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Subject[PATCH v2 4/6] mm: unify SLAB and SLUB page accounting
Date
Currently the page accounting code is duplicated in SLAB and SLUB
internals. Let's move it into new (un)charge_slab_page helpers
in the slab_common.c file. These helpers will be responsible
for statistics (global and memcg-aware) and memcg charging.
So they are replacing direct memcg_(un)charge_slab() calls.

Signed-off-by: Roman Gushchin <guro@fb.com>
---
mm/slab.c | 19 +++----------------
mm/slab.h | 22 ++++++++++++++++++++++
mm/slub.c | 14 ++------------
3 files changed, 27 insertions(+), 28 deletions(-)

diff --git a/mm/slab.c b/mm/slab.c
index 14466a73d057..53e6b2687102 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1389,7 +1389,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
int nodeid)
{
struct page *page;
- int nr_pages;

flags |= cachep->allocflags;

@@ -1399,17 +1398,11 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
return NULL;
}

- if (memcg_charge_slab(page, flags, cachep->gfporder, cachep)) {
+ if (charge_slab_page(page, flags, cachep->gfporder, cachep)) {
__free_pages(page, cachep->gfporder);
return NULL;
}

- nr_pages = (1 << cachep->gfporder);
- if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
- mod_lruvec_page_state(page, NR_SLAB_RECLAIMABLE, nr_pages);
- else
- mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE, nr_pages);
-
__SetPageSlab(page);
/* Record if ALLOC_NO_WATERMARKS was set when allocating the slab */
if (sk_memalloc_socks() && page_is_pfmemalloc(page))
@@ -1424,12 +1417,6 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
{
int order = cachep->gfporder;
- unsigned long nr_freed = (1 << order);
-
- if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
- mod_lruvec_page_state(page, NR_SLAB_RECLAIMABLE, -nr_freed);
- else
- mod_lruvec_page_state(page, NR_SLAB_UNRECLAIMABLE, -nr_freed);

BUG_ON(!PageSlab(page));
__ClearPageSlabPfmemalloc(page);
@@ -1438,8 +1425,8 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
page->mapping = NULL;

if (current->reclaim_state)
- current->reclaim_state->reclaimed_slab += nr_freed;
- memcg_uncharge_slab(page, order, cachep);
+ current->reclaim_state->reclaimed_slab += 1 << order;
+ uncharge_slab_page(page, order, cachep);
__free_pages(page, order);
}

diff --git a/mm/slab.h b/mm/slab.h
index 4a261c97c138..0f5c5444acf1 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -205,6 +205,12 @@ ssize_t slabinfo_write(struct file *file, const char __user *buffer,
void __kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
int __kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);

+static inline int cache_vmstat_idx(struct kmem_cache *s)
+{
+ return (s->flags & SLAB_RECLAIM_ACCOUNT) ?
+ NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE;
+}
+
#ifdef CONFIG_MEMCG_KMEM

/* List of all root caches. */
@@ -352,6 +358,22 @@ static inline void memcg_link_cache(struct kmem_cache *s,

#endif /* CONFIG_MEMCG_KMEM */

+static __always_inline int charge_slab_page(struct page *page,
+ gfp_t gfp, int order,
+ struct kmem_cache *s)
+{
+ memcg_charge_slab(page, gfp, order, s);
+ mod_lruvec_page_state(page, cache_vmstat_idx(s), 1 << order);
+ return 0;
+}
+
+static __always_inline void uncharge_slab_page(struct page *page, int order,
+ struct kmem_cache *s)
+{
+ mod_lruvec_page_state(page, cache_vmstat_idx(s), -(1 << order));
+ memcg_uncharge_slab(page, order, s);
+}
+
static inline struct kmem_cache *cache_from_obj(struct kmem_cache *s, void *x)
{
struct kmem_cache *cachep;
diff --git a/mm/slub.c b/mm/slub.c
index 195f61785c7d..90563c0b3b5f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1499,7 +1499,7 @@ static inline struct page *alloc_slab_page(struct kmem_cache *s,
else
page = __alloc_pages_node(node, flags, order);

- if (page && memcg_charge_slab(page, flags, order, s)) {
+ if (page && charge_slab_page(page, flags, order, s)) {
__free_pages(page, order);
page = NULL;
}
@@ -1692,11 +1692,6 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
if (!page)
return NULL;

- mod_lruvec_page_state(page,
- (s->flags & SLAB_RECLAIM_ACCOUNT) ?
- NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
- 1 << oo_order(oo));
-
inc_slabs_node(s, page_to_nid(page), page->objects);

return page;
@@ -1730,18 +1725,13 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
check_object(s, page, p, SLUB_RED_INACTIVE);
}

- mod_lruvec_page_state(page,
- (s->flags & SLAB_RECLAIM_ACCOUNT) ?
- NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE,
- -pages);
-
__ClearPageSlabPfmemalloc(page);
__ClearPageSlab(page);

page->mapping = NULL;
if (current->reclaim_state)
current->reclaim_state->reclaimed_slab += pages;
- memcg_uncharge_slab(page, order, s);
+ uncharge_slab_page(page, order, s);
__free_pages(page, order);
}

--
2.20.1
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