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[2003:d8:2f4e:3200:c99d:a38b:3f3a:d4b3]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-427f00ba01bsm19979250f8f.41.2025.10.21.05.59.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 21 Oct 2025 05:59:33 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, Broadcom internal kernel review list , linux-doc@vger.kernel.org, virtualization@lists.linux.dev, David Hildenbrand , Andrew Morton , Oscar Salvador , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Arnd Bergmann , Greg Kroah-Hartman , Jerrin Shaji George , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Zi Yan Subject: [PATCH v1 01/23] vmw_balloon: adjust BALLOON_DEFLATE when deflating while migrating Date: Tue, 21 Oct 2025 14:59:06 +0200 Message-ID: <20251021125929.377194-2-david@redhat.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251021125929.377194-1-david@redhat.com> References: <20251021125929.377194-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When we're effectively deflating the balloon while migrating a page because inflating the new page failed, we're not adjusting BALLOON_DEFLATE. Let's do that. This is a preparation for factoring out this handling to the core code, making it work in a similar way first. As this (deflating while migrating because of inflation error) is a corner case that I don't really expect to happen in practice and the stats are not that crucial, this likely doesn't classify as a fix. Signed-off-by: David Hildenbrand Reviewed-by: SeongJae Park --- drivers/misc/vmw_balloon.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index cc1d18b3df5ca..2cc34c4968fac 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -1818,6 +1818,8 @@ static int vmballoon_migratepage(struct balloon_dev_i= nfo *b_dev_info, if (status =3D=3D VMW_BALLOON_SUCCESS) { balloon_page_insert(&b->b_dev_info, newpage); __count_vm_event(BALLOON_MIGRATE); + } else { + __count_vm_event(BALLOON_DEFLATE); } =20 /* --=20 2.51.0