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mm/zsmalloc: remove get_zspage_mapping()

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Actually we seldom use the class_idx returned from get_zspage_mapping(),
only the zspage->fullness is useful, just use zspage->fullness to remove
this helper.

Note zspage->fullness is not stable outside pool->lock, remove redundant
"VM_BUG_ON(fullness != ZS_INUSE_RATIO_0)" in async_free_zspage() since we
already have the same VM_BUG_ON() in __free_zspage(), which is safe to
access zspage->fullness with pool->lock held.

Link: https://lkml.kernel.org/r/20240220-b4-zsmalloc-cleanup-v1-3-5c5ee4ccdd87@bytedance.com
Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Yosry Ahmed <yosryahmed@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Chengming Zhou 2024-02-20 06:53:02 +00:00 committed by Andrew Morton
parent 67eaedc1c5
commit ce335e0723
1 changed files with 4 additions and 24 deletions
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28
mm/zsmalloc.c
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@ -470,16 +470,6 @@ static inline void set_freeobj(struct zspage *zspage, unsigned int obj)
zspage->freeobj = obj;
}
static void get_zspage_mapping(struct zspage *zspage,
unsigned int *class_idx,
int *fullness)
{
BUG_ON(zspage->magic != ZSPAGE_MAGIC);
*fullness = zspage->fullness;
*class_idx = zspage->class;
}
static struct size_class *zspage_class(struct zs_pool *pool,
struct zspage *zspage)
{
@ -708,12 +698,10 @@ static void remove_zspage(struct size_class *class, struct zspage *zspage)
*/
static int fix_fullness_group(struct size_class *class, struct zspage *zspage)
{
int class_idx;
int currfg, newfg;
int newfg;
get_zspage_mapping(zspage, &class_idx, &currfg);
newfg = get_fullness_group(class, zspage);
if (newfg == currfg)
if (newfg == zspage->fullness)
goto out;
remove_zspage(class, zspage);
@ -835,15 +823,11 @@ static void __free_zspage(struct zs_pool *pool, struct size_class *class,
struct zspage *zspage)
{
struct page *page, *next;
int fg;
unsigned int class_idx;
get_zspage_mapping(zspage, &class_idx, &fg);
assert_spin_locked(&pool->lock);
VM_BUG_ON(get_zspage_inuse(zspage));
VM_BUG_ON(fg != ZS_INUSE_RATIO_0);
VM_BUG_ON(zspage->fullness != ZS_INUSE_RATIO_0);
next = page = get_first_page(zspage);
do {
@ -1857,8 +1841,6 @@ static void async_free_zspage(struct work_struct *work)
{
int i;
struct size_class *class;
unsigned int class_idx;
int fullness;
struct zspage *zspage, *tmp;
LIST_HEAD(free_pages);
struct zs_pool *pool = container_of(work, struct zs_pool,
@ -1879,10 +1861,8 @@ static void async_free_zspage(struct work_struct *work)
list_del(&zspage->list);
lock_zspage(zspage);
get_zspage_mapping(zspage, &class_idx, &fullness);
VM_BUG_ON(fullness != ZS_INUSE_RATIO_0);
class = pool->size_class[class_idx];
spin_lock(&pool->lock);
class = zspage_class(pool, zspage);
__free_zspage(pool, class, zspage);
spin_unlock(&pool->lock);
}