linux-kernel - Re: [PATCH 3/4] sched,numa: implement numa node level wake

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Message-ID: <20170626144338.GA4941@worktop>
Date:   Mon, 26 Jun 2017 16:43:38 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     riel@...hat.com
Cc:     linux-kernel@...r.kernel.org, jhladky@...hat.com, mingo@...nel.org,
        mgorman@...e.de
Subject: Re: [PATCH 3/4] sched,numa: implement numa node level wake_affine

On Fri, Jun 23, 2017 at 12:55:29PM -0400, riel@...hat.com wrote:
> From: Rik van Riel <riel@...hat.com>
> 
> Since select_idle_sibling can place a task anywhere on a socket,
> comparing loads between individual CPU cores makes no real sense
> for deciding whether to do an affine wakeup across sockets, either.
> 
> Instead, compare the load between the sockets in a similar way the
> load balancer and the numa balancing code do.

This seems to assume LLC == NUMA, which isn't strictly so.