linux-kernel - Re: [PATCH 11/11] cpuset: export effective masks to userspace

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Message-ID: <52171501.8050401@huawei.com>
Date:	Fri, 23 Aug 2013 15:53:37 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Containers <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH 11/11] cpuset: export effective masks to userspace

On 2013/8/21 22:20, Tejun Heo wrote:
> On Wed, Aug 21, 2013 at 06:01:32PM +0800, Li Zefan wrote:
>>  	{
>> +		.name = "effective_cpus",
>> +		.flags = CFTYPE_SANE,
>> +		.read = cpuset_common_file_read,
>> +		.max_write_len = (100U + 6 * NR_CPUS),
>> +		.private = FILE_EFFECTIVE_CPULIST,
> 
> I don't think we need CFTYPE_SANE.  We can just expose these
> unconditionally, right?  It still means the same thing when !sane.
> 

It seems confusing if there're two interaces but they actually mean
the same thing.

Another reason I didn't do this is, they're not always the same. When
!sane, If cpus_allowed is empty, effective_cpus is not empty, and you
are not able to put tasks into this cpuset. So if we want to  expose
it unconditionally, I'll make sure cpus_allowed == effective_cpus
always stand when !sane.

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