linux-kernel - Re: [PATCH 2/2] cpusets,isolcpus: add file to show isolated cpus in cpuset

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Date:	Thu, 26 Feb 2015 19:05:57 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	<riel@...hat.com>
CC:	<linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Clark Williams <williams@...hat.com>,
	Ingo Molnar <mingo@...hat.com>,
	"Luiz Capitulino" <lcapitulino@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	<cgroups@...r.kernel.org>
Subject: Re: [PATCH 2/2] cpusets,isolcpus: add file to show isolated cpus
 in cpuset

> +static void cpuset_seq_print_isolcpus(struct seq_file *sf, struct cpuset *cs)
> +{
> +	cpumask_var_t my_isolated_cpus;
> +
> +	if (!alloc_cpumask_var(&my_isolated_cpus, GFP_KERNEL))
> +		return;
> +

Make it return -ENOMEM ? Or make it a global variable and allocate memory for it
in cpuset_init().

> +	cpumask_and(my_isolated_cpus, cs->cpus_allowed, cpu_isolated_map);
> +
> +	seq_printf(sf, "%*pbl\n", nodemask_pr_args(my_isolated_cpus));
> +
> +	free_cpumask_var(my_isolated_cpus);
> +}
> +
>  /*
>   * These ascii lists should be read in a single call, by using a user
>   * buffer large enough to hold the entire map.  If read in smaller
> @@ -1733,6 +1748,9 @@ static int cpuset_common_seq_show(struct seq_file *sf, void *v)
>  	case FILE_EFFECTIVE_MEMLIST:
>  		seq_printf(sf, "%*pbl\n", nodemask_pr_args(&cs->effective_mems));
>  		break;
> +	case FILE_ISOLCPUS:
> +		cpuset_seq_print_isolcpus(sf, cs);
> +		break;
>  	default:
>  		ret = -EINVAL;
>  	}
> @@ -1893,6 +1911,12 @@ static struct cftype files[] = {
>  		.private = FILE_MEMORY_PRESSURE_ENABLED,
>  	},
>  
> +	{
> +		.name = "isolcpus",
> +		.seq_show = cpuset_common_seq_show,
> +		.private = FILE_ISOLCPUS,
> +	},
> +
>  	{ }	/* terminate */
>  };
>  
> 

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