Date: Fri, 20 Nov 2015 11:20:14 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Morten Rasmussen <morten.rasmussen@arm.com>,
        Arjan van de Ven <arjan@linux.intel.com>,
        Jacob Pan <jacob.jun.pan@linux.intel.com>,
        Ingo Molnar <mingo@redhat.com>, John Stultz <john.stultz@linaro.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>,
        Len Brown <len.brown@intel.com>,
        Rafael Wysocki <rafael.j.wysocki@intel.com>,
        Eduardo Valentin <edubezval@gmail.com>, Paul Turner <pjt@google.com>
Subject: Re: [PATCH 3/4] sched: introduce synchronized idle injection
Message-ID: <20151120102014.GC17308@twins.programming.kicks-ass.net>
References: <1447444387-23525-1-git-send-email-jacob.jun.pan@linux.intel.com>
 <1447444387-23525-4-git-send-email-jacob.jun.pan@linux.intel.com>
 <20151118154457.GD30184@e105550-lin.cambridge.arm.com>
 <564C9E93.8030901@linux.intel.com>
 <20151119172405.GA798@e105550-lin.cambridge.arm.com>
 <20151119200906.GS3816@twins.programming.kicks-ass.net>
 <alpine.DEB.2.11.1511201032300.3989@nanos>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <alpine.DEB.2.11.1511201032300.3989@nanos>
User-Agent: Mutt/1.5.21 (2012-12-30)
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 684
Lines: 18

On Fri, Nov 20, 2015 at 10:45:14AM +0100, Thomas Gleixner wrote:

> The whole concept of faking idle is simply crap.

:-)

> If you want to avoid that stuff in the scheduler, then create a
> mechanism which just defers the next timer interrupt for X
> milliseconds and does not any fiddling with NOHZ state and such.

Not sure that will actually result in the machine going idle. Device
interrupts will still wake tasks and get them ran.

--
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/