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Message-ID: <47DE57C2.5060206@openvz.org>
Date: Mon, 17 Mar 2008 14:36:34 +0300
From: Pavel Emelyanov <xemul@...nvz.org>
To: Balbir Singh <balbir@...ux.vnet.ibm.com>
CC: linux-mm@...ck.org, Hugh Dickins <hugh@...itas.com>,
Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
linux-kernel@...r.kernel.org, taka@...inux.co.jp,
David Rientjes <rientjes@...gle.com>,
Pavel Emelianov <xemul@...nvz.org>,
Andrew Morton <akpm@...ux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC][2/3] Account and control virtual address space allocations
[snip]
> +int mem_cgroup_update_as(struct mm_struct *mm, long nr_pages)
> +{
> + int ret = 0;
> + struct mem_cgroup *mem;
> + if (mem_cgroup_subsys.disabled)
> + return ret;
> +
> + rcu_read_lock();
> + mem = rcu_dereference(mm->mem_cgroup);
> + css_get(&mem->css);
> + rcu_read_unlock();
> +
> + if (nr_pages > 0) {
> + if (res_counter_charge(&mem->as_res, (nr_pages * PAGE_SIZE)))
> + ret = 1;
> + } else
> + res_counter_uncharge(&mem->as_res, (-nr_pages * PAGE_SIZE));
No, please, no. Let's make two calls - mem_cgroup_charge_as and mem_cgroup_uncharge_as.
[snip]
> @@ -1117,6 +1117,9 @@ munmap_back:
> }
> }
>
> + if (mem_cgroup_update_as(mm, len >> PAGE_SHIFT))
> + return -ENOMEM;
> +
Why not use existintg cap_vm_enough_memory and co?
[snip]
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