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mm: kmem: rename memcg_kmem_(un)charge() into memcg_kmem_(un)charge_page()

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Rename (__)memcg_kmem_(un)charge() into (__)memcg_kmem_(un)charge_page()
to better reflect what they are actually doing:

1) call __memcg_kmem_(un)charge_memcg() to actually charge or uncharge
   the current memcg

2) set or clear the PageKmemcg flag

Signed-off-by: Roman Gushchin <guro@fb.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Link: http://lkml.kernel.org/r/20200109202659.752357-4-guro@fb.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Roman Gushchin 2020-04-01 21:06:46 -07:00 • committed by Linus Torvalds
parent 50591183fa
commit f4b00eab50
5 changed files with 25 additions and 21 deletions
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9
kernel/fork.c
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@ -281,7 +281,7 @@ static inline void free_thread_stack(struct task_struct *tsk)
MEMCG_KERNEL_STACK_KB,
-(int)(PAGE_SIZE / 1024));
memcg_kmem_uncharge(vm->pages[i], 0);
memcg_kmem_uncharge_page(vm->pages[i], 0);
}
for (i = 0; i < NR_CACHED_STACKS; i++) {
@ -413,12 +413,13 @@ static int memcg_charge_kernel_stack(struct task_struct *tsk)
for (i = 0; i < THREAD_SIZE / PAGE_SIZE; i++) {
/*
* If memcg_kmem_charge() fails, page->mem_cgroup
* pointer is NULL, and both memcg_kmem_uncharge()
* If memcg_kmem_charge_page() fails, page->mem_cgroup
* pointer is NULL, and both memcg_kmem_uncharge_page()
* and mod_memcg_page_state() in free_thread_stack()
* will ignore this page. So it's safe.
*/
ret = memcg_kmem_charge(vm->pages[i], GFP_KERNEL, 0);
ret = memcg_kmem_charge_page(vm->pages[i], GFP_KERNEL,
0);
if (ret)
return ret;