From: Vlastimil Babka <vbabka@suse.cz>
To: Andrew Morton <akpm@linux-foundation.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Brendan Jackman <jackmanb@google.com>,
Johannes Weiner <hannes@cmpxchg.org>, Zi Yan <ziy@nvidia.com>,
David Rientjes <rientjes@google.com>,
David Hildenbrand <david@kernel.org>,
Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Mike Rapoport <rppt@kernel.org>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Pedro Falcato <pfalcato@suse.de>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Vlastimil Babka <vbabka@suse.cz>
Subject: [PATCH RFC 0/2] tweaks for costly order __GFP_NORETRY reclaim
Date: Tue, 16 Dec 2025 16:54:20 +0100 [thread overview]
Message-ID: <20251216-thp-thisnode-tweak-v1-0-0e499d13d2eb@suse.cz> (raw)
This is motivated by an excessive reclaim issue we saw in a customer
workload and was associated with THP page faults and an unexpected
zone_reclaim_mode-like behavior that can happen for those.
The first patch is intended as a minimal targeted backportable fix for
the observed issue. I hope I'll be able to confirm it has fixed the
problem, but it might take some time.
The second patch is a more "let's take a step back and rethink what
we're doing here" so it's separate, as it changes a bit the semantics
of __GFP_NORETRY.
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---
Vlastimil Babka (2):
mm, page_alloc, thp: prevent reclaim for __GFP_THISNODE THP allocations
mm, page_alloc: fail costly __GFP_NORETRY allocations faster
include/linux/gfp_types.h | 2 ++
mm/page_alloc.c | 33 +++------------------------------
2 files changed, 5 insertions(+), 30 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251216-thp-thisnode-tweak-c9c2acb3a627
Best regards,
--
Vlastimil Babka <vbabka@suse.cz>
next reply other threads:[~2025-12-16 15:54 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-16 15:54 Vlastimil Babka [this message]
2025-12-16 15:54 ` [PATCH RFC 1/2] mm, page_alloc, thp: prevent reclaim for __GFP_THISNODE THP allocations Vlastimil Babka
2025-12-16 16:26 ` Michal Hocko
2025-12-16 20:11 ` Johannes Weiner
2025-12-16 20:23 ` Zi Yan
2025-12-17 15:53 ` Pedro Falcato
2025-12-16 15:54 ` [PATCH RFC 2/2] mm, page_alloc: fail costly __GFP_NORETRY allocations faster Vlastimil Babka
2025-12-16 16:28 ` Michal Hocko
2025-12-16 20:32 ` Johannes Weiner
2025-12-17 8:46 ` Vlastimil Babka
2025-12-17 16:35 ` Johannes Weiner
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