linux-kernel - Re: [RESEND RFC PATCH V3] sched: Improve scalability of select_idle

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Message-ID: <20180201133343.GJ2295@hirez.programming.kicks-ass.net>
Date:   Thu, 1 Feb 2018 14:33:44 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     subhra mazumdar <subhra.mazumdar@...cle.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        steven.sistare@...cle.com, dhaval.giani@...cle.com
Subject: Re: [RESEND RFC PATCH V3] sched: Improve scalability of
 select_idle_sibling using SMT balance

On Thu, Feb 01, 2018 at 01:33:35PM +0100, Peter Zijlstra wrote:
> I think you want to go allocate sched_domain_shared for the MC level and
> use that, much like sd_llc_shared.

Also, you'd want to try and get performance numbers for something like
Power8, which has SMT8 and fairly expensive atomic ops.