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

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Message-ID: <875xcqi1sn.fsf@linux.dev>
Date: Tue, 07 Oct 2025 19:07:36 -0700
From: Roman Gushchin <roman.gushchin@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>
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

Andrew Morton <akpm@...ux-foundation.org> writes:

> 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.

Nice! I didn't know this.