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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> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: gC3-Sk7F_V8hI4PpmyGFVRR38Yqqrmx9PB-2USksm3w_1761051575 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Server: rspam05 X-Stat-Signature: tp44qoue9m663rineyigk4uuzm48u63z X-Rspam-User: X-Rspamd-Queue-Id: 24DEC1C000A X-HE-Tag: 1761051577-193959 X-HE-Meta: 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 WvxtcWJ1 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 --- 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_info *b_dev_info, if (status == VMW_BALLOON_SUCCESS) { balloon_page_insert(&b->b_dev_info, newpage); __count_vm_event(BALLOON_MIGRATE); + } else { + __count_vm_event(BALLOON_DEFLATE); } /* -- 2.51.0