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Commit 2a7106f2 authored by Greg Thelen's avatar Greg Thelen Committed by Linus Torvalds
Browse files

memcg: create extensible page stat update routines 



Replace usage of the mem_cgroup_update_file_mapped() memcg
statistic update routine with two new routines:
* mem_cgroup_inc_page_stat()
* mem_cgroup_dec_page_stat()

As before, only the file_mapped statistic is managed.  However, these more
general interfaces allow for new statistics to be more easily added.  New
statistics are added with memcg dirty page accounting.

Signed-off-by: default avatarGreg Thelen <gthelen@google.com>
Signed-off-by: default avatarAndrea Righi <arighi@develer.com>
Acked-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Acked-by: default avatarDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent ece72400

include/linux/memcontrol.h

+28 −3
Original line number Diff line number Diff line
@@ -25,6 +25,11 @@ struct page_cgroup; 
struct page;

struct mm_struct;



/* Stats that can be updated by kernel. */

enum mem_cgroup_page_stat_item {

	MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */

};



extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,

					struct list_head *dst,

					unsigned long *scanned, int order,
@@ -121,7 +126,22 @@ static inline bool mem_cgroup_disabled(void) 
	return false;

}



void mem_cgroup_update_file_mapped(struct page *page, int val);

void mem_cgroup_update_page_stat(struct page *page,

				 enum mem_cgroup_page_stat_item idx,

				 int val);



static inline void mem_cgroup_inc_page_stat(struct page *page,

					    enum mem_cgroup_page_stat_item idx)

{

	mem_cgroup_update_page_stat(page, idx, 1);

}



static inline void mem_cgroup_dec_page_stat(struct page *page,

					    enum mem_cgroup_page_stat_item idx)

{

	mem_cgroup_update_page_stat(page, idx, -1);

}



unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,

						gfp_t gfp_mask);

u64 mem_cgroup_get_limit(struct mem_cgroup *mem);
@@ -293,8 +313,13 @@ mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) 
{

}



static inline void mem_cgroup_update_file_mapped(struct page *page,

							int val)

static inline void mem_cgroup_inc_page_stat(struct page *page,

					    enum mem_cgroup_page_stat_item idx)

{

}



static inline void mem_cgroup_dec_page_stat(struct page *page,

					    enum mem_cgroup_page_stat_item idx)

{

}

mm/memcontrol.c

+7 −9
Original line number Diff line number Diff line
@@ -1600,7 +1600,8 @@ bool mem_cgroup_handle_oom(struct mem_cgroup *mem, gfp_t mask) 
 * possibility of race condition. If there is, we take a lock.

 */



static void mem_cgroup_update_file_stat(struct page *page, int idx, int val)

void mem_cgroup_update_page_stat(struct page *page,

				 enum mem_cgroup_page_stat_item idx, int val)

{

	struct mem_cgroup *mem;

	struct page_cgroup *pc = lookup_page_cgroup(page);
@@ -1623,30 +1624,27 @@ static void mem_cgroup_update_file_stat(struct page *page, int idx, int val) 
			goto out;

	}



	this_cpu_add(mem->stat->count[idx], val);



	switch (idx) {

	case MEM_CGROUP_STAT_FILE_MAPPED:

	case MEMCG_NR_FILE_MAPPED:

		if (val > 0)

			SetPageCgroupFileMapped(pc);

		else if (!page_mapped(page))

			ClearPageCgroupFileMapped(pc);

		idx = MEM_CGROUP_STAT_FILE_MAPPED;

		break;

	default:

		BUG();

	}



	this_cpu_add(mem->stat->count[idx], val);



out:

	if (unlikely(need_unlock))

		unlock_page_cgroup(pc);

	rcu_read_unlock();

	return;

}



void mem_cgroup_update_file_mapped(struct page *page, int val)

{

	mem_cgroup_update_file_stat(page, MEM_CGROUP_STAT_FILE_MAPPED, val);

}

EXPORT_SYMBOL(mem_cgroup_update_page_stat);



/*

 * size of first charge trial. "32" comes from vmscan.c's magic value.

mm/rmap.c

+2 −2
Original line number Diff line number Diff line
@@ -937,7 +937,7 @@ void page_add_file_rmap(struct page *page) 
{

	if (atomic_inc_and_test(&page->_mapcount)) {

		__inc_zone_page_state(page, NR_FILE_MAPPED);

		mem_cgroup_update_file_mapped(page, 1);

		mem_cgroup_inc_page_stat(page, MEMCG_NR_FILE_MAPPED);

	}

}
@@ -979,7 +979,7 @@ void page_remove_rmap(struct page *page) 
					      NR_ANON_TRANSPARENT_HUGEPAGES);

	} else {

		__dec_zone_page_state(page, NR_FILE_MAPPED);

		mem_cgroup_update_file_mapped(page, -1);

		mem_cgroup_dec_page_stat(page, MEMCG_NR_FILE_MAPPED);

	}

	/*

	 * It would be tidy to reset the PageAnon mapping here,