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BACKPORT: FROMLIST: mm, memcg: inline mem_cgroup_{charge/uncharge} to improve disabled memcg config

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Inline mem_cgroup_{charge/uncharge} and mem_cgroup_uncharge_list functions
functions to perform mem_cgroup_disabled static key check inline before
calling the main body of the function. This minimizes the memcg overhead
in the pagefault and exit_mmap paths when memcgs are disabled using
cgroup_disable=memory command-line option.
This change results in ~0.4% overhead reduction when running PFT test [1]
comparing {CONFIG_MEMCG=n} against {CONFIG_MEMCG=y, cgroup_disable=memory}
configuration on an 8-core ARM64 Android device.

[1] https://lkml.org/lkml/2006/8/29/294 also used in mmtests suite

Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>

Conflicts:
        include/linux/memcontrol.h
        mm/memcontrol.c

1. Trivial merge conflicts in memcontrol.h
2. Did not need to rename __mem_cgroup_charge into memcg_charge as in the
upstream version since in 5.10 __mem_cgroup_charge did not exist

Link: https://lore.kernel.org/patchwork/patch/1458907/
Bug: 191223209
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I9aad72aeabec2fe01f7218d629ec545c47b5d2c3
This commit is contained in:
Suren Baghdasaryan 2021-07-03 16:11:33 -07:00
parent f73d029485
commit 3ae8e2f183
2 changed files with 33 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
include/linux/memcontrol.h
View File

@ -441,10 +441,31 @@ static inline bool mem_cgroup_below_min(struct mem_cgroup *memcg)
page_counter_read(&memcg->memory);
}
int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask);
int __mem_cgroup_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask);
static inline int mem_cgroup_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
if (mem_cgroup_disabled())
return 0;
return __mem_cgroup_charge(page, mm, gfp_mask);
}
void mem_cgroup_uncharge(struct page *page);
void mem_cgroup_uncharge_list(struct list_head *page_list);
void __mem_cgroup_uncharge(struct page *page);
static inline void mem_cgroup_uncharge(struct page *page)
{
if (mem_cgroup_disabled())
return;
__mem_cgroup_uncharge(page);
}
void __mem_cgroup_uncharge_list(struct list_head *page_list);
static inline void mem_cgroup_uncharge_list(struct list_head *page_list)
{
if (mem_cgroup_disabled())
return;
__mem_cgroup_uncharge_list(page_list);
}
void mem_cgroup_migrate(struct page *oldpage, struct page *newpage);

26
mm/memcontrol.c
View File

@ -6761,7 +6761,7 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root,
}
/**
* mem_cgroup_charge - charge a newly allocated page to a cgroup
* __mem_cgroup_charge - charge a newly allocated page to a cgroup
* @page: page to charge
* @mm: mm context of the victim
* @gfp_mask: reclaim mode
@ -6771,15 +6771,13 @@ void mem_cgroup_calculate_protection(struct mem_cgroup *root,
*
* Returns 0 on success. Otherwise, an error code is returned.
*/
int mem_cgroup_charge(struct page *page, struct mm_struct *mm, gfp_t gfp_mask)
int __mem_cgroup_charge(struct page *page, struct mm_struct *mm,
gfp_t gfp_mask)
{
unsigned int nr_pages = thp_nr_pages(page);
struct mem_cgroup *memcg = NULL;
int ret = 0;
if (mem_cgroup_disabled())
goto out;
if (PageSwapCache(page)) {
swp_entry_t ent = { .val = page_private(page), };
unsigned short id;
@ -6949,18 +6947,15 @@ static void uncharge_list(struct list_head *page_list)
}
/**
* mem_cgroup_uncharge - uncharge a page
* __mem_cgroup_uncharge - uncharge a page
* @page: page to uncharge
*
* Uncharge a page previously charged with mem_cgroup_charge().
* Uncharge a page previously charged with __mem_cgroup_charge().
*/
void mem_cgroup_uncharge(struct page *page)
void __mem_cgroup_uncharge(struct page *page)
{
struct uncharge_gather ug;
if (mem_cgroup_disabled())
return;
/* Don't touch page->lru of any random page, pre-check: */
if (!page->mem_cgroup)
return;
@ -6971,17 +6966,14 @@ void mem_cgroup_uncharge(struct page *page)
}
/**
* mem_cgroup_uncharge_list - uncharge a list of page
* __mem_cgroup_uncharge_list - uncharge a list of page
* @page_list: list of pages to uncharge
*
* Uncharge a list of pages previously charged with
* mem_cgroup_charge().
* __mem_cgroup_charge().
*/
void mem_cgroup_uncharge_list(struct list_head *page_list)
void __mem_cgroup_uncharge_list(struct list_head *page_list)
{
if (mem_cgroup_disabled())
return;
if (!list_empty(page_list))
uncharge_list(page_list);
}