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From: Roman Gushchin <guro@fb.com>
To: <linux-mm@kvack.org>, Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Shakeel Butt <shakeelb@google.com>,
	Vladimir Davydov <vdavydov.dev@gmail.com>,
	<linux-kernel@vger.kernel.org>, <kernel-team@fb.com>,
	Roman Gushchin <guro@fb.com>
Subject: [PATCH v2 4/6] mm: kmem: switch to nr_pages in (__)memcg_kmem_charge_memcg()
Date: Thu, 9 Jan 2020 12:26:57 -0800
Message-ID: <20200109202659.752357-5-guro@fb.com> (raw)
In-Reply-To: <20200109202659.752357-1-guro@fb.com>

These functions are charging the given number of kernel pages to the
given memory cgroup. The number doesn't have to be a power of two.
Let's make them to take the unsigned int nr_pages as an argument
instead of the page order.

It makes them look consistent with the corresponding uncharge
functions and functions like: mem_cgroup_charge_skmem(memcg, nr_pages).

Signed-off-by: Roman Gushchin <guro@fb.com>
---
 include/linux/memcontrol.h | 11 ++++++-----
 mm/memcontrol.c            |  8 ++++----
 mm/slab.h                  |  2 +-
 3 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h
index 4ee0c345e905..851c373edb74 100644
--- a/include/linux/memcontrol.h
+++ b/include/linux/memcontrol.h
@@ -1364,7 +1364,8 @@ void memcg_kmem_put_cache(struct kmem_cache *cachep);
 #ifdef CONFIG_MEMCG_KMEM
 int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order);
 void __memcg_kmem_uncharge_page(struct page *page, int order);
-int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, int order);
+int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp,
+			      unsigned int nr_pages);
 void __memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg,
 				 unsigned int nr_pages);
 
@@ -1403,18 +1404,18 @@ static inline void memcg_kmem_uncharge_page(struct page *page, int order)
 }
 
 static inline int memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp,
-					  int order)
+					  unsigned int nr_pages)
 {
 	if (memcg_kmem_enabled())
-		return __memcg_kmem_charge_memcg(memcg, gfp, order);
+		return __memcg_kmem_charge_memcg(memcg, gfp, nr_pages);
 	return 0;
 }
 
 static inline void memcg_kmem_uncharge_memcg(struct mem_cgroup *memcg,
-					     int order)
+					     unsigned int nr_pages)
 {
 	if (memcg_kmem_enabled())
-		__memcg_kmem_uncharge_memcg(memcg, 1 << order);
+		__memcg_kmem_uncharge_memcg(memcg, nr_pages);
 }
 
 /*
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 6bdf040e4615..8dbfb9fed9d8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2822,13 +2822,13 @@ void memcg_kmem_put_cache(struct kmem_cache *cachep)
  * __memcg_kmem_charge_memcg: charge a kmem page
  * @memcg: memory cgroup to charge
  * @gfp: reclaim mode
- * @order: allocation order
+ * @nr_pages: number of pages to charge
  *
  * Returns 0 on success, an error code on failure.
  */
-int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp, int order)
+int __memcg_kmem_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp,
+			      unsigned int nr_pages)
 {
-	unsigned int nr_pages = 1 << order;
 	struct page_counter *counter;
 	int ret;
 
@@ -2872,7 +2872,7 @@ int __memcg_kmem_charge_page(struct page *page, gfp_t gfp, int order)
 
 	memcg = get_mem_cgroup_from_current();
 	if (!mem_cgroup_is_root(memcg)) {
-		ret = __memcg_kmem_charge_memcg(memcg, gfp, order);
+		ret = __memcg_kmem_charge_memcg(memcg, gfp, 1 << order);
 		if (!ret) {
 			page->mem_cgroup = memcg;
 			__SetPageKmemcg(page);
diff --git a/mm/slab.h b/mm/slab.h
index e7da63fb8211..d96c87a30a9b 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -365,7 +365,7 @@ static __always_inline int memcg_charge_slab(struct page *page,
 		return 0;
 	}
 
-	ret = memcg_kmem_charge_memcg(memcg, gfp, order);
+	ret = memcg_kmem_charge_memcg(memcg, gfp, 1 << order);
 	if (ret)
 		goto out;
 
-- 
2.21.1



  parent reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-09 20:26 [PATCH v2 0/6] mm: memcg: kmem API cleanup Roman Gushchin
2020-01-09 20:26 ` [PATCH v2 1/6] mm: kmem: cleanup (__)memcg_kmem_charge_memcg() arguments Roman Gushchin
2020-01-11  0:23   ` Shakeel Butt
2020-01-16 16:42   ` Johannes Weiner
2020-01-09 20:26 ` [PATCH v2 2/6] mm: kmem: cleanup memcg_kmem_uncharge_memcg() arguments Roman Gushchin
2020-01-11  0:23   ` Shakeel Butt
2020-01-13 15:11     ` Roman Gushchin
2020-01-16 16:44   ` Johannes Weiner
2020-01-09 20:26 ` [PATCH v2 3/6] mm: kmem: rename memcg_kmem_(un)charge() into memcg_kmem_(un)charge_page() Roman Gushchin
2020-01-11  0:25   ` Shakeel Butt
2020-01-16 16:47   ` Johannes Weiner
2020-01-09 20:26 ` Roman Gushchin [this message]
2020-01-11  0:27   ` [PATCH v2 4/6] mm: kmem: switch to nr_pages in (__)memcg_kmem_charge_memcg() Shakeel Butt
2020-01-16 17:24   ` Johannes Weiner
2020-01-09 20:26 ` [PATCH v2 5/6] mm: memcg/slab: cache page number in memcg_(un)charge_slab() Roman Gushchin
2020-01-11  0:28   ` Shakeel Butt
2020-01-16 17:26   ` Johannes Weiner
2020-01-09 20:26 ` [PATCH v2 6/6] mm: kmem: rename (__)memcg_kmem_(un)charge_memcg() to __memcg_kmem_(un)charge() Roman Gushchin
2020-01-11  0:32   ` Shakeel Butt
2020-01-16 17:30   ` Johannes Weiner
2020-01-16 17:40     ` Roman Gushchin

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