linux-kernel - Re: [PATCH 03/19] sched/numa: Simplify load_too

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Date:   Mon, 04 Jun 2018 10:57:18 -0400
From:   Rik van Riel <riel@...riel.com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 03/19] sched/numa: Simplify load_too_imbalanced

On Mon, 2018-06-04 at 15:30 +0530, Srikar Dronamraju wrote:
> Currently load_too_imbalance() cares about the slope of imbalance.
> It doesn't care of the direction of the imbalance.
> 
> However this may not work if nodes that are being compared have
> dissimilar capacities. Few nodes might have more cores than other
> nodes
> in the system. Also unlike traditional load balance at a NUMA sched
> domain, multiple requests to migrate from the same source node to
> same
> destination node may run in parallel. This can cause huge load
> imbalance. This is specially true on a larger machines with either
> large
> cores per node or more number of nodes in the system. Hence allow
> move/swap only if the imbalance is going to reduce.

> Signed-off-by: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>

Reviewed-by: Rik van Riel <riel@...riel.com>

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