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Commit 7f016ee8 authored by KOSAKI Motohiro's avatar KOSAKI Motohiro Committed by Linus Torvalds
Browse files

memcg: show reclaim stat 



Add the following four fields to memory.stat file:

  - inactive_ratio
  - recent_rotated_anon
  - recent_rotated_file
  - recent_scanned_anon
  - recent_scanned_file

Acked-by: default avatarRik van Riel <riel@redhat.com>
Signed-off-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: default avatarKOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9439c1c9

Documentation/controllers/memory.txt

+25 −0
Original line number Diff line number Diff line
@@ -289,6 +289,31 @@ will be charged as a new owner of it. 
  Because rmdir() moves all pages to parent, some out-of-use page caches can be

  moved to the parent. If you want to avoid that, force_empty will be useful.



5.2 stat file

  memory.stat file includes following statistics (now)

	cache			- # of pages from page-cache and shmem.

	rss			- # of pages from anonymous memory.

	pgpgin			- # of event of charging

	pgpgout			- # of event of uncharging

	active_anon		- # of pages on active lru of anon, shmem.

	inactive_anon 		- # of pages on active lru of anon, shmem

	active_file		- # of pages on active lru of file-cache

	inactive_file		- # of pages on inactive lru of file cache

	unevictable		- # of pages cannot be reclaimed.(mlocked etc)



	Below is depend on CONFIG_DEBUG_VM.

	inactive_ratio		- VM inernal parameter. (see mm/page_alloc.c)

	recent_rotated_anon	- VM internal parameter. (see mm/vmscan.c)

	recent_rotated_file	- VM internal parameter. (see mm/vmscan.c)

	recent_scanned_anon 	- VM internal parameter. (see mm/vmscan.c)

	recent_scanned_file 	- VM internal parameter. (see mm/vmscan.c)



  Memo:

	recent_rotated means recent frequency of lru rotation.

	recent_scanned means recent # of scans to lru.

	showing for better debug please see the code for meanings.





6. Hierarchy support



The memory controller supports a deep hierarchy and hierarchical accounting.

mm/memcontrol.c

+30 −0
Original line number Diff line number Diff line
@@ -1816,6 +1816,36 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft, 
		cb->fill(cb, "unevictable", unevictable * PAGE_SIZE);



	}



#ifdef CONFIG_DEBUG_VM

	cb->fill(cb, "inactive_ratio", mem_cont->inactive_ratio);



	{

		int nid, zid;

		struct mem_cgroup_per_zone *mz;

		unsigned long recent_rotated[2] = {0, 0};

		unsigned long recent_scanned[2] = {0, 0};



		for_each_online_node(nid)

			for (zid = 0; zid < MAX_NR_ZONES; zid++) {

				mz = mem_cgroup_zoneinfo(mem_cont, nid, zid);



				recent_rotated[0] +=

					mz->reclaim_stat.recent_rotated[0];

				recent_rotated[1] +=

					mz->reclaim_stat.recent_rotated[1];

				recent_scanned[0] +=

					mz->reclaim_stat.recent_scanned[0];

				recent_scanned[1] +=

					mz->reclaim_stat.recent_scanned[1];

			}

		cb->fill(cb, "recent_rotated_anon", recent_rotated[0]);

		cb->fill(cb, "recent_rotated_file", recent_rotated[1]);

		cb->fill(cb, "recent_scanned_anon", recent_scanned[0]);

		cb->fill(cb, "recent_scanned_file", recent_scanned[1]);

	}

#endif



	return 0;

}