Date: Fri, 6 Nov 2015 08:45:10 +0100
From: Peter Zijlstra <peterz@infradead.org>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: 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 3/3] sched: introduce synchronized idle injection
Message-ID: <20151106074510.GM3604@twins.programming.kicks-ass.net>
References: <1446509428-5616-1-git-send-email-jacob.jun.pan@linux.intel.com>
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On Thu, Nov 05, 2015 at 03:36:25PM -0800, Jacob Pan wrote:

> I did some testing with the code below, it shows random
> [  150.442597] NOHZ: local_softirq_pending 02
> [  153.032673] NOHZ: local_softirq_pending 202
> [  153.203785] NOHZ: local_softirq_pending 202
> [  153.206486] NOHZ: local_softirq_pending 282
> I recalled that was why i checked for local_softirq_pending in the
> initial patch, still trying to find out how we can avoid that. These
> also causes non stop sched ticks in the inner idle loop.

Check the softirq stuff before calling throttle ?
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