Now, move_task introduced "batched" precharge. Because res_counter or css's refcnt
are not-scalable jobs for memcg, charge()s should be done in batched manner
if allowed.
Now, softlimit and threshold check their event counter in try_charge, but
this charge() is not per-page event. And event counter is not updated at charge().
Moreover, precharge doesn't pass "page" to try_charge() and softlimit tree
will be never updated until uncharge() causes an event.
So, the best place to check the event counter is commit_charge(). This is
per-page event by its nature. This patch move checks to there.
Cc: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>
Cc: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
Cc: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
---
mm/memcontrol.c | 23 ++++++++++++-----------
1 file changed, 12 insertions(+), 11 deletions(-)
Index: mmotm-2.6.33-Feb10/mm/memcontrol.c
===================================================================
--- mmotm-2.6.33-Feb10.orig/mm/memcontrol.c
+++ mmotm-2.6.33-Feb10/mm/memcontrol.c
@@ -1463,7 +1463,7 @@ static int __mem_cgroup_try_charge(struc
unsigned long flags = 0;
if (consume_stock(mem))
- goto charged;
+ goto done;
ret = res_counter_charge(&mem->res, csize, &fail_res);
if (likely(!ret)) {
@@ -1558,16 +1558,7 @@ static int __mem_cgroup_try_charge(struc
}
if (csize > PAGE_SIZE)
refill_stock(mem, csize - PAGE_SIZE);
-charged:
- /*
- * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
- * if they exceeds softlimit.
- */
- if (page && mem_cgroup_soft_limit_check(mem))
- mem_cgroup_update_tree(mem, page);
done:
- if (mem_cgroup_threshold_check(mem))
- mem_cgroup_threshold(mem);
return 0;
nomem:
css_put(&mem->css);
@@ -1691,6 +1682,16 @@ static void __mem_cgroup_commit_charge(s
mem_cgroup_charge_statistics(mem, pc, true);
unlock_page_cgroup(pc);
+ /*
+ * "charge_statistics" updated event counter. Then, check it.
+ * Insert ancestor (and ancestor's ancestors), to softlimit RB-tree.
+ * if they exceeds softlimit.
+ */
+ if (mem_cgroup_soft_limit_check(mem))
+ mem_cgroup_update_tree(mem, pc->page);
+ if (mem_cgroup_threshold_check(mem))
+ mem_cgroup_threshold(mem);
+
}
/**
--
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