linux-kernel - Re: [PATCH v2 1/2] mm/page_alloc: use ac->high_zoneidx for classzone

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Message-ID: <CAAmzW4OC56g-37SghVVsN=4tnxMwfavkK2z31abZnBh5o9J4ag@mail.gmail.com>
Date:   Fri, 20 Mar 2020 16:33:54 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Minchan Kim <minchan@...nel.org>,
        Mel Gorman <mgorman@...hsingularity.net>, kernel-team@....com,
        Ye Xiaolong <xiaolong.ye@...el.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [PATCH v2 1/2] mm/page_alloc: use ac->high_zoneidx for classzone_idx

2020년 3월 19일 (목) 오후 9:21, Vlastimil Babka <vbabka@...e.cz>님이 작성:
>
> On 3/19/20 9:57 AM, Joonsoo Kim wrote:
> >> Curious: is this only an issue when vm.numa_zonelist_order is set to Node?
> >
> > Do you mean "/proc/sys/vm/numa_zonelist_order"? It looks like it's gone now.
> >
> > Thanks.
>
> Yes it's gone now, but indeed, AFAIU on older kernels with zone order instead of
> node order, this problem wouldn't manifest.

Yes. In this case, preferred_zone of an allocation is the populated highest zone
among all nodes so classzone_idx will the same.

Thanks.