linux-kernel - Re: [PATCH-cgroup 3/4] cgroup/cpuset: Keep track of CPUs in isolated partitions

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <9e2772e3-f615-5e80-6922-5a2dd06a8b07@redhat.com>
Date:   Wed, 18 Oct 2023 09:30:04 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Shuah Khan <shuah@...nel.org>, cgroups@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH-cgroup 3/4] cgroup/cpuset: Keep track of CPUs in isolated
 partitions

On 10/18/23 05:26, Tejun Heo wrote:
> On Fri, Oct 13, 2023 at 02:11:21PM -0400, Waiman Long wrote:
> ...
>> @@ -3875,6 +3931,13 @@ static struct cftype dfl_files[] = {
>>   		.flags = CFTYPE_ONLY_ON_ROOT | CFTYPE_DEBUG,
>>   	},
>>   
>> +	{
>> +		.name = "cpus.isolated",
>> +		.seq_show = cpuset_common_seq_show,
>> +		.private = FILE_ISOLATED_CPULIST,
>> +		.flags = CFTYPE_ONLY_ON_ROOT | CFTYPE_DEBUG,
>> +	},
> I'd much rather show this in a wq sysfs file along with other related masks,
> and not in a DEBUG file.

It can certainly be exposed as a permanent addition to the cgroup 
control files instead of a debug only file. However this set of isolated 
CPUs may be used by others not just by workqueue. So I doubt if it 
should be a sysfs file in the workqueue directory. I can see if it is 
possible to put a symlink there point back to the cgroupfs.

Thanks,
Longman