From: Hugh Dickins <hughd@google.com>
To: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>, Chris Li <chrisl@kernel.org>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Janosch Frank <frankja@linux.ibm.com>,
Claudio Imbrenda <imbrenda@linux.ibm.com>,
David Hildenbrand <david@redhat.com>,
Alexander Gordeev <agordeev@linux.ibm.com>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Sven Schnelle <svens@linux.ibm.com>,
Peter Xu <peterx@redhat.com>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Christian Brauner <brauner@kernel.org>, Jan Kara <jack@suse.cz>,
Arnd Bergmann <arnd@arndb.de>, Zi Yan <ziy@nvidia.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
"Liam R . Howlett" <Liam.Howlett@oracle.com>,
Nico Pache <npache@redhat.com>,
Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
Barry Song <baohua@kernel.org>,
Lance Yang <lance.yang@linux.dev>,
Muchun Song <muchun.song@linux.dev>,
Oscar Salvador <osalvador@suse.de>,
Vlastimil Babka <vbabka@suse.cz>,
Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>,
Matthew Brost <matthew.brost@intel.com>,
Joshua Hahn <joshua.hahnjy@gmail.com>,
Rakie Kim <rakie.kim@sk.com>, Byungchul Park <byungchul@sk.com>,
Gregory Price <gourry@gourry.net>,
Ying Huang <ying.huang@linux.alibaba.com>,
Alistair Popple <apopple@nvidia.com>,
Axel Rasmussen <axelrasmussen@google.com>,
Yuanchu Xie <yuanchu@google.com>, Wei Xu <weixugc@google.com>,
Kemeng Shi <shikemeng@huaweicloud.com>,
Kairui Song <kasong@tencent.com>, Nhat Pham <nphamcs@gmail.com>,
Baoquan He <bhe@redhat.com>, SeongJae Park <sj@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
Leon Romanovsky <leon@kernel.org>, Xu Xin <xu.xin16@zte.com.cn>,
Chengming Zhou <chengming.zhou@linux.dev>,
Jann Horn <jannh@google.com>, Miaohe Lin <linmiaohe@huawei.com>,
Naoya Horiguchi <nao.horiguchi@gmail.com>,
Pedro Falcato <pfalcato@suse.de>,
Pasha Tatashin <pasha.tatashin@soleen.com>,
Rik van Riel <riel@surriel.com>,
Harry Yoo <harry.yoo@oracle.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
linux-s390@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-mm@kvack.org, linux-arch@vger.kernel.org,
damon@lists.linux.dev
Subject: Re: [PATCH v2 00/16] mm: remove is_swap_[pte, pmd]() + non-swap entries, introduce leaf entries
Date: Mon, 10 Nov 2025 20:07:34 -0800 (PST) [thread overview]
Message-ID: <ba5d8603-4140-1678-b2d5-d49ab1a40fe0@google.com> (raw)
In-Reply-To: <20251110162313.baee36f4815b3aeb3f12921e@linux-foundation.org>
On Mon, 10 Nov 2025, Andrew Morton wrote:
> On Mon, 10 Nov 2025 15:38:55 -0800 (PST) Hugh Dickins <hughd@google.com> wrote:
>
> > > I'm sorry but this is not a reasonable request. I am being as empathetic and
> > > kind as I can be here, but this series is proceeding without arbitrary delay.
> > >
> > > I will do everything I can to accommodate any concerns or issues you may have
> > > here _within reason_ :)
> >
> > But Lorenzo, have you even tested your series properly yet, with
> > swapping and folio migration and huge pages and tmpfs under load?
> > Please do.
> >
> > I haven't had time to bisect yet, maybe there's nothing more needed
> > than a one-liner fix somewhere; but from my experience it is not yet
> > ready for inclusion in mm and next - it stops testing other folks' work.
> >
> > I haven't tried today's v3, but from the cover letter of differences,
> > it didn't look like much of importance is fixed since v2: which
> > (after a profusion of "Bad swap offet entry 3ffffffffffff" messages,
> > not seen with v1, and probably not really serious) soon hits an Oops
> > or a BUG or something (as v1 did) - I don't have any logs or notes
> > to give yet, just forewarning before pursuing later in the day.
> >
> > If you think v3 has fixed real crashes under load, please say so:
> > otherwise, I doubt it's worth Andrew hurrying to replace v2 by v3.
>
> Oh. Thanks. I'll move the v3 series into mm-new for now.
Lorenzo, I can happily apologize: the v3 series in mm-everything-
2025-11-11-01-20 is a big improvement over v2 and v1, it is showing
none of the bad behaviours I saw with those. I've not searched or
compared for what actually fixed those symptoms (though have now
spotted mails from Shivank and Kairui regarding 3ffffffffffff),
I'm content now to move on to unrelated work...
Thanks,
Hugh
next prev parent reply other threads:[~2025-11-11 4:07 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-08 17:08 Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 01/16] mm: correctly handle UFFD PTE markers Lorenzo Stoakes
2025-11-09 16:26 ` Lance Yang
2025-11-10 6:36 ` Lorenzo Stoakes
2025-11-10 11:17 ` Mike Rapoport
2025-11-10 13:01 ` Lorenzo Stoakes
2025-11-10 13:44 ` Mike Rapoport
2025-11-10 18:05 ` Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 02/16] mm: introduce leaf entry type and use to simplify leaf entry logic Lorenzo Stoakes
2025-11-09 12:34 ` Lance Yang
2025-11-10 18:48 ` Lorenzo Stoakes
2025-11-09 13:10 ` Kairui Song
2025-11-10 18:34 ` Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 03/16] mm: avoid unnecessary uses of is_swap_pte() Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 04/16] mm: eliminate is_swap_pte() when softleaf_from_pte() suffices Lorenzo Stoakes
2025-11-09 12:49 ` Kairui Song
2025-11-10 19:38 ` Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 05/16] mm: use leaf entries in debug pgtable + remove is_swap_pte() Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 06/16] fs/proc/task_mmu: refactor pagemap_pmd_range() Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 07/16] mm: avoid unnecessary use of is_swap_pmd() Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 08/16] mm/huge_memory: refactor copy_huge_pmd() non-present logic Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 09/16] mm/huge_memory: refactor change_huge_pmd() " Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 10/16] mm: replace pmd_to_swp_entry() with softleaf_from_pmd() Lorenzo Stoakes
2025-11-08 17:18 ` SeongJae Park
2025-11-10 22:03 ` Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 11/16] mm: introduce pmd_is_huge() and use where appropriate Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 12/16] mm: remove remaining is_swap_pmd() users and is_swap_pmd() Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 13/16] mm: remove non_swap_entry() and use softleaf helpers instead Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 14/16] mm: remove is_hugetlb_entry_[migration, hwpoisoned]() Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 15/16] mm: eliminate further swapops predicates Lorenzo Stoakes
2025-11-08 17:08 ` [PATCH v2 16/16] mm: replace remaining pte_to_swp_entry() with softleaf_from_pte() Lorenzo Stoakes
2025-11-08 18:01 ` [PATCH v2 00/16] mm: remove is_swap_[pte, pmd]() + non-swap entries, introduce leaf entries Andrew Morton
2025-11-10 7:32 ` Chris Li
2025-11-10 10:18 ` Lorenzo Stoakes
2025-11-10 11:04 ` Chris Li
2025-11-10 11:27 ` Lorenzo Stoakes
2025-11-10 23:38 ` Hugh Dickins
2025-11-11 0:23 ` Andrew Morton
2025-11-11 4:07 ` Hugh Dickins [this message]
2025-11-11 6:51 ` Lorenzo Stoakes
2025-11-11 4:16 ` Kairui Song
2025-11-11 6:55 ` Lorenzo Stoakes
2025-11-11 9:19 ` Chris Li
2025-11-11 10:03 ` Lorenzo Stoakes
2025-11-10 22:21 Lorenzo Stoakes
2025-11-10 22:24 ` Lorenzo Stoakes
2025-11-11 0:17 ` Andrew Morton
2025-11-21 23:44 ` Jason Gunthorpe
2025-11-24 10:06 ` Lorenzo Stoakes
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