linux/Documentation/cgroups
Johannes Weiner 9b272977e3 memcg: skip scanning active lists based on individual size
Reclaim decides to skip scanning an active list when the corresponding
inactive list is above a certain size in comparison to leave the assumed
working set alone while there are still enough reclaim candidates around.

The memcg implementation of comparing those lists instead reports whether
the whole memcg is low on the requested type of inactive pages,
considering all nodes and zones.

This can lead to an oversized active list not being scanned because of the
state of the other lists in the memcg, as well as an active list being
scanned while its corresponding inactive list has enough pages.

Not only is this wrong, it's also a scalability hazard, because the global
memory state over all nodes and zones has to be gathered for each memcg
and zone scanned.

Make these calculations purely based on the size of the two LRU lists
that are actually affected by the outcome of the decision.

Signed-off-by: Johannes Weiner <jweiner@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Ying Han <yinghan@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-11-02 16:07:00 -07:00
..
00-INDEX trivial: fix where cgroup documentation is not correctly referred to 2009-03-30 15:22:02 +02:00
blkio-controller.txt Documentation: fix cgroup blkio throttle filenames 2011-07-06 13:17:51 -07:00
cgroup_event_listener.c tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
cgroups.txt Documentation: fix cgroup typos and formatting 2011-06-15 21:52:50 -07:00
cpuacct.txt Documentation: fix echo command in cgroups/cpuacct.txt 2011-07-23 10:58:08 -07:00
cpusets.txt Documentation: fix ambigous text for root cpuset 2011-07-23 10:58:08 -07:00
devices.txt Documentation: update cgroupfs mount point 2011-06-15 21:52:50 -07:00
freezer-subsystem.txt Documentation: update cgroupfs mount point 2011-06-15 21:52:50 -07:00
memcg_test.txt tree-wide: fix comment/printk typos 2010-11-01 15:38:34 -04:00
memory.txt memcg: skip scanning active lists based on individual size 2011-11-02 16:07:00 -07:00
resource_counter.txt res_counter: update documentation 2009-04-13 15:04:30 -07:00