linux-kernel - Re: [PATCH v2 2/2] mm/page_alloc: integrate classzone_idx and high

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Date:   Fri, 20 Mar 2020 16:40:42 +0900
From:   Joonsoo Kim <js1304@...il.com>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     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 2/2] mm/page_alloc: integrate classzone_idx and high_zoneidx

2020년 3월 19일 (목) 오후 9:32, Vlastimil Babka <vbabka@...e.cz>님이 작성:
>
> On 3/18/20 4:32 AM, js1304@...il.com wrote:
> > From: Joonsoo Kim <iamjoonsoo.kim@....com>
> >
> > classzone_idx is just different name for high_zoneidx now.
> > So, integrate them and add some comment to struct alloc_context
> > in order to reduce future confusion about the meaning of this variable.
> >
> > In addition to integration, this patch also renames high_zoneidx
> > to highest_zoneidx since it represents more precise meaning.
>
> 2 years ago I suggested max_zone_idx.
> Not insisting, but perhaps max_zoneidx would simply be shorter than
> highest_zoneidx, while saying the same thing?

I think that highest_zoneidx looks more familiar than max_zoneidx since
it is previously high_zoneidx. It would cause less confusion.

> Also I wonder if we still need the accessor ac_classzone_idx() (before rename),
> or just replace it with ac->highest_zoneidx (or whatever the final name is)
> instead of renaming it?

Okay. Looks like we don't need the accessor. I will use open-code.

Thanks.