linux-kernel - Re: [PATCH 3/3] sched: limit cpu search and rotate search window for scalability

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Message-ID: <212e5820-a9fe-70fb-90b7-d0503342c742@oracle.com>
Date:   Tue, 24 Apr 2018 15:43:36 -0700
From:   Subhra Mazumdar <subhra.mazumdar@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        daniel.lezcano@...aro.org, steven.sistare@...cle.com,
        dhaval.giani@...cle.com, rohit.k.jain@...cle.com
Subject: Re: [PATCH 3/3] sched: limit cpu search and rotate search window for
 scalability



On 04/24/2018 05:48 AM, Peter Zijlstra wrote:
> On Mon, Apr 23, 2018 at 05:41:16PM -0700, subhra mazumdar wrote:
>> +	if (per_cpu(next_cpu, target) != -1)
>> +		target_tmp = per_cpu(next_cpu, target);
>> +	else
>> +		target_tmp = target;
>> +
> This one; what's the point here?
Want to start search from target first time and from the next_cpu next time
onwards. If this doesn't many any difference in performance I can change
it. Will require re-running all the tests.