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From: Daejun Park <daejun7.park@samsung.com>
To: Zi Yan <ziy@nvidia.com>, Andrew Morton <akpm@linux-foundation.org>
Cc: Tao Yi <escape@deepseek.com>,
	Johannes Weiner <hannes@cmpxchg.org>,
	Michal Hocko <mhocko@kernel.org>,
	Roman Gushchin <roman.gushchin@linux.dev>,
	Shakeel Butt <shakeel.butt@linux.dev>,
	Muchun Song <muchun.song@linux.dev>,
	David Hildenbrand <david@kernel.org>,
	Matthew Wilcox <willy@infradead.org>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	"Liam R. Howlett" <liam@infradead.org>,
	Nico Pache <nico.pache@linux.dev>,
	Ryan Roberts <ryan.roberts@arm.com>, Dev Jain <dev.jain@arm.com>,
	Barry Song <baohua@kernel.org>, Lance Yang <lance.yang@linux.dev>,
	Usama Arif <usama.arif@linux.dev>,
	Kiryl Shutsemau <kas@kernel.org>,
	Vlastimil Babka <vbabka@kernel.org>,
	Suren Baghdasaryan <surenb@google.com>,
	Brendan Jackman <brendan.jackman@linux.dev>,
	"linux-mm@kvack.org" <linux-mm@kvack.org>,
	"cgroups@vger.kernel.org" <cgroups@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"stable@vger.kernel.org" <stable@vger.kernel.org>,
	Daejun Park <daejun7.park@samsung.com>
Subject: RE:(2) [PATCH 1/2] mm/huge_memory: set memcg_data before a split page leaves the folio
Date: Thu, 05 Nov 2026 10:06:12 +0900	[thread overview]
Message-ID: <20261105010612epcms2p60abe5ce24c4ca7d61236b613a517fe2a@epcms2p6> (raw)
In-Reply-To: <DMMKKOIGA9UJ.353PCUUMFLCCJ@nvidia.com>

On Wed Nov 4, 2026 at 11:33 AM EST, Zi Yan wrote:
> Assign memcg data before clear_compound_head(), so lockless,
> reference-free readers get the right value instead of bogus data from
> the overlaid ->_nr_pages in the first tail page.

Thanks, agreed. Your wording says why the assignment has to come before
clear_compound_head(), which my comment left implicit.

Thanks,
Daejun

  parent reply	other threads:[~2026-11-05  1:06 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-04  9:59 [PATCH 0/2] mm: fix memcg_data reads during a THP split Daejun Park via B4 Relay
2026-11-04  9:59 ` [PATCH 1/2] mm/huge_memory: set memcg_data before a split page leaves the folio Daejun Park via B4 Relay
2026-11-04 16:33   ` Zi Yan
     [not found]   ` <CGME20261104163327epcas2p1f056cd220dc0d3e40e6fcea082f01b74@epcms2p6>
2026-11-05  1:06     ` Daejun Park [this message]
2026-11-04  9:59 ` [PATCH 2/2] mm/page_owner: also check PageTail before reading memcg_data Daejun Park via B4 Relay
2026-11-04 16:38   ` Zi Yan

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