Commit b85a96c0 authored by Daisuke Nishimura's avatar Daisuke Nishimura Committed by Linus Torvalds
Browse files

memcg: memory swap controller: fix limit check



There are scatterd calls of res_counter_check_under_limit(), and most of
them don't take mem+swap accounting into account.

define mem_cgroup_check_under_limit() and avoid direct use of
res_counter_check_limit().
Reported-by: default avatarDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: default avatarDaisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f9717d28
......@@ -571,6 +571,18 @@ done:
return ret;
}
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;
}
/*
* 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
......@@ -592,7 +604,7 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
* have left.
*/
ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap);
if (res_counter_check_under_limit(&root_mem->res))
if (mem_cgroup_check_under_limit(root_mem))
return 0;
next_mem = mem_cgroup_get_first_node(root_mem);
......@@ -606,7 +618,7 @@ static int mem_cgroup_hierarchical_reclaim(struct mem_cgroup *root_mem,
continue;
}
ret = try_to_free_mem_cgroup_pages(next_mem, gfp_mask, noswap);
if (res_counter_check_under_limit(&root_mem->res))
if (mem_cgroup_check_under_limit(root_mem))
return 0;
cgroup_lock();
next_mem = mem_cgroup_get_next_node(next_mem, root_mem);
......@@ -709,12 +721,8 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm,
* current usage of the cgroup before giving up
*
*/
if (do_swap_account) {
if (res_counter_check_under_limit(&mem_over_limit->res) &&
res_counter_check_under_limit(&mem_over_limit->memsw))
continue;
} else if (res_counter_check_under_limit(&mem_over_limit->res))
continue;
if (mem_cgroup_check_under_limit(mem_over_limit))
continue;
if (!nr_retries--) {
if (oom) {
......@@ -1334,7 +1342,7 @@ int mem_cgroup_shrink_usage(struct mm_struct *mm, gfp_t gfp_mask)
do {
progress = try_to_free_mem_cgroup_pages(mem, gfp_mask, true);
progress += res_counter_check_under_limit(&mem->res);
progress += mem_cgroup_check_under_limit(mem);
} while (!progress && --retry);
css_put(&mem->css);
......
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