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FROMLIST: mm, memcg: inline swap-related functions to improve disabled memcg config

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Inline mem_cgroup_try_charge_swap, mem_cgroup_uncharge_swap and
cgroup_throttle_swaprate 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 ~1% 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: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Michal Hocko <mhocko@suse.com>

Link: https://lore.kernel.org/patchwork/patch/1458908/
Bug: 191223209
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: I18d59090ec908037b39324d1f1bb511d06e9c690
This commit is contained in:
Suren Baghdasaryan
2021-07-05 16:06:17 -07:00
parent 3ae8e2f183
commit 309aa7e7a2
3 changed files with 28 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

26
include/linux/swap.h
View File

@@ -695,7 +695,13 @@ static inline int mem_cgroup_swappiness(struct mem_cgroup *mem)
#endif
#if defined(CONFIG_SWAP) && defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
extern void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask);
extern void __cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask);
static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
{
if (mem_cgroup_disabled())
return;
__cgroup_throttle_swaprate(page, gfp_mask);
}
#else
static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
{
@@ -704,8 +710,22 @@ static inline void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
#ifdef CONFIG_MEMCG_SWAP
extern void mem_cgroup_swapout(struct page *page, swp_entry_t entry);
extern int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry);
extern void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages);
extern int __mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry);
static inline int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry)
{
if (mem_cgroup_disabled())
return 0;
return __mem_cgroup_try_charge_swap(page, entry);
}
extern void __mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages);
static inline void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages)
{
if (mem_cgroup_disabled())
return;
__mem_cgroup_uncharge_swap(entry, nr_pages);
}
extern long mem_cgroup_get_nr_swap_pages(struct mem_cgroup *memcg);
extern bool mem_cgroup_swap_full(struct page *page);
#else

14
mm/memcontrol.c
View File

@@ -7252,7 +7252,7 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
}
/**
* mem_cgroup_try_charge_swap - try charging swap space for a page
* __mem_cgroup_try_charge_swap - try charging swap space for a page
* @page: page being added to swap
* @entry: swap entry to charge
*
@@ -7260,16 +7260,13 @@ void mem_cgroup_swapout(struct page *page, swp_entry_t entry)
*
* Returns 0 on success, -ENOMEM on failure.
*/
int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry)
int __mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry)
{
unsigned int nr_pages = thp_nr_pages(page);
struct page_counter *counter;
struct mem_cgroup *memcg;
unsigned short oldid;
if (mem_cgroup_disabled())
return 0;
if (!cgroup_subsys_on_dfl(memory_cgrp_subsys))
return 0;
@@ -7305,18 +7302,15 @@ int mem_cgroup_try_charge_swap(struct page *page, swp_entry_t entry)
}
/**
* mem_cgroup_uncharge_swap - uncharge swap space
* __mem_cgroup_uncharge_swap - uncharge swap space
* @entry: swap entry to uncharge
* @nr_pages: the amount of swap space to uncharge
*/
void mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages)
void __mem_cgroup_uncharge_swap(swp_entry_t entry, unsigned int nr_pages)
{
struct mem_cgroup *memcg;
unsigned short id;
if (mem_cgroup_disabled())
return;
id = swap_cgroup_record(entry, 0, nr_pages);
rcu_read_lock();
memcg = mem_cgroup_from_id(id);

5
mm/swapfile.c
View File

@@ -3813,14 +3813,11 @@ static void free_swap_count_continuations(struct swap_info_struct *si)
}
#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP)
void cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
void __cgroup_throttle_swaprate(struct page *page, gfp_t gfp_mask)
{
struct swap_info_struct *si, *next;
int nid = page_to_nid(page);
if (mem_cgroup_disabled())
return;
if (!(gfp_mask & __GFP_IO))
return;