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authorJohannes Weiner <hannes@cmpxchg.org>2011-03-24 02:42:21 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-24 05:46:23 +0300
commit9d11ea9f163a14920487bdda77461e64d600fd48 (patch)
tree9435e30836ee97f3e8c235451bc944cdc8a345c4 /mm/memcontrol.c
parentb7c6167848fa36e32f1874b95c1edc02881cd040 (diff)
downloadlinux-9d11ea9f163a14920487bdda77461e64d600fd48.tar.xz
memcg: simplify the way memory limits are checked
Since transparent huge pages, checking whether memory cgroups are below their limits is no longer enough, but the actual amount of chargeable space is important. To not have more than one limit-checking interface, replace memory_cgroup_check_under_limit() and memory_cgroup_check_margin() with a single memory_cgroup_margin() that returns the chargeable space and leaves the comparison to the callsite. Soft limits are now checked the other way round, by using the already existing function that returns the amount by which soft limits are exceeded: res_counter_soft_limit_excess(). Also remove all the corresponding functions on the res_counter side that are now no longer used. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp> Acked-by: Balbir Singh <balbir@linux.vnet.ibm.com> Cc: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r--mm/memcontrol.c49
1 files changed, 17 insertions, 32 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 13de53fe0108..62bbb48980e5 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -504,11 +504,6 @@ static void mem_cgroup_remove_from_trees(struct mem_cgroup *mem)
}
}
-static inline unsigned long mem_cgroup_get_excess(struct mem_cgroup *mem)
-{
- return res_counter_soft_limit_excess(&mem->res) >> PAGE_SHIFT;
-}
-
static struct mem_cgroup_per_zone *
__mem_cgroup_largest_soft_limit_node(struct mem_cgroup_tree_per_zone *mctz)
{
@@ -1127,33 +1122,21 @@ unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
#define mem_cgroup_from_res_counter(counter, member) \
container_of(counter, struct mem_cgroup, member)
-static bool mem_cgroup_check_under_limit(struct mem_cgroup *mem)
-{
- if (do_swap_account) {
- if (res_counter_check_under_limit(&mem->res) &&
- res_counter_check_under_limit(&mem->memsw))
- return true;
- } else
- if (res_counter_check_under_limit(&mem->res))
- return true;
- return false;
-}
-
/**
- * mem_cgroup_check_margin - check if the memory cgroup allows charging
- * @mem: memory cgroup to check
- * @bytes: the number of bytes the caller intends to charge
+ * mem_cgroup_margin - calculate chargeable space of a memory cgroup
+ * @mem: the memory cgroup
*
- * Returns a boolean value on whether @mem can be charged @bytes or
- * whether this would exceed the limit.
+ * Returns the maximum amount of memory @mem can be charged with, in
+ * bytes.
*/
-static bool mem_cgroup_check_margin(struct mem_cgroup *mem, unsigned long bytes)
+static unsigned long long mem_cgroup_margin(struct mem_cgroup *mem)
{
- if (!res_counter_check_margin(&mem->res, bytes))
- return false;
- if (do_swap_account && !res_counter_check_margin(&mem->memsw, bytes))
- return false;
- return true;
+ unsigned long long margin;
+
+ margin = res_counter_margin(&mem->res);
+ if (do_swap_account)
+ margin = min(margin, res_counter_margin(&mem->memsw));
+ return margin;
}
static unsigned int get_swappiness(struct mem_cgroup *memcg)
@@ -1420,7 +1403,9 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
bool noswap = reclaim_options & MEM_CGROUP_RECLAIM_NOSWAP;
bool shrink = reclaim_options & MEM_CGROUP_RECLAIM_SHRINK;
bool check_soft = reclaim_options & MEM_CGROUP_RECLAIM_SOFT;
- unsigned long excess = mem_cgroup_get_excess(root_mem);
+ unsigned long excess;
+
+ excess = res_counter_soft_limit_excess(&root_mem->res) >> PAGE_SHIFT;
/* If memsw_is_minimum==1, swap-out is of-no-use. */
if (root_mem->memsw_is_minimum)
@@ -1477,9 +1462,9 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
return ret;
total += ret;
if (check_soft) {
- if (res_counter_check_within_soft_limit(&root_mem->res))
+ if (!res_counter_soft_limit_excess(&root_mem->res))
return total;
- } else if (mem_cgroup_check_under_limit(root_mem))
+ } else if (mem_cgroup_margin(root_mem))
return 1 + total;
}
return total;
@@ -1898,7 +1883,7 @@ static int __mem_cgroup_do_charge(struct mem_cgroup *mem, gfp_t gfp_mask,
ret = mem_cgroup_hierarchical_reclaim(mem_over_limit, NULL,
gfp_mask, flags);
- if (mem_cgroup_check_margin(mem_over_limit, csize))
+ if (mem_cgroup_margin(mem_over_limit) >= csize)
return CHARGE_RETRY;
/*
* Even though the limit is exceeded at this point, reclaim