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Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Zi Yan Subject: [PATCH v2 20/23] mm/kconfig: make BALLOON_COMPACTION depend on MIGRATION Date: Thu, 15 Jan 2026 10:20:10 +0100 Message-ID: <20260115092015.3928975-21-david@kernel.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260115092015.3928975-1-david@kernel.org> References: <20260115092015.3928975-1-david@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: f3ef45477r3jkfyijk4wqi8f5i86unuh X-Rspam-User: X-Rspamd-Queue-Id: A1F44120002 X-Rspamd-Server: rspam08 X-HE-Tag: 1768468962-365486 X-HE-Meta: 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 YYDmcjm+ dBg0uBkXWTnTb9W+QGj7tFRJBFD077NKoO2phUetG3z56rHfwanHMs/TRBo6zMB0V8Bp0Qzeg1QTL1Xg7mlMHOtxQAfCcSnpOaP7v/4jGgCHYVHGcWSk3aNXE8JamN2jfZGLO8Cr/iPRWT47wpZdvGLq3T9EA1EZQIZW8cQ3Rgfb9TK7Z9PL307CGivSIGLHua9h7YbwrqaEBrtCy3PlN7wV5tgjCuO4L+lIPWFNoZWq9M6+sBC3zMGi9PWP/760wljr27XL+COFoR2/pikibByUUJjYNrA4UkhJ5 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. 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