linux-kernel - [PATCH v2 0/1] mm: Xen PV regression after THP PTE optimization

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Message-ID: <20250502215019.822-1-arkamar@atlas.cz>
Date: Fri,  2 May 2025 23:50:18 +0200
From: Petr Vaněk <arkamar@...as.cz>
To: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: David Hildenbrand <david@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ryan Roberts <ryan.roberts@....com>,
	xen-devel@...ts.xenproject.org,
	x86@...nel.org,
	stable@...r.kernel.org,
	Petr Vaněk <arkamar@...as.cz>
Subject: [PATCH v2 0/1] mm: Xen PV regression after THP PTE optimization

Hi all,

I recently discovered an mm regression introduced in kernel version 6.9
that affects systems running as a Xen PV domain [1]. Original fix
proposal wasn't ideal, but it sparked a discussion which helped us
fully understand the root cause.

The new v2 patch contains changes based on David Hildenbrand's proposal
to cap max_nr to the number of PFNs that actually remain in the folio
and to clean up the loop.

Thanks,
Petr

[1] https://lore.kernel.org/lkml/20250429142237.22138-1-arkamar@atlas.cz

Petr Vaněk (1):
  mm: fix folio_pte_batch() on XEN PV

 mm/internal.h | 27 +++++++++++----------------
 1 file changed, 11 insertions(+), 16 deletions(-)

-- 
2.48.1