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 10:24:57 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Zefan Li <lizefan@...wei.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

On 02/26/2015 06:05 AM, Zefan Li wrote:
>> +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().

OK, can do.

I see that cpuset_common_seq_show already takes a lock, so having
one global variable for this should not introduce any additional
contention.

I will send a v4.

>> @@ -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;
>>  	}


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