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Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Zi Yan Subject: [PATCH v3 21/24] mm/kconfig: make BALLOON_COMPACTION depend on MIGRATION Date: Tue, 20 Jan 2026 00:01:29 +0100 Message-ID: <20260119230133.3551867-22-david@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260119230133.3551867-1-david@kernel.org> References: <20260119230133.3551867-1-david@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 91um9rstkhjrxunq487pdfzfjr3ywyif X-Rspamd-Queue-Id: 0EC46100003 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1768863848-61868 X-HE-Meta: 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 CdPH9bML NZTEX4uGtqen8g1jKUBmdGQfztHLDbKcHoHONhAdsoVedtwyxqquIs4ZTcviQyO0qYSLa0rdcLS5y8rggvCmFQRZ1tOYQFIUZhk1D1HpEJfMol4xJN88lgbsUHj+bRu4FfyV8VoUwf2V+BvswGnulMHNT5FeXF/dX4FrZGFJM5gy65WNCoZk9jKIgv00r3/lXGbMMVR/YRAz714CSFcfqgm3JKAaJYWMVf6coln6SIkJSh/XRwra0wguMUT+HODLhqpIdatQjPXxwj2mBvwyoUMHBu0jgZy/tTMKIoWGiCjHC5POuGmOKda78oq+WNaN3FuV96vNwyw8jfKs= 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: Migration support for balloon memory depends on MIGRATION not COMPACTION. Compaction is simply another user of page migration. The last dependency on compaction.c was effectively removed with commit 3d388584d599 ("mm: convert "movable" flag in page->mapping to a page flag"). Ever since, everything for handling movable_ops page migration resides in core migration code. So let's change the dependency and adjust the description + help text. We'll rename BALLOON_COMPACTION separately next. Reviewed-by: Lorenzo Stoakes Acked-by: Michael S. Tsirkin Signed-off-by: David Hildenbrand (Red Hat) --- mm/Kconfig | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/mm/Kconfig b/mm/Kconfig index 24a3ff149a1b0..0d13c1b36e1c1 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -599,17 +599,14 @@ config MEMORY_BALLOON # # support for memory balloon compaction config BALLOON_COMPACTION - bool "Allow for balloon memory compaction/migration" + bool "Allow for balloon memory migration" default y - depends on COMPACTION && MEMORY_BALLOON - help - Memory fragmentation introduced by ballooning might reduce - significantly the number of 2MB contiguous memory blocks that can be - used within a guest, thus imposing performance penalties associated - with the reduced number of transparent huge pages that could be used - by the guest workload. Allowing the compaction & migration for memory - pages enlisted as being part of memory balloon devices avoids the - scenario aforementioned and helps improving memory defragmentation. + depends on MIGRATION && MEMORY_BALLOON + help + Allow for migration of pages inflated in a memory balloon such that + they can be allocated from memory areas only available for movable + allocations (e.g., ZONE_MOVABLE, CMA) and such that they can be + migrated for memory defragmentation purposes by memory compaction. # # support for memory compaction -- 2.52.0