linux-kernel - Re: [RFC PATCH 0/5] cgroup/cpuset: A new "isolcpus" paritition

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-next>] [day] [month] [year] [list]

Date:   Wed, 12 Apr 2023 10:22:23 -1000
From:   Tejun Heo <tj@...nel.org>
To:     Waiman Long <longman@...hat.com>
Cc:     Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Jonathan Corbet <corbet@....net>,
        Shuah Khan <shuah@...nel.org>, linux-kernel@...r.kernel.org,
        cgroups@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        Juri Lelli <juri.lelli@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: Re: [RFC PATCH 0/5] cgroup/cpuset: A new "isolcpus" paritition

Hello, Waiman.

On Wed, Apr 12, 2023 at 03:52:36PM -0400, Waiman Long wrote:
> There is still a distribution hierarchy as the list of isolation CPUs have
> to be distributed down to the target cgroup through the hierarchy. For
> example,
> 
> cgroup root
>   +- isolcpus  (cpus 8,9; isolcpus)
>   +- user.slice (cpus 1-9; ecpus 1-7; member)
>      +- user-x.slice (cpus 8,9; ecpus 8,9; isolated)
>      +- user-y.slice (cpus 1,2; ecpus 1,2; member)
> 
> OTOH, I do agree that this can be somewhat hacky. That is why I post it as a
> RFC to solicit feedback.

Wouldn't it be possible to make it hierarchical by adding another cpumask to
cpuset which lists the cpus which are allowed in the hierarchy but not used
unless claimed by an isolated domain?

Thanks.

-- 
tejun