linux-kernel - Re: [PATCH 5/9] x86/intel_rdt: Add new cgroup and Class of service management

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Message-ID: <20150804183659.GG17598@mtj.duckdns.org>
Date:	Tue, 4 Aug 2015 14:36:59 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Vikas Shivappa <vikas.shivappa@...ux.intel.com>,
	linux-kernel@...r.kernel.org, vikas.shivappa@...el.com,
	x86@...nel.org, hpa@...or.com, tglx@...utronix.de,
	mingo@...nel.org, peterz@...radead.org, matt.fleming@...el.com,
	will.auld@...el.com, glenn.p.williamson@...el.com,
	kanaka.d.juvva@...el.com
Subject: Re: [PATCH 5/9] x86/intel_rdt: Add new cgroup and Class of service
 management

Hello,

On Tue, Aug 04, 2015 at 09:55:20AM -0300, Marcelo Tosatti wrote:
...
> Can't "cacheset" helper (similar to taskset) talk to systemd
> to achieve the flexibility you point ?

I don't know.  This is the case in point.  You're now suggesting doing
things completely backwards - a thread of an application talking to
external agent to tweak system management interface so that it can
change the attribute of that thread.  Let's please build a
programmable interface first.  I'm sure there are use cases which
aren't gonna be covered 100% but at the same time I'm sure just simple
inheritable per-thread attribute would cover majority of use cases.
This really isn't that different from CPU affinity after all.  *If* it
turns out that a lot of people yearn for fully hierarchical
enforcement, we sure can do that in the future but at this point it
really looks like an overkill in the wrong direction.

Thanks.

-- 
tejun
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