Date: Mon, 27 Jul 2015 02:43:25 +0800
From: Yuyang Du <yuyang.du@intel.com>
To: Boqun Feng <boqun.feng@gmail.com>
Cc: mingo@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org,
        pjt@google.com, bsegall@google.com, morten.rasmussen@arm.com,
        vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
        umgwanakikbuti@gmail.com, len.brown@intel.com,
        rafael.j.wysocki@intel.com, arjan@linux.intel.com,
        fengguang.wu@intel.com
Subject: Re: [PATCH v10 6/7] sched: Provide runnable_load_avg back to cfs_rq
Message-ID: <20150726184325.GB28512@intel.com>
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 <20150721010346.GA2882@fixme-laptop.cn.ibm.com>
 <20150721004400.GA28512@intel.com>
 <20150721101845.GB2882@fixme-laptop.cn.ibm.com>
 <20150721102956.GA5380@fixme-laptop.cn.ibm.com>
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Hi Boqun,

On Tue, Jul 21, 2015 at 06:29:56PM +0800, Boqun Feng wrote:
> The point is that you have already tracked the sum of runnable_load_avg
> and blocked_load_avg in cfs_rq->avg.load_avg. If you're going to track
> part of the sum, you'd better track the one that's updated less
> frequently, right?
> 
> Anyway, this idea just comes into my mind. I wonder which is udpated
> less frequently myself too. ;-) So I ask to see whether there is
> something we can improve.

Actually, this is not the point.

1) blocked load is more "difficult" to track, hint, migrate.

2) r(t1) - b(t2) is not anything, hint, t1 != t2
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