linux-kernel - Re: [PATCH v3] mm: readahead: make thp readahead conditional to mmap

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Message-Id: <20251007175343.107b17191734cddd7bbdeb54@linux-foundation.org>
Date: Tue, 7 Oct 2025 17:53:43 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Roman Gushchin <roman.gushchin@...ux.dev>
Cc: linux-kernel@...r.kernel.org, "Matthew Wilcox (Oracle)"
 <willy@...radead.org>, Jan Kara <jack@...e.cz>, Dev Jain
 <dev.jain@....com>, linux-mm@...ck.org
Subject: Re: [PATCH v3] mm: readahead: make thp readahead conditional to
 mmap_miss logic

On Tue, 07 Oct 2025 15:52:49 -0700 Roman Gushchin <roman.gushchin@...ux.dev> wrote:

> >> Signed-off-by: Roman Gushchin <roman.gushchin@...ux.dev>
> >> Cc: Matthew Wilcox (Oracle) <willy@...radead.org>
> >> Cc: Jan Kara <jack@...e.cz>
> >> Cc: Dev Jain <dev.jain@....com>
> >
> > But I'll slap the Fixes: in there, it might help someone.
> 
> I'd do exactly what you suggested: Fixes + no stable backport.
> 
> But I guess it still might end up in the LTS tree thanks to
> the automation picking up all fixes. Should be ok too.

They've been asked not to override the MM developers' decisions (ie, mm
is special).

I'm not sure how reliable this is...  And I'm not sure how they
identify the dont-do-that patches.  Maybe mm/*, maybe mm.git, maybe
s-o-b:akpm.  But I haven't seen any transgressions in a year or three.