linux-kernel - Re: [PATCH V2 2/3] sched/numa: Enhance vma scanning logic

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Message-ID: <Y/yAmDj6tQVfOdqK@hirez.programming.kicks-ass.net>
Date:   Mon, 27 Feb 2023 11:06:16 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Raghavendra K T <raghavendra.kt@....com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Ingo Molnar <mingo@...hat.com>, Mel Gorman <mgorman@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>, rppt@...nel.org,
        Bharata B Rao <bharata@....com>,
        Disha Talreja <dishaa.talreja@....com>
Subject: Re: [PATCH V2 2/3] sched/numa: Enhance vma scanning logic

On Mon, Feb 27, 2023 at 12:10:41PM +0530, Raghavendra K T wrote:
> In summary: I do see that access to VMAs from disjoint sets is not fully
>  fair, But on the other hand it is not very bad too. There is definitely
> some scope or possibility to explore/improve fairness in this area
> further.

Ok, might be good to summarize some of this in a comment near here, so
that readers are aware of the caveat of this code.

> PS: I have also tested above applying V3 patch (which incorporates your
> suggestions), have not seen much deviation in observation with patch.

I'll see if I can find it in this dumpester fire I call inbox :-)