linux-kernel - Re: [PATCH 3/4] perf cgroup: Add cgroup ID as a key of RB tree

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Date:   Tue, 30 Apr 2019 11:03:18 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     kan.liang@...ux.intel.com
Cc:     tglx@...utronix.de, mingo@...hat.com, linux-kernel@...r.kernel.org,
        eranian@...gle.com, tj@...nel.org, ak@...ux.intel.com
Subject: Re: [PATCH 3/4] perf cgroup: Add cgroup ID as a key of RB tree

On Mon, Apr 29, 2019 at 07:44:04AM -0700, kan.liang@...ux.intel.com wrote:

> Add unique cgrp_id for each cgroup, which is composed by CPU ID and css
> subsys-unique ID.

*WHY* ?! that doesn't make any kind of sense.. In fact you mostly then
use the low word because most everything is already per CPU.