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Commit 430e4863 authored by KAMEZAWA Hiroyuki's avatar KAMEZAWA Hiroyuki Committed by Linus Torvalds
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memcg: update threshold and softlimit at commit 



Presently, move_task does "batched" precharge.  Because res_counter or
css's refcnt are not-scalable jobs for memcg, try_charge_()..  tend to be
done in batched manner if allowed.

Now, softlimit and threshold check their event counter in try_charge, but
the charge is not a 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.

Signed-off-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Kirill A. Shutemov <kirill@shutemov.name>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c62b1a3b

mm/memcontrol.c

+18 −20
Original line number Diff line number Diff line
@@ -1424,8 +1424,7 @@ static int __cpuinit memcg_stock_cpu_callback(struct notifier_block *nb, 
 * oom-killer can be invoked.

 */

static int __mem_cgroup_try_charge(struct mm_struct *mm,

			gfp_t gfp_mask, struct mem_cgroup **memcg,

			bool oom, struct page *page)

			gfp_t gfp_mask, struct mem_cgroup **memcg, bool oom)

{

	struct mem_cgroup *mem, *mem_over_limit;

	int nr_retries = MEM_CGROUP_RECLAIM_RETRIES;
@@ -1463,7 +1462,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm, 
		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 +1557,7 @@ static int __mem_cgroup_try_charge(struct mm_struct *mm, 
	}

	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 +1681,16 @@ static void __mem_cgroup_commit_charge(struct mem_cgroup *mem, 
	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);



}



/**
@@ -1788,7 +1788,7 @@ static int mem_cgroup_move_parent(struct page_cgroup *pc, 
		goto put;



	parent = mem_cgroup_from_cont(pcg);

	ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false, page);

	ret = __mem_cgroup_try_charge(NULL, gfp_mask, &parent, false);

	if (ret || !parent)

		goto put_back;
@@ -1824,7 +1824,7 @@ static int mem_cgroup_charge_common(struct page *page, struct mm_struct *mm, 
	prefetchw(pc);



	mem = memcg;

	ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true, page);

	ret = __mem_cgroup_try_charge(mm, gfp_mask, &mem, true);

	if (ret || !mem)

		return ret;
@@ -1944,14 +1944,14 @@ int mem_cgroup_try_charge_swapin(struct mm_struct *mm, 
	if (!mem)

		goto charge_cur_mm;

	*ptr = mem;

	ret = __mem_cgroup_try_charge(NULL, mask, ptr, true, page);

	ret = __mem_cgroup_try_charge(NULL, mask, ptr, true);

	/* drop extra refcnt from tryget */

	css_put(&mem->css);

	return ret;

charge_cur_mm:

	if (unlikely(!mm))

		mm = &init_mm;

	return __mem_cgroup_try_charge(mm, mask, ptr, true, page);

	return __mem_cgroup_try_charge(mm, mask, ptr, true);

}



static void
@@ -2340,8 +2340,7 @@ int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr) 
	unlock_page_cgroup(pc);



	if (mem) {

		ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false,

						page);

		ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false);

		css_put(&mem->css);

	}

	*ptr = mem;
@@ -3872,8 +3871,7 @@ static int mem_cgroup_do_precharge(unsigned long count) 
			batch_count = PRECHARGE_COUNT_AT_ONCE;

			cond_resched();

		}

		ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem,

								false, NULL);

		ret = __mem_cgroup_try_charge(NULL, GFP_KERNEL, &mem, false);

		if (ret || !mem)

			/* mem_cgroup_clear_mc() will do uncharge later */

			return -ENOMEM;