linux-kernel - Re: [PATCH v7 08/24] x86/resctrl: Track the number of dirty RMID a CLOSID has

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Date:   Thu, 9 Nov 2023 09:43:31 -0800
From:   Reinette Chatre <reinette.chatre@...el.com>
To:     James Morse <james.morse@....com>, <x86@...nel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Fenghua Yu <fenghua.yu@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        Babu Moger <Babu.Moger@....com>,
        <shameerali.kolothum.thodi@...wei.com>,
        D Scott Phillips OS <scott@...amperecomputing.com>,
        <carl@...amperecomputing.com>, <lcherian@...vell.com>,
        <bobo.shaobowang@...wei.com>, <tan.shaopeng@...itsu.com>,
        <baolin.wang@...ux.alibaba.com>,
        Jamie Iles <quic_jiles@...cinc.com>,
        Xin Hao <xhao@...ux.alibaba.com>, <peternewman@...gle.com>,
        <dfustini@...libre.com>, <amitsinght@...vell.com>
Subject: Re: [PATCH v7 08/24] x86/resctrl: Track the number of dirty RMID a
 CLOSID has

Hi James,

On 10/25/2023 11:03 AM, James Morse wrote:
> @@ -794,13 +815,30 @@ void mbm_setup_overflow_handler(struct rdt_domain *dom, unsigned long delay_ms)
>  static int dom_data_init(struct rdt_resource *r)
>  {
>  	u32 idx_limit = resctrl_arch_system_num_rmid_idx();
> +	u32 num_closid = resctrl_arch_get_num_closid(r);
>  	struct rmid_entry *entry = NULL;
> +	int err = 0, i;
>  	u32 idx;
> -	int i;
> +
> +	mutex_lock(&rdtgroup_mutex);
> +	if (IS_ENABLED(CONFIG_RESCTRL_RMID_DEPENDS_ON_CLOSID)) {
> +		u32 *tmp;
> +
> +		tmp = kcalloc(num_closid, sizeof(*tmp), GFP_KERNEL);
> +		if (!tmp) {
> +			err = -ENOMEM;
> +			goto out_unlock;
> +		}
> +
> +		closid_num_dirty_rmid = tmp;
> +	}
>  
>  	rmid_ptrs = kcalloc(idx_limit, sizeof(struct rmid_entry), GFP_KERNEL);
> -	if (!rmid_ptrs)
> -		return -ENOMEM;
> +	if (!rmid_ptrs) {
> +		kfree(closid_num_dirty_rmid);

Since this is a global variable and resctrl keeps running on this alloc
failure I think it will be safer to add a:
	
		closid_num_dirty_rmid = NULL

With that added you can add:

Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>

Reinette