Commit 941ce635 authored by Roman Gushchin's avatar Roman Gushchin Committed by Andrew Morton
Browse files

mm: page_counters: put page_counter_calculate_protection() under CONFIG_MEMCG 

Put page_counter_calculate_protection() under CONFIG_MEMCG.

The protection functionality (min/low limits) is not supported by any
other cgroup subsystem, so page_counter_calculate_protection() and related
static effective_protection() can be compiled out if CONFIG_MEMCG is not
enabled.

Link: https://lkml.kernel.org/r/20240726203110.1577216-3-roman.gushchin@linux.dev


Signed-off-by: default avatarRoman Gushchin <roman.gushchin@linux.dev>
Acked-by: default avatarShakeel Butt <shakeel.butt@linux.dev>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent f77bd4b1

include/linux/page_counter.h

+6 −0
Original line number Diff line number Diff line
@@ -87,8 +87,14 @@ static inline void page_counter_reset_watermark(struct page_counter *counter) 
	counter->watermark = page_counter_read(counter);

}



#ifdef CONFIG_MEMCG

void page_counter_calculate_protection(struct page_counter *root,

				       struct page_counter *counter,

				       bool recursive_protection);

#else

static inline void page_counter_calculate_protection(struct page_counter *root,

						     struct page_counter *counter,

						     bool recursive_protection) {}

#endif



#endif /* _LINUX_PAGE_COUNTER_H */

mm/page_counter.c

+2 −0
Original line number Diff line number Diff line
@@ -275,6 +275,7 @@ int page_counter_memparse(const char *buf, const char *max, 
}





#ifdef CONFIG_MEMCG

/*

 * This function calculates an individual page counter's effective

 * protection which is derived from its own memory.min/low, its
@@ -446,3 +447,4 @@ void page_counter_calculate_protection(struct page_counter *root, 
			atomic_long_read(&parent->children_low_usage),

			recursive_protection));

}

#endif /* CONFIG_MEMCG */