We have only a few places where we actually want to charge kmem so
instead of intruding into the general page allocation path with
__GFP_KMEMCG it's better to explictly charge kmem there. All kmem
charges will be easier to follow that way.
This is a step toward removing __GFP_KMEMCG. It makes fork charge task
threadinfo pages explicitly instead of passing __GFP_KMEMCG to
alloc_pages.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxx>
---
kernel/fork.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index f4b09bc15f3a..8209780cf732 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -150,15 +150,22 @@ void __weak arch_release_thread_info(struct thread_info *ti)
static struct thread_info *alloc_thread_info_node(struct task_struct *tsk,
int node)
{
- struct page *page = alloc_pages_node(node, THREADINFO_GFP_ACCOUNTED,
- THREAD_SIZE_ORDER);
+ struct page *page;
+ struct mem_cgroup *memcg = NULL;
+ if (!memcg_kmem_newpage_charge(THREADINFO_GFP_ACCOUNTED, &memcg,
+ THREAD_SIZE_ORDER))
+ return NULL;
+ page = alloc_pages_node(node, THREADINFO_GFP, THREAD_SIZE_ORDER);
+ memcg_kmem_commit_charge(page, memcg, THREAD_SIZE_ORDER);
return page ? page_address(page) : NULL;
}
static inline void free_thread_info(struct thread_info *ti)
{
- free_memcg_kmem_pages((unsigned long)ti, THREAD_SIZE_ORDER);
+ if (ti)
+ memcg_kmem_uncharge_pages(virt_to_page(ti), THREAD_SIZE_ORDER);
+ free_pages((unsigned long)ti, THREAD_SIZE_ORDER);
}
# else
static struct kmem_cache *thread_info_cache;
--
1.7.10.4
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