linux-kernel - Re: [RFC][-mm PATCH 1/8] Memory controller resource counters (v3)

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Date:	Fri, 20 Jul 2007 13:20:32 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Linux Containers" <containers@...ts.osdl.org>,
	"YAMAMOTO Takashi" <yamamoto@...inux.co.jp>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Eric W Biederman" <ebiederm@...ssion.com>,
	"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>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][-mm PATCH 1/8] Memory controller resource counters (v3)

On 7/20/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> +
> +ssize_t res_counter_read(struct res_counter *counter, int member,
> +               const char __user *userbuf, size_t nbytes, loff_t *pos)
> +{
> +       unsigned long *val;
> +       char buf[64], *s;
> +
> +       s = buf;
> +       val = res_counter_member(counter, member);
> +       s += sprintf(s, "%lu\n", *val);
> +       return simple_read_from_buffer((void __user *)userbuf, nbytes,
> +                       pos, buf, s - buf);
> +}

I think it should be possible to use the support built-in to task
containers to export a uint64 rather than having to create a separate
function here.

> +
> +ssize_t res_counter_write(struct res_counter *counter, int member,
> +               const char __user *userbuf, size_t nbytes, loff_t *pos)
> +{
> +       int ret;
> +       char *buf, *end;
> +       unsigned long tmp, *val;
> +
> +       buf = kmalloc(nbytes + 1, GFP_KERNEL);
> +       ret = -ENOMEM;
> +       if (buf == NULL)
> +               goto out;
> +
> +       buf[nbytes] = '\0';
> +       ret = -EFAULT;
> +       if (copy_from_user(buf, userbuf, nbytes))
> +               goto out_free;
> +
> +       ret = -EINVAL;
> +       tmp = simple_strtoul(buf, &end, 10);
> +       if (*end != '\0')
> +               goto out_free;
> +
> +       val = res_counter_member(counter, member);
> +       *val = tmp;
> +       ret = nbytes;
> +out_free:
> +       kfree(buf);
> +out:
> +       return ret;
> +}

I should probably add a generic "write uint64" wraper to task
containers as well.

Paul
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