linux-kernel - Re: [PATCH] sched/fair: Consider cpu affinity when allowing NUMA imbalance in find_idlest

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Message-ID: <YgP30sLEQfYPsMZE@hirez.programming.kicks-ass.net>
Date:   Wed, 9 Feb 2022 18:20:18 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Nayak, K Prateek" <KPrateek.Nayak@....com>
Cc:     "aubrey.li@...ux.intel.com" <aubrey.li@...ux.intel.com>,
        "efault@....de" <efault@....de>,
        "Shenoy, Gautham Ranjal" <gautham.shenoy@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mgorman@...hsingularity.net" <mgorman@...hsingularity.net>,
        "mingo@...nel.org" <mingo@...nel.org>,
        "song.bao.hua@...ilicon.com" <song.bao.hua@...ilicon.com>,
        "srikar@...ux.vnet.ibm.com" <srikar@...ux.vnet.ibm.com>,
        "valentin.schneider@....com" <valentin.schneider@....com>,
        "vincent.guittot@...aro.org" <vincent.guittot@...aro.org>
Subject: Re: [PATCH] sched/fair: Consider cpu affinity when allowing NUMA
 imbalance in find_idlest_group

On Wed, Feb 09, 2022 at 03:14:32PM +0000, Nayak, K Prateek wrote:
> [AMD Official Use Only]

I think you need to invest in a new mail setup.

> > Where does this affinity come from?
> 
> The affinity comes from limiting the process to a certain subset of
> available cpus by modifying the cpus_ptr member of task_struck
> via taskset or numactl.

That's obviously not an answer. Why is that done?