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zsmalloc: move huge compressed obj from page to zspage

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The flag aims for zspage, not per page.  Let's move it to zspage.

Link: https://lkml.kernel.org/r/20211115185909.3949505-6-minchan@kernel.org
Signed-off-by: Minchan Kim <minchan@kernel.org>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
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 2022-01-21 22:14:04 -08:00 committed by Linus Torvalds
parent 3ae92ac23b
commit a41ec880aa
1 changed files with 26 additions and 24 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

50
mm/zsmalloc.c
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@ -121,6 +121,7 @@
#define OBJ_INDEX_BITS (BITS_PER_LONG - _PFN_BITS - OBJ_TAG_BITS)
#define OBJ_INDEX_MASK ((_AC(1, UL) << OBJ_INDEX_BITS) - 1)
#define HUGE_BITS 1
#define FULLNESS_BITS 2
#define CLASS_BITS 8
#define ISOLATED_BITS 3
@ -213,22 +214,6 @@ struct size_class {
struct zs_size_stat stats;
};
/* huge object: pages_per_zspage == 1 && maxobj_per_zspage == 1 */
static void SetPageHugeObject(struct page *page)
{
SetPageOwnerPriv1(page);
}
static void ClearPageHugeObject(struct page *page)
{
ClearPageOwnerPriv1(page);
}
static int PageHugeObject(struct page *page)
{
return PageOwnerPriv1(page);
}
/*
* Placed within free objects to form a singly linked list.
* For every zspage, zspage->freeobj gives head of this list.
@ -278,6 +263,7 @@ struct zs_pool {
struct zspage {
struct {
unsigned int huge:HUGE_BITS;
unsigned int fullness:FULLNESS_BITS;
unsigned int class:CLASS_BITS + 1;
unsigned int isolated:ISOLATED_BITS;
@ -298,6 +284,17 @@ struct mapping_area {
enum zs_mapmode vm_mm; /* mapping mode */
};
/* huge object: pages_per_zspage == 1 && maxobj_per_zspage == 1 */
static void SetZsHugePage(struct zspage *zspage)
{
zspage->huge = 1;
}
static bool ZsHugePage(struct zspage *zspage)
{
return zspage->huge;
}
#ifdef CONFIG_COMPACTION
static int zs_register_migration(struct zs_pool *pool);
static void zs_unregister_migration(struct zs_pool *pool);
@ -830,7 +827,9 @@ static struct zspage *get_zspage(struct page *page)
static struct page *get_next_page(struct page *page)
{
if (unlikely(PageHugeObject(page)))
struct zspage *zspage = get_zspage(page);
if (unlikely(ZsHugePage(zspage)))
return NULL;
return (struct page *)page->index;
@ -880,8 +879,9 @@ static unsigned long handle_to_obj(unsigned long handle)
static bool obj_allocated(struct page *page, void *obj, unsigned long *phandle)
{
unsigned long handle;
struct zspage *zspage = get_zspage(page);
if (unlikely(PageHugeObject(page))) {
if (unlikely(ZsHugePage(zspage))) {
VM_BUG_ON_PAGE(!is_first_page(page), page);
handle = page->index;
} else
@ -920,7 +920,6 @@ static void reset_page(struct page *page)
ClearPagePrivate(page);
set_page_private(page, 0);
page_mapcount_reset(page);
ClearPageHugeObject(page);
page->index = 0;
}
@ -1062,7 +1061,7 @@ static void create_page_chain(struct size_class *class, struct zspage *zspage,
SetPagePrivate(page);
if (unlikely(class->objs_per_zspage == 1 &&
class->pages_per_zspage == 1))
SetPageHugeObject(page);
SetZsHugePage(zspage);
} else {
prev_page->index = (unsigned long)page;
}
@ -1307,7 +1306,7 @@ void *zs_map_object(struct zs_pool *pool, unsigned long handle,
ret = __zs_map_object(area, pages, off, class->size);
out:
if (likely(!PageHugeObject(page)))
if (likely(!ZsHugePage(zspage)))
ret += ZS_HANDLE_SIZE;
return ret;
@ -1395,7 +1394,7 @@ static unsigned long obj_malloc(struct zs_pool *pool,
vaddr = kmap_atomic(m_page);
link = (struct link_free *)vaddr + m_offset / sizeof(*link);
set_freeobj(zspage, link->next >> OBJ_TAG_BITS);
if (likely(!PageHugeObject(m_page)))
if (likely(!ZsHugePage(zspage)))
/* record handle in the header of allocated chunk */
link->handle = handle;
else
@ -1496,7 +1495,10 @@ static void obj_free(int class_size, unsigned long obj)
/* Insert this object in containing zspage's freelist */
link = (struct link_free *)(vaddr + f_offset);
link->next = get_freeobj(zspage) << OBJ_TAG_BITS;
if (likely(!ZsHugePage(zspage)))
link->next = get_freeobj(zspage) << OBJ_TAG_BITS;
else
f_page->index = 0;
kunmap_atomic(vaddr);
set_freeobj(zspage, f_objidx);
mod_zspage_inuse(zspage, -1);
@ -1867,7 +1869,7 @@ static void replace_sub_page(struct size_class *class, struct zspage *zspage,
create_page_chain(class, zspage, pages);
set_first_obj_offset(newpage, get_first_obj_offset(oldpage));
if (unlikely(PageHugeObject(oldpage)))
if (unlikely(ZsHugePage(zspage)))
newpage->index = oldpage->index;
__SetPageMovable(newpage, page_mapping(oldpage));
}