linux-kernel - Re: [PATCH 5/9] x86/intel_rdt: Add new cgroup and Class of service management

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Message-ID: <20150728171748.GV25159@twins.programming.kicks-ass.net>
Date:	Tue, 28 Jul 2015 19:17:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, vikas.shivappa@...el.com,
	x86@...nel.org, hpa@...or.com, tglx@...utronix.de,
	mingo@...nel.org, tj@...nel.org, matt.fleming@...el.com,
	will.auld@...el.com, glenn.p.williamson@...el.com,
	kanaka.d.juvva@...el.com
Subject: Re: [PATCH 5/9] x86/intel_rdt: Add new cgroup and Class of service
 management

On Wed, Jul 01, 2015 at 03:21:06PM -0700, Vikas Shivappa wrote:
>  static int __init intel_rdt_late_init(void)
>  {
>  	struct cpuinfo_x86 *c = &boot_cpu_data;
> +	static struct clos_cbm_map *ccm;
> +	u32 maxid, max_cbm_len;
> +	size_t sizeb;

Why 'sizeb' ? 'size' is still available, right?

> +	int err = 0;
>  
> -	if (!cpu_has(c, X86_FEATURE_CAT_L3))
> +	if (!cpu_has(c, X86_FEATURE_CAT_L3)) {
> +		rdt_root_group.css.ss->disabled = 1;
>  		return -ENODEV;
> +	}
> +	maxid = c->x86_cache_max_closid;
> +	max_cbm_len = c->x86_cache_max_cbm_len;
> +
> +	sizeb = BITS_TO_LONGS(maxid) * sizeof(long);
> +	rdtss_info.closmap = kzalloc(sizeb, GFP_KERNEL);
> +	if (!rdtss_info.closmap) {
> +		err = -ENOMEM;
> +		goto out_err;
> +	}
> +
> +	sizeb = maxid * sizeof(struct clos_cbm_map);
> +	ccmap = kzalloc(sizeb, GFP_KERNEL);
> +	if (!ccmap) {
> +		kfree(rdtss_info.closmap);
> +		err = -ENOMEM;
> +		goto out_err;
> +	}

What's the expected size of max_closid? iow, how big of an array are you
in fact allocating here?
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