linux-kernel - [PATCH RFC v2 0/3] tweaks for __alloc_pages

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Message-Id: <20251219-thp-thisnode-tweak-v2-0-0c01f231fd1c@suse.cz>
Date: Fri, 19 Dec 2025 18:38:50 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>, 
 Brendan Jackman <jackmanb@...gle.com>, Johannes Weiner <hannes@...xchg.org>, 
 Zi Yan <ziy@...dia.com>, David Rientjes <rientjes@...gle.com>, 
 David Hildenbrand <david@...nel.org>, 
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Mike Rapoport <rppt@...nel.org>, Joshua Hahn <joshua.hahnjy@...il.com>, 
 Pedro Falcato <pfalcato@...e.de>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
 Vlastimil Babka <vbabka@...e.cz>
Subject: [PATCH RFC v2 0/3] tweaks for __alloc_pages_slowpath()

RFC, feel free to ignore until next year... Sending just in case
some feedback will materialize.

Since v1 the main motivating fix (patch 1 of v1) was sent separately:
https://lore.kernel.org/all/20251219-costly-noretry-thisnode-fix-v1-1-e1085a4a0c34@suse.cz/

In patch 2 of v1 I have proposed not to attempt reclaim for costly
__GFP_NORETRY allocations at all. Johannes suggested that we should not
change the semantics that much, so now instead we allow them all (except
with __GFP_THISNODE). The main idea that remains is that we don't decide
based on the exact compaction result anymore.

Patch 3 is a cleanup also based on a suggestion from Johannes, and Patch
4 became the obvious next step in that direction. These should be making
no functional changes.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
Changes in v2:
- actual THP reclaim fix sent separately
- allow one reclaim attempt for __GFP_NORETRY allocations
- further __alloc_pages_slowpath() cleanups
- Link to v1: https://patch.msgid.link/20251216-thp-thisnode-tweak-v1-0-0e499d13d2eb@suse.cz

---
Vlastimil Babka (3):
      mm/page_alloc: ignore the exact initial compaction result
      mm/page_alloc: refactor the initial compaction handling
      mm/page_alloc: simplify __alloc_pages_slowpath() flow

 mm/page_alloc.c | 169 ++++++++++++++++++++++++++------------------------------
 1 file changed, 77 insertions(+), 92 deletions(-)
---
base-commit: 81a5997c0d5ac4cb3ce65f1128197cb751ccd15b
change-id: 20251216-thp-thisnode-tweak-c9c2acb3a627

Best regards,
-- 
Vlastimil Babka <vbabka@...e.cz>