linux-kernel - RE: [RFD] resctrl: reassigning a running container's CTRL

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Date:   Fri, 21 Oct 2022 20:22:18 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     "Chatre, Reinette" <reinette.chatre@...el.com>,
        James Morse <james.morse@....com>,
        Peter Newman <peternewman@...gle.com>
CC:     "Yu, Fenghua" <fenghua.yu@...el.com>,
        "Eranian, Stephane" <eranian@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Babu Moger" <Babu.Moger@....com>,
        Gaurang Upasani <gupasani@...gle.com>
Subject: RE: [RFD] resctrl: reassigning a running container's CTRL_MON group

> I am not viewing this as "secretly-two-control-groups" - there would still be
> only one parent CTRL_MON group that dictates all the allocations. MON groups already
> have a CLOSID (PARTID) property but at this time it is always identical to the parent
> CTRL_MON group. The difference introduced is that some of the child MON groups
> may have a different CLOSID (PARTID) from the parent.

What would be the resctrl file system operation to change the CLOSID of a child
CTRL_MON group?

I followed the "use rename" so the user would:

	# mv /sys/fs/resctrl/g1/mon_groups/work1 /sys/fs/resctrl/g2/mon_groups/

to keep the same RMID, but move from "g1" to "g2" to get a different class of service.

-Tony