linux-kernel - Re: [PATCH 1/7] mm/page_alloc: Rename ALLOC_HIGH to ALLOC_MIN

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Message-ID: <20230112092610.msowgtidt2a7zo4w@techsingularity.net>
Date:   Thu, 12 Jan 2023 09:26:10 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Michal Hocko <mhocko@...e.com>
Cc:     Linux-MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        NeilBrown <neilb@...e.de>,
        Thierry Reding <thierry.reding@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/7] mm/page_alloc: Rename ALLOC_HIGH to ALLOC_MIN_RESERVE

On Wed, Jan 11, 2023 at 04:18:50PM +0100, Michal Hocko wrote:
> On Mon 09-01-23 15:16:25, Mel Gorman wrote:
> > __GFP_HIGH aliases to ALLOC_HIGH but the name does not really hint
> > what it means. As ALLOC_HIGH is internal to the allocator, rename
> > it to ALLOC_MIN_RESERVE to document that the min reserves can
> > be depleted.
> > 
> > Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
> > Acked-by: Vlastimil Babka <vbabka@...e.cz>
> 
> Naming is hard but ALLOC_HIGH is definitely much more confusing as it
> can collide with high watermark. ALLOC_MIN_RESERVE says that some
> reserves are involved. ALl the reserves are below min watermark by
> defition but I cannot really come up with a better name. I do not think
> we want to encode the amount of reserves into the name.
> 

It's internal to the page allocator so I didn't sweat about it too much.
Access to the reserves currently means "allow pages to be allocated
below the min reserve". Even if that changes in the future, the name can
change with it.

> Acked-by: Michal Hocko <mhocko@...e.com>
> 

Thanks!

-- 
Mel Gorman
SUSE Labs