From: Matthew Wilcox <willy@infradead.org>
To: Zi Yan <ziy@nvidia.com>
Cc: linux-mm@kvack.org, "David Hildenbrand" <david@kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
linux-erofs@lists.ozlabs.org, linux-block@vger.kernel.org,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
"Lorenzo Stoakes" <lorenzo.stoakes@oracle.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>,
"Suren Baghdasaryan" <surenb@google.com>,
"Michal Hocko" <mhocko@suse.com>,
"Brendan Jackman" <jackmanb@google.com>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Jason Xing" <kernelxing@tencent.com>,
"Yushan Zhou" <katrinzhou@tencent.com>,
"Masami Hiramatsu (Google)" <mhiramat@kernel.org>,
"Vlastimil Babka" <vbabka@kernel.org>,
"Christoph Lameter" <cl@gentwo.org>,
"David Rientjes" <rientjes@google.com>,
"Roman Gushchin" <roman.gushchin@linux.dev>,
"Harry Yoo" <harry.yoo@oracle.com>,
"Christian Koenig" <christian.koenig@amd.com>,
"Huang Rui" <ray.huang@amd.com>,
"Matthew Auld" <matthew.auld@intel.com>,
"Matthew Brost" <matthew.brost@intel.com>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>, "Jens Axboe" <axboe@kernel.dk>,
"Christian Brauner" <brauner@kernel.org>,
"K Prateek Nayak" <kprateek.nayak@amd.com>,
"Davidlohr Bueso" <dave@stgolabs.net>,
"Eric Sandeen" <sandeen@redhat.com>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Arve Hjønnevåg" <arve@android.com>,
"Todd Kjos" <tkjos@android.com>,
"Carlos Llamas" <cmllamas@google.com>,
"Alice Ryhl" <aliceryhl@google.com>,
"Damien Le Moal" <dlemoal@kernel.org>,
"Johannes Thumshirn" <johannes.thumshirn@wdc.com>,
"Dennis Zhou" <dennis@kernel.org>, "Tejun Heo" <tj@kernel.org>,
"Gao Xiang" <xiang@kernel.org>, "Yue Hu" <zbestahu@gmail.com>,
"Jeffle Xu" <jefflexu@linux.alibaba.com>,
"Sandeep Dhavale" <dhavale@google.com>,
"Hongbo Li" <lihongbo22@huawei.com>,
"Chunhai Guo" <guochunhai@vivo.com>
Subject: Re: [PATCH v1 00/11] Zero page->private when freeing pages
Date: Mon, 23 Feb 2026 04:28:42 +0000 [thread overview]
Message-ID: <aZvXevheBMQ6LuUu@casper.infradead.org> (raw)
In-Reply-To: <20260223032641.1859381-1-ziy@nvidia.com>
On Sun, Feb 22, 2026 at 10:26:30PM -0500, Zi Yan wrote:
> Based on a recent discussion with David Hildenbrand on page->private
> is not zero when a page is freed[1], this patchset is trying to fix all
> users do not zero ->private when freeing a page and add checks to make
> sure all freed pages have ->private set to zero. For compound pages,
> both head page and tail pages need to have ->private set to zero.
Sorry, I didn't notice this conversation. It seems entirely unnecessary
to me to zero out page->private before freeing.
I'm a bit confused that ac1ea219590c was needed too; I thought we
cleared page->private in the allocation path, and I don't see why
it needs to be cleared in the freeing path. split_page() should be
clearing page->private.
Can we discuss this at the THP Cabal meeting on Wednesday? I don't
think that introducing this new rule that page->private must be cleared
by the users is a good idea.
next prev parent reply other threads:[~2026-02-23 4:29 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-23 3:26 Zi Yan
2026-02-23 3:26 ` [PATCH v1 01/11] relay: zero " Zi Yan
2026-02-23 3:26 ` [PATCH v1 02/11] mm/slub: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 03/11] drm/ttm: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 04/11] blk-mq: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 05/11] watch_queue: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 06/11] binder: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 07/11] null_blk: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 08/11] percpu: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 09/11] erofs: " Zi Yan
2026-02-23 3:26 ` [PATCH v1 10/11] mm/huge_memory: add page->private check back in __split_folio_to_order() Zi Yan
2026-02-23 3:26 ` [PATCH v1 11/11] mm/page_alloc: check page->private upon page free Zi Yan
2026-02-23 4:28 ` Matthew Wilcox [this message]
2026-02-23 8:40 ` [syzbot ci] Re: Zero page->private when freeing pages syzbot ci
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=aZvXevheBMQ6LuUu@casper.infradead.org \
--to=willy@infradead.org \
--cc=Liam.Howlett@oracle.com \
--cc=airlied@gmail.com \
--cc=akpm@linux-foundation.org \
--cc=aliceryhl@google.com \
--cc=arve@android.com \
--cc=axboe@kernel.dk \
--cc=baohua@kernel.org \
--cc=baolin.wang@linux.alibaba.com \
--cc=brauner@kernel.org \
--cc=christian.koenig@amd.com \
--cc=cl@gentwo.org \
--cc=cmllamas@google.com \
--cc=dave@stgolabs.net \
--cc=david@kernel.org \
--cc=dennis@kernel.org \
--cc=dev.jain@arm.com \
--cc=dhavale@google.com \
--cc=dlemoal@kernel.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=gregkh@linuxfoundation.org \
--cc=guochunhai@vivo.com \
--cc=hannes@cmpxchg.org \
--cc=harry.yoo@oracle.com \
--cc=jackmanb@google.com \
--cc=jefflexu@linux.alibaba.com \
--cc=johannes.thumshirn@wdc.com \
--cc=katrinzhou@tencent.com \
--cc=kernelxing@tencent.com \
--cc=kprateek.nayak@amd.com \
--cc=lance.yang@linux.dev \
--cc=lihongbo22@huawei.com \
--cc=linux-block@vger.kernel.org \
--cc=linux-erofs@lists.ozlabs.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=lorenzo.stoakes@oracle.com \
--cc=maarten.lankhorst@linux.intel.com \
--cc=matthew.auld@intel.com \
--cc=matthew.brost@intel.com \
--cc=mhiramat@kernel.org \
--cc=mhocko@suse.com \
--cc=mripard@kernel.org \
--cc=npache@redhat.com \
--cc=ray.huang@amd.com \
--cc=rientjes@google.com \
--cc=roman.gushchin@linux.dev \
--cc=ryan.roberts@arm.com \
--cc=sandeen@redhat.com \
--cc=simona@ffwll.ch \
--cc=surenb@google.com \
--cc=tj@kernel.org \
--cc=tkjos@android.com \
--cc=tzimmermann@suse.de \
--cc=vbabka@kernel.org \
--cc=xiang@kernel.org \
--cc=zbestahu@gmail.com \
--cc=ziy@nvidia.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox