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slub: use slab_list instead of lru 

Currently we use the page->lru list for maintaining lists of slabs.  We
have a list in the page structure (slab_list) that can be used for this
purpose.  Doing so makes the code cleaner since we are not overloading the
lru list.

Use the slab_list instead of the lru list for maintaining lists of slabs.

Link: http://lkml.kernel.org/r/20190402230545.2929-6-tobin@kernel.org
Signed-off-by: Tobin C. Harding <tobin@kernel.org>
Acked-by: Christoph Lameter <cl@linux.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tobin C. Harding 2019-05-13 17:16:12 -07:00 committed by Linus Torvalds
parent 6dfd1b653c
commit 916ac05278
1 changed files with 20 additions and 20 deletions
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40
mm/slub.c
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@ -1014,7 +1014,7 @@ static void add_full(struct kmem_cache *s,
return;
lockdep_assert_held(&n->list_lock);
list_add(&page->lru, &n->full);
list_add(&page->slab_list, &n->full);
}
static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct page *page)
@ -1023,7 +1023,7 @@ static void remove_full(struct kmem_cache *s, struct kmem_cache_node *n, struct
return;
lockdep_assert_held(&n->list_lock);
list_del(&page->lru);
list_del(&page->slab_list);
}
/* Tracking of the number of slabs for debugging purposes */
@ -1764,9 +1764,9 @@ __add_partial(struct kmem_cache_node *n, struct page *page, int tail)
{
n->nr_partial++;
if (tail == DEACTIVATE_TO_TAIL)
list_add_tail(&page->lru, &n->partial);
list_add_tail(&page->slab_list, &n->partial);
else
list_add(&page->lru, &n->partial);
list_add(&page->slab_list, &n->partial);
}
static inline void add_partial(struct kmem_cache_node *n,
@ -1780,7 +1780,7 @@ static inline void remove_partial(struct kmem_cache_node *n,
struct page *page)
{
lockdep_assert_held(&n->list_lock);
list_del(&page->lru);
list_del(&page->slab_list);
n->nr_partial--;
}
@ -1854,7 +1854,7 @@ static void *get_partial_node(struct kmem_cache *s, struct kmem_cache_node *n,
return NULL;
spin_lock(&n->list_lock);
list_for_each_entry_safe(page, page2, &n->partial, lru) {
list_for_each_entry_safe(page, page2, &n->partial, slab_list) {
void *t;
if (!pfmemalloc_match(page, flags))
@ -2398,7 +2398,7 @@ static unsigned long count_partial(struct kmem_cache_node *n,
struct page *page;
spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, lru)
list_for_each_entry(page, &n->partial, slab_list)
x += get_count(page);
spin_unlock_irqrestore(&n->list_lock, flags);
return x;
@ -3696,10 +3696,10 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
BUG_ON(irqs_disabled());
spin_lock_irq(&n->list_lock);
list_for_each_entry_safe(page, h, &n->partial, lru) {
list_for_each_entry_safe(page, h, &n->partial, slab_list) {
if (!page->inuse) {
remove_partial(n, page);
list_add(&page->lru, &discard);
list_add(&page->slab_list, &discard);
} else {
list_slab_objects(s, page,
"Objects remaining in %s on __kmem_cache_shutdown()");
@ -3707,7 +3707,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n)
}
spin_unlock_irq(&n->list_lock);
list_for_each_entry_safe(page, h, &discard, lru)
list_for_each_entry_safe(page, h, &discard, slab_list)
discard_slab(s, page);
}
@ -3987,7 +3987,7 @@ int __kmem_cache_shrink(struct kmem_cache *s)
* Note that concurrent frees may occur while we hold the
* list_lock. page->inuse here is the upper limit.
*/
list_for_each_entry_safe(page, t, &n->partial, lru) {
list_for_each_entry_safe(page, t, &n->partial, slab_list) {
int free = page->objects - page->inuse;
/* Do not reread page->inuse */
@ -3997,10 +3997,10 @@ int __kmem_cache_shrink(struct kmem_cache *s)
BUG_ON(free <= 0);
if (free == page->objects) {
list_move(&page->lru, &discard);
list_move(&page->slab_list, &discard);
n->nr_partial--;
} else if (free <= SHRINK_PROMOTE_MAX)
list_move(&page->lru, promote + free - 1);
list_move(&page->slab_list, promote + free - 1);
}
/*
@ -4013,7 +4013,7 @@ int __kmem_cache_shrink(struct kmem_cache *s)
spin_unlock_irqrestore(&n->list_lock, flags);
/* Release empty slabs */
list_for_each_entry_safe(page, t, &discard, lru)
list_for_each_entry_safe(page, t, &discard, slab_list)
discard_slab(s, page);
if (slabs_node(s, node))
@ -4205,11 +4205,11 @@ static struct kmem_cache * __init bootstrap(struct kmem_cache *static_cache)
for_each_kmem_cache_node(s, node, n) {
struct page *p;
list_for_each_entry(p, &n->partial, lru)
list_for_each_entry(p, &n->partial, slab_list)
p->slab_cache = s;
#ifdef CONFIG_SLUB_DEBUG
list_for_each_entry(p, &n->full, lru)
list_for_each_entry(p, &n->full, slab_list)
p->slab_cache = s;
#endif
}
@ -4426,7 +4426,7 @@ static int validate_slab_node(struct kmem_cache *s,
spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, lru) {
list_for_each_entry(page, &n->partial, slab_list) {
validate_slab_slab(s, page, map);
count++;
}
@ -4437,7 +4437,7 @@ static int validate_slab_node(struct kmem_cache *s,
if (!(s->flags & SLAB_STORE_USER))
goto out;
list_for_each_entry(page, &n->full, lru) {
list_for_each_entry(page, &n->full, slab_list) {
validate_slab_slab(s, page, map);
count++;
}
@ -4633,9 +4633,9 @@ static int list_locations(struct kmem_cache *s, char *buf,
continue;
spin_lock_irqsave(&n->list_lock, flags);
list_for_each_entry(page, &n->partial, lru)
list_for_each_entry(page, &n->partial, slab_list)
process_slab(&t, s, page, alloc, map);
list_for_each_entry(page, &n->full, lru)
list_for_each_entry(page, &n->full, slab_list)
process_slab(&t, s, page, alloc, map);
spin_unlock_irqrestore(&n->list_lock, flags);
}