From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f176.google.com (mail-wi0-f176.google.com [209.85.212.176]) by kanga.kvack.org (Postfix) with ESMTP id 6D8D528027E for ; Wed, 15 Jul 2015 07:15:19 -0400 (EDT) Received: by wiga1 with SMTP id a1so125755130wig.0 for ; Wed, 15 Jul 2015 04:15:19 -0700 (PDT) Received: from mail-wg0-f45.google.com (mail-wg0-f45.google.com. [74.125.82.45]) by mx.google.com with ESMTPS id bd2si7304056wjc.130.2015.07.15.04.15.17 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 15 Jul 2015 04:15:18 -0700 (PDT) Received: by wgxm20 with SMTP id m20so30741800wgx.3 for ; Wed, 15 Jul 2015 04:15:17 -0700 (PDT) From: Michal Hocko Subject: [PATCH 4/5] memcg: restructure mem_cgroup_can_attach() Date: Wed, 15 Jul 2015 13:14:44 +0200 Message-Id: <1436958885-18754-5-git-send-email-mhocko@kernel.org> In-Reply-To: <1436958885-18754-1-git-send-email-mhocko@kernel.org> References: <1436958885-18754-1-git-send-email-mhocko@kernel.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton , Johannes Weiner Cc: Vladimir Davydov , Tejun Heo , linux-mm@kvack.org, LKML From: Tejun Heo Restructure it to lower nesting level and help the planned threadgroup leader iteration changes. This is pure reorganization. Reviewed-by: Vladimir Davydov Signed-off-by: Tejun Heo Cc: Johannes Weiner Acked-by: Michal Hocko --- mm/memcontrol.c | 61 ++++++++++++++++++++++++++++++--------------------------- 1 file changed, 32 insertions(+), 29 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a3543dedc153..5d4fba8cbdd0 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -4828,10 +4828,12 @@ static void mem_cgroup_clear_mc(void) static int mem_cgroup_can_attach(struct cgroup_subsys_state *css, struct cgroup_taskset *tset) { - struct task_struct *p = cgroup_taskset_first(tset); - int ret = 0; struct mem_cgroup *memcg = mem_cgroup_from_css(css); + struct mem_cgroup *from; + struct task_struct *p; + struct mm_struct *mm; unsigned long move_flags; + int ret = 0; /* * We are now commited to this value whatever it is. Changes in this @@ -4839,36 +4841,37 @@ static int mem_cgroup_can_attach(struct cgroup_subsys_state *css, * So we need to save it, and keep it going. */ move_flags = READ_ONCE(memcg->move_charge_at_immigrate); - if (move_flags) { - struct mm_struct *mm; - struct mem_cgroup *from = mem_cgroup_from_task(p); + if (!move_flags) + return 0; - VM_BUG_ON(from == memcg); + p = cgroup_taskset_first(tset); + from = mem_cgroup_from_task(p); - mm = get_task_mm(p); - if (!mm) - return 0; - /* We move charges only when we move a owner of the mm */ - if (mm->owner == p) { - VM_BUG_ON(mc.from); - VM_BUG_ON(mc.to); - VM_BUG_ON(mc.precharge); - VM_BUG_ON(mc.moved_charge); - VM_BUG_ON(mc.moved_swap); - - spin_lock(&mc.lock); - mc.from = from; - mc.to = memcg; - mc.flags = move_flags; - spin_unlock(&mc.lock); - /* We set mc.moving_task later */ - - ret = mem_cgroup_precharge_mc(mm); - if (ret) - mem_cgroup_clear_mc(); - } - mmput(mm); + VM_BUG_ON(from == memcg); + + mm = get_task_mm(p); + if (!mm) + return 0; + /* We move charges only when we move a owner of the mm */ + if (mm->owner == p) { + VM_BUG_ON(mc.from); + VM_BUG_ON(mc.to); + VM_BUG_ON(mc.precharge); + VM_BUG_ON(mc.moved_charge); + VM_BUG_ON(mc.moved_swap); + + spin_lock(&mc.lock); + mc.from = from; + mc.to = memcg; + mc.flags = move_flags; + spin_unlock(&mc.lock); + /* We set mc.moving_task later */ + + ret = mem_cgroup_precharge_mc(mm); + if (ret) + mem_cgroup_clear_mc(); } + mmput(mm); return ret; } -- 2.1.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org