.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/zsmalloc-move-struct-zs_meta-from-mapping-to-freelist.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: zsmalloc: move struct zs_meta from mapping to freelist
For supporting migration from VM, we need to have address_space on every
page so zsmalloc shouldn't use page->mapping. So, this patch moves
zs_meta from mapping to freelist.
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>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 | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
diff -puN mm/zsmalloc.c~zsmalloc-move-struct-zs_meta-from-mapping-to-freelist mm/zsmalloc.c
--- a/mm/zsmalloc.c~zsmalloc-move-struct-zs_meta-from-mapping-to-freelist
+++ a/mm/zsmalloc.c
@@ -29,7 +29,7 @@
* Look at size_class->huge.
* page->lru: links together first pages of various zspages.
* Basically forming list of zspages in a fullness group.
- * page->mapping: override by struct zs_meta
+ * page->freelist: override by struct zs_meta
*
* Usage of struct page flags:
* PG_private: identifies the first component page
@@ -418,7 +418,7 @@ static int get_zspage_inuse(struct page
VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
- m = (struct zs_meta *)&first_page->mapping;
+ m = (struct zs_meta *)&first_page->freelist;
return m->inuse;
}
@@ -429,7 +429,7 @@ static void set_zspage_inuse(struct page
VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
- m = (struct zs_meta *)&first_page->mapping;
+ m = (struct zs_meta *)&first_page->freelist;
m->inuse = val;
}
@@ -439,7 +439,7 @@ static void mod_zspage_inuse(struct page
VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
- m = (struct zs_meta *)&first_page->mapping;
+ m = (struct zs_meta *)&first_page->freelist;
m->inuse += val;
}
@@ -449,7 +449,7 @@ static void set_freeobj(struct page *fir
VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
- m = (struct zs_meta *)&first_page->mapping;
+ m = (struct zs_meta *)&first_page->freelist;
m->freeobj = idx;
}
@@ -459,7 +459,7 @@ static unsigned long get_freeobj(struct
VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
- m = (struct zs_meta *)&first_page->mapping;
+ m = (struct zs_meta *)&first_page->freelist;
return m->freeobj;
}
@@ -471,7 +471,7 @@ static void get_zspage_mapping(struct pa
VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
- m = (struct zs_meta *)&first_page->mapping;
+ m = (struct zs_meta *)&first_page->freelist;
*fullness = m->fullness;
*class_idx = m->class;
}
@@ -484,7 +484,7 @@ static void set_zspage_mapping(struct pa
VM_BUG_ON_PAGE(!is_first_page(first_page), first_page);
- m = (struct zs_meta *)&first_page->mapping;
+ m = (struct zs_meta *)&first_page->freelist;
m->fullness = fullness;
m->class = class_idx;
}
@@ -946,7 +946,6 @@ static void reset_page(struct page *page
clear_bit(PG_private, &page->flags);
clear_bit(PG_private_2, &page->flags);
set_page_private(page, 0);
- page->mapping = NULL;
page->freelist = NULL;
}
@@ -1056,6 +1055,7 @@ static struct page *alloc_zspage(struct
INIT_LIST_HEAD(&page->lru);
if (i == 0) { /* first page */
+ page->freelist = NULL;
SetPagePrivate(page);
set_page_private(page, 0);
first_page = page;
@@ -2068,9 +2068,9 @@ static int __init zs_init(void)
/*
* A zspage's a free object index, class index, fullness group,
- * inuse object count are encoded in its (first)page->mapping
+ * inuse object count are encoded in its (first)page->freelist
* so sizeof(struct zs_meta) should be less than
- * sizeof(page->mapping(i.e., unsigned long)).
+ * sizeof(page->freelist(i.e., void *)).
*/
BUILD_BUG_ON(sizeof(struct zs_meta) > sizeof(unsigned long));
_
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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