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-rw-r--r--Documentation/controllers/memory.txt9
-rw-r--r--include/linux/swap.h3
-rw-r--r--mm/memcontrol.c78
-rw-r--r--mm/vmscan.c7
4 files changed, 86 insertions, 11 deletions
diff --git a/Documentation/controllers/memory.txt b/Documentation/controllers/memory.txt
index d71745cc2f0..e1501964df1 100644
--- a/Documentation/controllers/memory.txt
+++ b/Documentation/controllers/memory.txt
@@ -314,6 +314,15 @@ will be charged as a new owner of it.
showing for better debug please see the code for meanings.
+5.3 swappiness
+ Similar to /proc/sys/vm/swappiness, but affecting a hierarchy of groups only.
+
+ Following cgroup's swapiness can't be changed.
+ - root cgroup (uses /proc/sys/vm/swappiness).
+ - a cgroup which uses hierarchy and it has child cgroup.
+ - a cgroup which uses hierarchy and not the root of hierarchy.
+
+
6. Hierarchy support
The memory controller supports a deep hierarchy and hierarchical accounting.
diff --git a/include/linux/swap.h b/include/linux/swap.h
index be938ce4895..4ccca25d0f0 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -214,7 +214,8 @@ static inline void lru_cache_add_active_file(struct page *page)
extern unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
gfp_t gfp_mask);
extern unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem,
- gfp_t gfp_mask, bool noswap);
+ gfp_t gfp_mask, bool noswap,
+ unsigned int swappiness);
extern int __isolate_lru_page(struct page *page, int mode, int file);
extern unsigned long shrink_all_memory(unsigned long nr_pages);
extern int vm_swappiness;
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 027c0dd7a83..ab2ecbb95b8 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -164,6 +164,9 @@ struct mem_cgroup {
int obsolete;
atomic_t refcnt;
+ unsigned int swappiness;
+
+
unsigned int inactive_ratio;
/*
@@ -636,6 +639,22 @@ static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem)
return false;
}
+static unsigned int get_swappiness(struct mem_cgroup *memcg)
+{
+ struct cgroup *cgrp = memcg->css.cgroup;
+ unsigned int swappiness;
+
+ /* root ? */
+ if (cgrp->parent == NULL)
+ return vm_swappiness;
+
+ spin_lock(&memcg->reclaim_param_lock);
+ swappiness = memcg->swappiness;
+ spin_unlock(&memcg->reclaim_param_lock);
+
+ return swappiness;
+}
+
/*
* Dance down the hierarchy if needed to reclaim memory. We remember the
* last child we reclaimed from, so that we don't end up penalizing
@@ -656,7 +675,8 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
* but there might be left over accounting, even after children
* have left.
*/
- ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap);
+ ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap,
+ get_swappiness(root_mem));
if (mem_cgroup_check_under_limit(root_mem))
return 0;
if (!root_mem->use_hierarchy)
@@ -672,7 +692,8 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
cgroup_unlock();
continue;
}
- ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap);
+ ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap,
+ get_swappiness(next_mem));
if (mem_cgroup_check_under_limit(root_mem))
return 0;
cgroup_lock();
@@ -1400,7 +1421,8 @@ int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
rcu_read_unlock();
do {
- progress = try_to_free_mem_cgroup_pages(mem, gfp_mask, true);
+ progress = try_to_free_mem_cgroup_pages(mem, gfp_mask, true,
+ get_swappiness(mem));
progress += mem_cgroup_check_under_limit(mem);
} while (!progress && --retry);
@@ -1468,7 +1490,9 @@ static int mem_cgroup_resize_limit(struct mem_cgroup *memcg,
break;
progress = try_to_free_mem_cgroup_pages(memcg,
- GFP_KERNEL, false);
+ GFP_KERNEL,
+ false,
+ get_swappiness(memcg));
if (!progress) retry_count--;
}
@@ -1512,7 +1536,8 @@ int mem_cgroup_resize_memsw_limit(struct mem_cgroup *memcg,
break;
oldusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
- try_to_free_mem_cgroup_pages(memcg, GFP_KERNEL, true);
+ try_to_free_mem_cgroup_pages(memcg, GFP_KERNEL, true,
+ get_swappiness(memcg));
curusage = res_counter_read_u64(&memcg->memsw, RES_USAGE);
if (curusage >= oldusage)
retry_count--;
@@ -1643,8 +1668,8 @@ try_to_free:
ret = -EINTR;
goto out;
}
- progress = try_to_free_mem_cgroup_pages(mem,
- GFP_KERNEL, false);
+ progress = try_to_free_mem_cgroup_pages(mem, GFP_KERNEL,
+ false, get_swappiness(mem));
if (!progress) {
nr_retries--;
/* maybe some writeback is necessary */
@@ -1864,6 +1889,37 @@ static int mem_control_stat_show(struct cgroup *cont, struct cftype *cft,
return 0;
}
+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);
+}
+
+static int mem_cgroup_swappiness_write(struct cgroup *cgrp, struct cftype *cft,
+ u64 val)
+{
+ struct mem_cgroup *memcg = mem_cgroup_from_cont(cgrp);
+ struct mem_cgroup *parent;
+ if (val > 100)
+ return -EINVAL;
+
+ if (cgrp->parent == NULL)
+ return -EINVAL;
+
+ parent = mem_cgroup_from_cont(cgrp->parent);
+ /* If under hierarchy, only empty-root can set this value */
+ if ((parent->use_hierarchy) ||
+ (memcg->use_hierarchy && !list_empty(&cgrp->children)))
+ return -EINVAL;
+
+ spin_lock(&memcg->reclaim_param_lock);
+ memcg->swappiness = val;
+ spin_unlock(&memcg->reclaim_param_lock);
+
+ return 0;
+}
+
static struct cftype mem_cgroup_files[] = {
{
@@ -1902,6 +1958,11 @@ static struct cftype mem_cgroup_files[] = {
.write_u64 = mem_cgroup_hierarchy_write,
.read_u64 = mem_cgroup_hierarchy_read,
},
+ {
+ .name = "swappiness",
+ .read_u64 = mem_cgroup_swappiness_read,
+ .write_u64 = mem_cgroup_swappiness_write,
+ },
};
#ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
@@ -2093,6 +2154,9 @@ mem_cgroup_create(struct cgroup_subsys *ss, struct cgroup *cont)
mem->last_scanned_child = NULL;
spin_lock_init(&mem->reclaim_param_lock);
+ if (parent)
+ mem->swappiness = get_swappiness(parent);
+
return &mem->css;
free_out:
for_each_node_state(node, N_POSSIBLE)
diff --git a/mm/vmscan.c b/mm/vmscan.c
index f03c239440a..ece2f405187 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1707,14 +1707,15 @@ unsigned long try_to_free_pages(struct zonelist *zonelist, int order,
#ifdef CONFIG_CGROUP_MEM_RES_CTLR
unsigned long try_to_free_mem_cgroup_pages(struct mem_cgroup *mem_cont,
- gfp_t gfp_mask,
- bool noswap)
+ gfp_t gfp_mask,
+ bool noswap,
+ unsigned int swappiness)
{
struct scan_control sc = {
.may_writepage = !laptop_mode,
.may_swap = 1,
.swap_cluster_max = SWAP_CLUSTER_MAX,
- .swappiness = vm_swappiness,
+ .swappiness = swappiness,
.order = 0,
.mem_cgroup = mem_cont,
.isolate_pages = mem_cgroup_isolate_pages,