From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jacob Pan <jacob.jun.pan-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: Re: [RFC v2 2/2] cgroup: sev: Miscellaneous cgroup documentation.
Date: Mon, 15 Mar 2021 18:30:30 -0700
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To: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Vipin Sharma <vipinsh-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, mkoutny-IBi9RG/b67k@public.gmane.org, rdunlap-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org, thomas.lendacky-5C7GfCeVMHo@public.gmane.org, brijesh.singh-5C7GfCeVMHo@public.gmane.org, jon.grimm-5C7GfCeVMHo@public.gmane.org, eric.vantassell-5C7GfCeVMHo@public.gmane.org, pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org, frankja-tEXmvtCZX7AybS5Ee8rs3A@public.gmane.org, borntraeger-tA70FqPdS9bQT0dZR+AlfA@public.gmane.org, corbet-T1hC0tSOHrs@public.gmane.org, seanjc-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, vkuznets-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, wanpengli-1Nz4purKYjRBDgjK7y7TUQ@public.gmane.org, jmattson-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org, tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org, mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org, bp-Gina5bIWoIWzQB+pC5nmwQ@public.gmane.org, hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org, gingell-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, dionnaglaze-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, "Tian, Kevin" <kevin.tian-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "Liu, Yi L" <yi.l.liu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, "Raj, Ashok" <ashok.raj-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, Alex Williamson <alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Jason

Hi Tejun,

On Mon, 15 Mar 2021 19:54:36 -0400, Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org> wrote:

> Hello,
> 
> On Mon, Mar 15, 2021 at 04:40:12PM -0700, Jacob Pan wrote:
> > 2. then we want to move/migrate Process1 to cg_B. so we need uncharge
> > 10 of cg_A, charge 10 of cg_B  
> 
> So, what I don't get is why this migration is necessary. This isn't
> supported as a usage pattern and no one, at least in terms of wide-spread
> usage, does this. Why is this a requirement for your use case?
> 
I don't know if this is required. I thought utilities such as cgclassify
need to be supported.
" cgclassify - move running task(s) to given cgroups "
If no such use case, I am fine with dropping the migration support. Just
enforce limit on allocations.

> Thanks.
> 


Thanks,

Jacob