linux-kernel - Re: [RFC][-mm PATCH 8/8] Add switch to control what type of pages to limit (v3)

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Message-ID: <6599ad830707201441q65c8efc2kecd99d6d8094672@mail.gmail.com>
Date:	Fri, 20 Jul 2007 14:41:22 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Linux Containers" <containers@...ts.osdl.org>,
	"YAMAMOTO Takashi" <yamamoto@...inux.co.jp>,
	"Linux MM Mailing List" <linux-mm@...ck.org>,
	"Vaidyanathan Srinivasan" <svaidy@...ux.vnet.ibm.com>,
	"Pavel Emelianov" <xemul@...nvz.org>,
	"Dave Hansen" <haveblue@...ibm.com>,
	"Eric W Biederman" <ebiederm@...ssion.com>
Subject: Re: [RFC][-mm PATCH 8/8] Add switch to control what type of pages to limit (v3)

On 7/20/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> -static struct mem_container init_mem_container;
> +static ssize_t mem_control_type_read(struct container *cont,
> +                               struct cftype *cft,
> +                               struct file *file, char __user *userbuf,
> +                               size_t nbytes, loff_t *ppos)
> +{
> +       unsigned long val;
> +       char buf[64], *s;
> +       struct mem_container *mem;
> +
> +       mem = mem_container_from_cont(cont);
> +       s = buf;
> +       val = mem->control_type;
> +       s += sprintf(s, "%lu\n", val);
> +       return simple_read_from_buffer((void __user *)userbuf, nbytes,
> +                       ppos, buf, s - buf);
> +}

This could just use the read_uint64() hook and be something like

static u64 mem_container_control_type_read(struct container *cont,
struct cftype *cft)
{
  return mem_container_from_cont(cont)->control_type;
}

Paul
-
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