Commit 688eb988 authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds
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vmscan: memcg: always use swappiness of the reclaimed memcg 



Memory reclaim always uses swappiness of the reclaim target memcg
(origin of the memory pressure) or vm_swappiness for global memory
reclaim.  This behavior was consistent (except for difference between
global and hard limit reclaim) because swappiness was enforced to be
consistent within each memcg hierarchy.

After "mm: memcontrol: remove hierarchy restrictions for swappiness and
oom_control" each memcg can have its own swappiness independent of
hierarchical parents, though, so the consistency guarantee is gone.
This can lead to an unexpected behavior.  Say that a group is explicitly
configured to not swapout by memory.swappiness=0 but its memory gets
swapped out anyway when the memory pressure comes from its parent with a
It is also unexpected that the knob is meaningless without setting the
hard limit which would trigger the reclaim and enforce the swappiness.
There are setups where the hard limit is configured higher in the
hierarchy by an administrator and children groups are under control of
somebody else who is interested in the swapout behavior but not
necessarily about the memory limit.

From a semantic point of view swappiness is an attribute defining anon
vs.
 file proportional scanning of LRU which is memcg specific (unlike
charges which are propagated up the hierarchy) so it should be applied
to the particular memcg's LRU regardless where the memory pressure comes
from.

This patch removes vmscan_swappiness() and stores the swappiness into
the scan_control structure.  mem_cgroup_swappiness is then used to
provide the correct value before shrink_lruvec is called.  The global
vm_swappiness is used for the root memcg.

[hughd@google.com: oopses immediately when booted with cgroup_disable=memory]
Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: default avatarHugh Dickins <hughd@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 722773af

Documentation/cgroups/memory.txt

+7 −8
Original line number Diff line number Diff line
@@ -540,14 +540,13 @@ Note: 


5.3 swappiness



Similar to /proc/sys/vm/swappiness, but only affecting reclaim that is

triggered by this cgroup's hard limit.  The tunable in the root cgroup

corresponds to the global swappiness setting.



Please note that unlike the global swappiness, memcg knob set to 0

really prevents from any swapping even if there is a swap storage

available. This might lead to memcg OOM killer if there are no file

pages to reclaim.

Overrides /proc/sys/vm/swappiness for the particular group. The tunable

in the root cgroup corresponds to the global swappiness setting.



Please note that unlike during the global reclaim, limit reclaim

enforces that 0 swappiness really prevents from any swapping even if

there is a swap storage available. This might lead to memcg OOM killer

if there are no file pages to reclaim.



5.4 failcnt

mm/memcontrol.c

+1 −1
Original line number Diff line number Diff line
@@ -1550,7 +1550,7 @@ static unsigned long mem_cgroup_margin(struct mem_cgroup *memcg) 
int mem_cgroup_swappiness(struct mem_cgroup *memcg)

{

	/* root ? */

	if (!css_parent(&memcg->css))

	if (mem_cgroup_disabled() || !css_parent(&memcg->css))

		return vm_swappiness;



	return memcg->swappiness;

mm/vmscan.c

+8 −10
Original line number Diff line number Diff line
@@ -83,6 +83,9 @@ struct scan_control { 
	/* Scan (total_size >> priority) pages at once */

	int priority;



	/* anon vs. file LRUs scanning "ratio" */

	int swappiness;



	/*

	 * The memory cgroup that hit its limit and as a result is the

	 * primary target of this reclaim invocation.
@@ -1845,13 +1848,6 @@ static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan, 
	return shrink_inactive_list(nr_to_scan, lruvec, sc, lru);

}



static int vmscan_swappiness(struct scan_control *sc)

{

	if (global_reclaim(sc))

		return vm_swappiness;

	return mem_cgroup_swappiness(sc->target_mem_cgroup);

}



enum scan_balance {

	SCAN_EQUAL,

	SCAN_FRACT,
@@ -1912,7 +1908,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc, 
	 * using the memory controller's swap limit feature would be

	 * too expensive.

	 */

	if (!global_reclaim(sc) && !vmscan_swappiness(sc)) {

	if (!global_reclaim(sc) && !sc->swappiness) {

		scan_balance = SCAN_FILE;

		goto out;

	}
@@ -1922,7 +1918,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc, 
	 * system is close to OOM, scan both anon and file equally

	 * (unless the swappiness setting disagrees with swapping).

	 */

	if (!sc->priority && vmscan_swappiness(sc)) {

	if (!sc->priority && sc->swappiness) {

		scan_balance = SCAN_EQUAL;

		goto out;

	}
@@ -1965,7 +1961,7 @@ static void get_scan_count(struct lruvec *lruvec, struct scan_control *sc, 
	 * With swappiness at 100, anonymous and file have the same priority.

	 * This scanning priority is essentially the inverse of IO cost.

	 */

	anon_prio = vmscan_swappiness(sc);

	anon_prio = sc->swappiness;

	file_prio = 200 - anon_prio;



	/*
@@ -2265,6 +2261,7 @@ static void shrink_zone(struct zone *zone, struct scan_control *sc) 


			lruvec = mem_cgroup_zone_lruvec(zone, memcg);



			sc->swappiness = mem_cgroup_swappiness(memcg);

			shrink_lruvec(lruvec, sc);



			/*
@@ -2731,6 +2728,7 @@ unsigned long mem_cgroup_shrink_node_zone(struct mem_cgroup *memcg, 
		.may_swap = !noswap,

		.order = 0,

		.priority = 0,

		.swappiness = mem_cgroup_swappiness(memcg),

		.target_mem_cgroup = memcg,

	};

	struct lruvec *lruvec = mem_cgroup_zone_lruvec(zone, memcg);

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