mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Shakeel Butt](/assets/img/avatar_default.png)
There are three users (mmzone.h, memcontrol.h, page_counter.h) using similar code for forcing cacheline padding between fields of different structures. Dedup that code. Link: https://lkml.kernel.org/r/20220826230642.566725-1-shakeelb@google.com Signed-off-by: Shakeel Butt <shakeelb@google.com> Suggested-by: Feng Tang <feng.tang@intel.com> Reviewed-by: Feng Tang <feng.tang@intel.com> Acked-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_PAGE_COUNTER_H
|
|
#define _LINUX_PAGE_COUNTER_H
|
|
|
|
#include <linux/atomic.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/kernel.h>
|
|
#include <asm/page.h>
|
|
|
|
struct page_counter {
|
|
/*
|
|
* Make sure 'usage' does not share cacheline with any other field. The
|
|
* memcg->memory.usage is a hot member of struct mem_cgroup.
|
|
*/
|
|
atomic_long_t usage;
|
|
CACHELINE_PADDING(_pad1_);
|
|
|
|
/* effective memory.min and memory.min usage tracking */
|
|
unsigned long emin;
|
|
atomic_long_t min_usage;
|
|
atomic_long_t children_min_usage;
|
|
|
|
/* effective memory.low and memory.low usage tracking */
|
|
unsigned long elow;
|
|
atomic_long_t low_usage;
|
|
atomic_long_t children_low_usage;
|
|
|
|
unsigned long watermark;
|
|
unsigned long failcnt;
|
|
|
|
/* Keep all the read most fields in a separete cacheline. */
|
|
CACHELINE_PADDING(_pad2_);
|
|
|
|
unsigned long min;
|
|
unsigned long low;
|
|
unsigned long high;
|
|
unsigned long max;
|
|
struct page_counter *parent;
|
|
} ____cacheline_internodealigned_in_smp;
|
|
|
|
#if BITS_PER_LONG == 32
|
|
#define PAGE_COUNTER_MAX LONG_MAX
|
|
#else
|
|
#define PAGE_COUNTER_MAX (LONG_MAX / PAGE_SIZE)
|
|
#endif
|
|
|
|
static inline void page_counter_init(struct page_counter *counter,
|
|
struct page_counter *parent)
|
|
{
|
|
atomic_long_set(&counter->usage, 0);
|
|
counter->max = PAGE_COUNTER_MAX;
|
|
counter->parent = parent;
|
|
}
|
|
|
|
static inline unsigned long page_counter_read(struct page_counter *counter)
|
|
{
|
|
return atomic_long_read(&counter->usage);
|
|
}
|
|
|
|
void page_counter_cancel(struct page_counter *counter, unsigned long nr_pages);
|
|
void page_counter_charge(struct page_counter *counter, unsigned long nr_pages);
|
|
bool page_counter_try_charge(struct page_counter *counter,
|
|
unsigned long nr_pages,
|
|
struct page_counter **fail);
|
|
void page_counter_uncharge(struct page_counter *counter, unsigned long nr_pages);
|
|
void page_counter_set_min(struct page_counter *counter, unsigned long nr_pages);
|
|
void page_counter_set_low(struct page_counter *counter, unsigned long nr_pages);
|
|
|
|
static inline void page_counter_set_high(struct page_counter *counter,
|
|
unsigned long nr_pages)
|
|
{
|
|
WRITE_ONCE(counter->high, nr_pages);
|
|
}
|
|
|
|
int page_counter_set_max(struct page_counter *counter, unsigned long nr_pages);
|
|
int page_counter_memparse(const char *buf, const char *max,
|
|
unsigned long *nr_pages);
|
|
|
|
static inline void page_counter_reset_watermark(struct page_counter *counter)
|
|
{
|
|
counter->watermark = page_counter_read(counter);
|
|
}
|
|
|
|
#endif /* _LINUX_PAGE_COUNTER_H */
|