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memcg: export memory cgroup's swappiness with mem_cgroup_swappiness()

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Each memory cgroup has a 'swappiness' value which can be accessed by
get_swappiness(memcg).  The major user is try_to_free_mem_cgroup_pages()
and swappiness is passed by argument.  It's propagated by scan_control.

get_swappiness() is a static function but some planned updates will need
to get swappiness from files other than memcontrol.c This patch exports
get_swappiness() as mem_cgroup_swappiness().  With this, we can remove the
argument of swapiness from try_to_free...  and drop swappiness from
scan_control.  only memcg uses it.

Signed-off-by: KAMEZAWA Hiroyuki <[email protected]>
Cc: Daisuke Nishimura <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Ying Han <[email protected]>
Cc: Shaohua Li <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
KAMEZAWA Hiroyuki 2011-07-26 16:08:21 -07:00 • committed by Linus Torvalds
commit 1f4c025b5a
3 changed files with 26 additions and 25 deletions
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15
mm/memcontrol.c
View file

@ -249,7 +249,7 @@ struct mem_cgroup {
atomic_t oom_lock;
atomic_t refcnt;
unsigned int swappiness;
int swappiness;
/* OOM-Killer disable */
int oom_kill_disable;
@ -1329,7 +1329,7 @@ static unsigned long mem_cgroup_margin(struct mem_cgroup *mem)
return margin >> PAGE_SHIFT;
}
static unsigned int get_swappiness(struct mem_cgroup *memcg)
int mem_cgroup_swappiness(struct mem_cgroup *memcg)
{
struct cgroup *cgrp = memcg->css.cgroup;
@ -1776,12 +1776,11 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
/* we use swappiness of local cgroup */
if (check_soft) {
ret = mem_cgroup_shrink_node_zone(victim, gfp_mask,
noswap, get_swappiness(victim), zone,
&nr_scanned);
noswap, zone, &nr_scanned);
*total_scanned += nr_scanned;
} else
ret = try_to_free_mem_cgroup_pages(victim, gfp_mask,
noswap, get_swappiness(victim));
noswap);
css_put(&victim->css);
/*
* At shrinking usage, we can't check we should stop here or
@ -3826,7 +3825,7 @@ try_to_free:
goto out;
}
progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL,
false, get_swappiness(mem));
false);
if (!progress) {
nr_retries--;
/* maybe some writeback is necessary */
@ -4288,7 +4287,7 @@ static u64 mem_cgroup_swappiness_read(struct cgroup *cgrp, struct cftype *cft)
{
struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
return get_swappiness(memcg);
return mem_cgroup_swappiness(memcg);
}
static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft,
@ -4997,7 +4996,7 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
INIT_LIST_HEAD(&mem->oom_notify);
if (parent)
mem->swappiness = get_swappiness(parent);
mem->swappiness = mem_cgroup_swappiness(parent);
atomic_set(&mem->refcnt, 1);
mem->move_charge_at_immigrate = 0;
mutex_init(&mem->thresholds_lock);