Date: Thu, 5 Nov 2015 11:12:18 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Eduardo Valentin <edubezval@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        LKML <linux-kernel@vger.kernel.org>,
        Arjan van de Ven <arjan@linux.intel.com>, Paul Turner <pjt@google.com>,
        Len Brown <len.brown@intel.com>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Andi Kleen <andi.kleen@intel.com>,
        Rafael Wysocki <rafael.j.wysocki@intel.com>
Subject: Re: [RFC PATCH 0/3] CFS idle injection
Message-ID: <20151105101218.GB3604@twins.programming.kicks-ass.net>
References: <1446509428-5616-1-git-send-email-jacob.jun.pan@linux.intel.com>
 <20151104060654.GC8850@localhost.localdomain>
 <20151104085830.010e69f8@yairi>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20151104085830.010e69f8@yairi>
User-Agent: Mutt/1.5.21 (2012-12-30)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1151
Lines: 28


People, trim your emails!

On Wed, Nov 04, 2015 at 08:58:30AM -0800, Jacob Pan wrote:

> > I also like #2 too. Specially now that it is not limited to a specific
> > platform. One question though, could you still keep the cooling device
> > support of it? In some systems, it might make sense to enable /
> > disable idle injections based on temperature.

> One of the key difference between 1 and 2 is that #2 is open loop
> control, since we don't have CPU c-states info baked into scheduler. 

_yet_, there's people working on that. The whole power aware scheduling
stuff needs that.
 
> To close the loop, perhaps we can export some internal APIs to the
> thermal subsystem then the thermal governors can pick the condition to
> inject idle.

I would much rather that all be part of the power aware stuff, such that
the scheduler itself is aware of thermal limits and can migrate load
away if needed.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/