The patch titled
Subject: memcg: localize memcg_kmem_enabled() check
has been added to the -mm tree. Its filename is
memcg-localize-memcg_kmem_enabled-check.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/memcg-localize-memcg_kmem_enabled-check.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/memcg-localize-memcg_kmem_enabled-check.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
Subject: memcg: localize memcg_kmem_enabled() check
Move the memcg_kmem_enabled() checks into memcg kmem charge/uncharge
functions, so, the users don't have to explicitly check that condition.
This is purely code cleanup patch without any functional change. Only the
order of checks in memcg_charge_slab() can potentially be changed but the
functionally it will be same. This should not matter as
memcg_charge_slab() is not in the hot path.
Link: http://lkml.kernel.org/r/20190103161203.162375-1-shakeelb@xxxxxxxxxx
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Roman Gushchin <guro@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/pipe.c | 3 --
include/linux/memcontrol.h | 37 +++++++++++++++++++++++++++++++----
mm/memcontrol.c | 16 +++++++--------
mm/page_alloc.c | 4 +--
mm/slab.h | 4 ---
5 files changed, 44 insertions(+), 20 deletions(-)
--- a/fs/pipe.c~memcg-localize-memcg_kmem_enabled-check
+++ a/fs/pipe.c
@@ -140,8 +140,7 @@ static int anon_pipe_buf_steal(struct pi
struct page *page = buf->page;
if (page_count(page) == 1) {
- if (memcg_kmem_enabled())
- memcg_kmem_uncharge(page, 0);
+ memcg_kmem_uncharge(page, 0);
__SetPageLocked(page);
return 0;
}
--- a/include/linux/memcontrol.h~memcg-localize-memcg_kmem_enabled-check
+++ a/include/linux/memcontrol.h
@@ -1273,12 +1273,12 @@ static inline bool mem_cgroup_under_sock
struct kmem_cache *memcg_kmem_get_cache(struct kmem_cache *cachep);
void memcg_kmem_put_cache(struct kmem_cache *cachep);
-int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
- struct mem_cgroup *memcg);
#ifdef CONFIG_MEMCG_KMEM
-int memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
-void memcg_kmem_uncharge(struct page *page, int order);
+int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order);
+void __memcg_kmem_uncharge(struct page *page, int order);
+int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
+ struct mem_cgroup *memcg);
extern struct static_key_false memcg_kmem_enabled_key;
extern struct workqueue_struct *memcg_kmem_cache_wq;
@@ -1300,6 +1300,26 @@ static inline bool memcg_kmem_enabled(vo
return static_branch_unlikely(&memcg_kmem_enabled_key);
}
+static inline int memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
+{
+ if (memcg_kmem_enabled())
+ return __memcg_kmem_charge(page, gfp, order);
+ return 0;
+}
+
+static inline void memcg_kmem_uncharge(struct page *page, int order)
+{
+ if (memcg_kmem_enabled())
+ __memcg_kmem_uncharge(page, order);
+}
+
+static inline int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp,
+ int order, struct mem_cgroup *memcg)
+{
+ if (memcg_kmem_enabled())
+ return __memcg_kmem_charge_memcg(page, gfp, order, memcg);
+ return 0;
+}
/*
* helper for accessing a memcg's index. It will be used as an index in the
* child cache array in kmem_cache, and also to derive its name. This function
@@ -1325,6 +1345,15 @@ static inline void memcg_kmem_uncharge(s
{
}
+static inline int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
+{
+ return 0;
+}
+
+static inline void __memcg_kmem_uncharge(struct page *page, int order)
+{
+}
+
#define for_each_memcg_cache_index(_idx) \
for (; NULL; )
--- a/mm/memcontrol.c~memcg-localize-memcg_kmem_enabled-check
+++ a/mm/memcontrol.c
@@ -2573,7 +2573,7 @@ void memcg_kmem_put_cache(struct kmem_ca
}
/**
- * memcg_kmem_charge_memcg: charge a kmem page
+ * __memcg_kmem_charge_memcg: charge a kmem page
* @page: page to charge
* @gfp: reclaim mode
* @order: allocation order
@@ -2581,7 +2581,7 @@ void memcg_kmem_put_cache(struct kmem_ca
*
* Returns 0 on success, an error code on failure.
*/
-int memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
+int __memcg_kmem_charge_memcg(struct page *page, gfp_t gfp, int order,
struct mem_cgroup *memcg)
{
unsigned int nr_pages = 1 << order;
@@ -2604,24 +2604,24 @@ int memcg_kmem_charge_memcg(struct page
}
/**
- * memcg_kmem_charge: charge a kmem page to the current memory cgroup
+ * __memcg_kmem_charge: charge a kmem page to the current memory cgroup
* @page: page to charge
* @gfp: reclaim mode
* @order: allocation order
*
* Returns 0 on success, an error code on failure.
*/
-int memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
+int __memcg_kmem_charge(struct page *page, gfp_t gfp, int order)
{
struct mem_cgroup *memcg;
int ret = 0;
- if (mem_cgroup_disabled() || memcg_kmem_bypass())
+ if (memcg_kmem_bypass())
return 0;
memcg = get_mem_cgroup_from_current();
if (!mem_cgroup_is_root(memcg)) {
- ret = memcg_kmem_charge_memcg(page, gfp, order, memcg);
+ ret = __memcg_kmem_charge_memcg(page, gfp, order, memcg);
if (!ret)
__SetPageKmemcg(page);
}
@@ -2629,11 +2629,11 @@ int memcg_kmem_charge(struct page *page,
return ret;
}
/**
- * memcg_kmem_uncharge: uncharge a kmem page
+ * __memcg_kmem_uncharge: uncharge a kmem page
* @page: page to uncharge
* @order: allocation order
*/
-void memcg_kmem_uncharge(struct page *page, int order)
+void __memcg_kmem_uncharge(struct page *page, int order)
{
struct mem_cgroup *memcg = page->mem_cgroup;
unsigned int nr_pages = 1 << order;
--- a/mm/page_alloc.c~memcg-localize-memcg_kmem_enabled-check
+++ a/mm/page_alloc.c
@@ -1053,7 +1053,7 @@ static __always_inline bool free_pages_p
if (PageMappingFlags(page))
page->mapping = NULL;
if (memcg_kmem_enabled() && PageKmemcg(page))
- memcg_kmem_uncharge(page, order);
+ __memcg_kmem_uncharge(page, order);
if (check_free)
bad += free_pages_check(page);
if (bad)
@@ -4667,7 +4667,7 @@ __alloc_pages_nodemask(gfp_t gfp_mask, u
out:
if (memcg_kmem_enabled() && (gfp_mask & __GFP_ACCOUNT) && page &&
- unlikely(memcg_kmem_charge(page, gfp_mask, order) != 0)) {
+ unlikely(__memcg_kmem_charge(page, gfp_mask, order) != 0)) {
__free_pages(page, order);
page = NULL;
}
--- a/mm/slab.h~memcg-localize-memcg_kmem_enabled-check
+++ a/mm/slab.h
@@ -276,8 +276,6 @@ static __always_inline int memcg_charge_
gfp_t gfp, int order,
struct kmem_cache *s)
{
- if (!memcg_kmem_enabled())
- return 0;
if (is_root_cache(s))
return 0;
return memcg_kmem_charge_memcg(page, gfp, order, s->memcg_params.memcg);
@@ -286,8 +284,6 @@ static __always_inline int memcg_charge_
static __always_inline void memcg_uncharge_slab(struct page *page, int order,
struct kmem_cache *s)
{
- if (!memcg_kmem_enabled())
- return;
memcg_kmem_uncharge(page, order);
}
_
Patches currently in -mm which might be from shakeelb@xxxxxxxxxx are
fork-memcg-fix-cached_stacks-case.patch
memcg-localize-memcg_kmem_enabled-check.patch
