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Date: Wed, 7 Oct 2026 11:32:12 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Kiryl Shutsemau <kirill@shutemov.name>
Cc: Vlastimil Babka <vbabka@kernel.org>, Johannes Weiner
 <hannes@cmpxchg.org>, David Hildenbrand <david@kernel.org>, Harry Yoo
 <harry@kernel.org>, Suren Baghdasaryan <surenb@google.com>, Michal Hocko
 <mhocko@suse.com>, Brendan Jackman <brendan.jackman@linux.dev>, Zi Yan
 <ziy@nvidia.com>, Shakeel Butt <shakeel.butt@linux.dev>, Usama Arif
 <usama.arif@linux.dev>, linux-mm@kvack.org, linux-kernel@vger.kernel.org,
 stable@vger.kernel.org, kernel-team@meta.com
Subject: Re: [PATCH v2] mm: page_alloc: make defrag_mode retries follow the
 promoted order
Message-Id: <20261007113212.1fa804db80cc6f534ca01a59@linux-foundation.org>
In-Reply-To: <asZCEttmL6VlMXKc@thinkstation>
References: <20261006091815.897133-1-kirill@shutemov.name>
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On Wed, 7 Oct 2026 14:01:33 +0100 Kiryl Shutsemau <kirill@shutemov.name> wrote:

> > > v2:
> > >  - keep the compaction priority floor and the COMPACT_SUCCESS retry
> > >    limit on the request order, so non-costly requests still escalate to
> > >    SYNC_FULL before falling back (Harry Yoo, Johannes Weiner)
> > >  - compute the promoted order once in __alloc_pages_slowpath() and pass
> > >    it to direct reclaim, direct compaction and the retry helpers, instead
> > >    of each of them deriving it (Harry Yoo)
> > 
> > Thanks.  That's a fairly large update.  v2 diff is below.
> > 
> > Are we sure about cc:stable?  Or even 7.3-rcX?  It's a pretty big
> > change.
> 
> I think defrag_mode is not widely used. Maybe only in Meta.
> 
> What about keeping cc:stable, but only submit it to Linus for v7.4-rc1?
> 
> By the time we would have the patch battle-tested in the fleet.

OK, let's do that.