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Mon, 2 Feb 2026 17:57:32 +0300 From: To: , , , , , , , , , , Subject: [RFC PATCH v1 2/4] mm/damon: Support for synchrounous huge pages collapse Date: Mon, 2 Feb 2026 14:56:47 +0000 Message-ID: <20260202145650.1795854-3-gutierrez.asier@huawei-partners.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260202145650.1795854-1-gutierrez.asier@huawei-partners.com> References: <20260202145650.1795854-1-gutierrez.asier@huawei-partners.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.123.65.218] X-ClientProxiedBy: mscpeml100003.china.huawei.com (10.199.174.67) To mscpeml500003.china.huawei.com (7.188.49.51) X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 6833B1C0003 X-Stat-Signature: krwzbwoq9z4n8hckpq1dyqftdufeyd33 X-Rspam-User: X-HE-Tag: 1770044254-655346 X-HE-Meta: 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 NpMJYAU9 1976LMEb5FpuUpQJSUB8MnCinBEhMjnIKVrLoTojJ8ldEuOzzOeql0GTYvYh3l+daB4ZJnNAOHD2lH67ewazPJd+BVXQMvK7gRhAzeevjJvZGodVDe6vRruyGd+UxGn8w2xQMHIOX7O1wWOhdKjpdgI2GUl/CJfmtDAzNvVoJRei9lPUkUtFkugFnLwZAws7cPdOFnnIrKVrr/xYzZuc+j6LdsMpUTq/B0SEI7o02vvYHLM2dnGyB1kClAYdJ1ASJbe50 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: From: Asier Gutierrez * Support for huge pages collapse, which will be used by dynamic_hugepages module. * Include the new module for compilation Signed-off-by: Asier Gutierrez Co-developed-by: Anatoly Stepanov --- include/linux/damon.h | 1 + mm/damon/Kconfig | 7 +++++++ mm/damon/Makefile | 1 + mm/damon/vaddr.c | 3 +++ 4 files changed, 12 insertions(+) diff --git a/include/linux/damon.h b/include/linux/damon.h index 3813373a9200..de5a994f92c2 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -142,6 +142,7 @@ enum damos_action { DAMOS_LRU_DEPRIO, DAMOS_MIGRATE_HOT, DAMOS_MIGRATE_COLD, + DAMOS_COLLAPSE, DAMOS_STAT, /* Do nothing but only record the stat */ NR_DAMOS_ACTIONS, }; diff --git a/mm/damon/Kconfig b/mm/damon/Kconfig index 8c868f7035fc..2355aacb6d12 100644 --- a/mm/damon/Kconfig +++ b/mm/damon/Kconfig @@ -110,4 +110,11 @@ config DAMON_STAT_ENABLED_DEFAULT Whether to enable DAMON_STAT by default. Users can disable it in boot or runtime using its 'enabled' parameter. +config DAMON_HOT_HUGEPAGE + bool "Build DAMON-based collapse of hot regions (DAMON_HOT_HUGEPAGES)" + depends on DAMON_VADDR + help + Collapse hot region into huge pages. Hot regions are determined by + DAMON-based sampling + endmenu diff --git a/mm/damon/Makefile b/mm/damon/Makefile index d8d6bf5f8bff..998bddc17819 100644 --- a/mm/damon/Makefile +++ b/mm/damon/Makefile @@ -7,3 +7,4 @@ obj-$(CONFIG_DAMON_SYSFS) += sysfs-common.o sysfs-schemes.o sysfs.o obj-$(CONFIG_DAMON_RECLAIM) += modules-common.o reclaim.o obj-$(CONFIG_DAMON_LRU_SORT) += modules-common.o lru_sort.o obj-$(CONFIG_DAMON_STAT) += modules-common.o stat.o +obj-$(CONFIG_DAMON_HOT_HUGEPAGE) += modules-common.o dynamic_hugepages.o diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index 23ed738a0bd6..4acbc1a6a5be 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -970,6 +970,9 @@ static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx, case DAMOS_NOHUGEPAGE: madv_action = MADV_NOHUGEPAGE; break; + case DAMOS_COLLAPSE: + madv_action = MADV_COLLAPSE; + break; case DAMOS_MIGRATE_HOT: case DAMOS_MIGRATE_COLD: return damos_va_migrate(t, r, scheme, sz_filter_passed); -- 2.43.0