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mm/zsmalloc: remove unused zspage->isolated 

The zspage->isolated is not used anywhere, we don't need to maintain it,
which needs to hold the heavy pool lock to update it, so just remove it.

Link: https://lkml.kernel.org/r/20240219-b4-szmalloc-migrate-v1-3-34cd49c6545b@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 2024-02-19 13:33:53 +00:00 committed by Andrew Morton
parent 59def443c9
commit 4ad63e1632
1 changed files with 0 additions and 32 deletions
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32
mm/zsmalloc.c
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@ -116,7 +116,6 @@
#define HUGE_BITS 1
#define FULLNESS_BITS 4
#define CLASS_BITS 8
#define ISOLATED_BITS 5
#define MAGIC_VAL_BITS 8
#define MAX(a, b) ((a) >= (b) ? (a) : (b))
@ -246,7 +245,6 @@ struct zspage {
unsigned int huge:HUGE_BITS;
unsigned int fullness:FULLNESS_BITS;
unsigned int class:CLASS_BITS + 1;
unsigned int isolated:ISOLATED_BITS;
unsigned int magic:MAGIC_VAL_BITS;
};
unsigned int inuse;
@ -1732,17 +1730,6 @@ static void migrate_write_unlock(struct zspage *zspage)
}
#ifdef CONFIG_COMPACTION
/* Number of isolated subpage for *page migration* in this zspage */
static void inc_zspage_isolation(struct zspage *zspage)
{
zspage->isolated++;
}
static void dec_zspage_isolation(struct zspage *zspage)
{
VM_BUG_ON(zspage->isolated == 0);
zspage->isolated--;
}
static const struct movable_operations zsmalloc_mops;
@ -1771,21 +1758,12 @@ static void replace_sub_page(struct size_class *class, struct zspage *zspage,
static bool zs_page_isolate(struct page *page, isolate_mode_t mode)
{
struct zs_pool *pool;
struct zspage *zspage;
/*
* Page is locked so zspage couldn't be destroyed. For detail, look at
* lock_zspage in free_zspage.
*/
VM_BUG_ON_PAGE(PageIsolated(page), page);
zspage = get_zspage(page);
pool = zspage->pool;
spin_lock(&pool->lock);
inc_zspage_isolation(zspage);
spin_unlock(&pool->lock);
return true;
}
@ -1850,7 +1828,6 @@ static int zs_page_migrate(struct page *newpage, struct page *page,
kunmap_atomic(s_addr);
replace_sub_page(class, zspage, newpage, page);
dec_zspage_isolation(zspage);
/*
* Since we complete the data copy and set up new zspage structure,
* it's okay to release the pool's lock.
@ -1872,16 +1849,7 @@ static int zs_page_migrate(struct page *newpage, struct page *page,
static void zs_page_putback(struct page *page)
{
struct zs_pool *pool;
struct zspage *zspage;
VM_BUG_ON_PAGE(!PageIsolated(page), page);
zspage = get_zspage(page);
pool = zspage->pool;
spin_lock(&pool->lock);
dec_zspage_isolation(zspage);
spin_unlock(&pool->lock);
}
static const struct movable_operations zsmalloc_mops = {