linux-kernel - Re: [PATCH 02/11] mm/page_alloc: Convert per-cpu list protection to local

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Message-ID: <YHAPOKPTgJcLuDJl@hirez.programming.kicks-ass.net>
Date:   Fri, 9 Apr 2021 10:24:24 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Linux-MM <linux-mm@...ck.org>,
        Linux-RT-Users <linux-rt-users@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Chuck Lever <chuck.lever@...cle.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        Oscar Salvador <osalvador@...e.de>
Subject: Re: [PATCH 02/11] mm/page_alloc: Convert per-cpu list protection to
 local_lock

On Fri, Apr 09, 2021 at 08:59:39AM +0100, Mel Gorman wrote:
> In the end I just gave up and kept it simple as there is no benefit to
> !PREEMPT_RT which just disables IRQs. Maybe it'll be worth considering when
> PREEMPT_RT is upstream and can be enabled. The series was functionally
> tested on the PREEMPT_RT tree by reverting the page_alloc.c patch and
> applies this series and all of its prerequisites on top.

Right, I see the problem. Fair enough; perhaps ammend the changelog to
include some of that so that we can 'remember' in a few months why the
code is 'funneh'.