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Howlett" , Andrew Morton , Vlastimil Babka , Mike Rapoport , Michal Hocko , Matthew Wilcox , Vinicius Costa Gomes Cc: iommu@lists.linux.dev, security@kernel.org, x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Dave Hansen , Lu Baolu Subject: [PATCH v7 7/8] mm: Introduce deferred freeing for kernel page tables Date: Wed, 22 Oct 2025 16:26:33 +0800 Message-ID: <20251022082635.2462433-8-baolu.lu@linux.intel.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20251022082635.2462433-1-baolu.lu@linux.intel.com> References: <20251022082635.2462433-1-baolu.lu@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Stat-Signature: j3sntwpbt1ihs4pudqa14m8jf4pbnckg X-Rspamd-Queue-Id: BA912A000D X-Rspamd-Server: rspam09 X-HE-Tag: 1761121801-856589 X-HE-Meta: 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 +huy/6vH p5HtlYOtAme3h43/OP/nQ+GJbH5IcDwOSWb6EciulEynTmY+hkx/ww8rUJdKzgx4bCw1V5KXYiLQ8++JbswgJmqLnWtgEkK5Zea2fOseUbzR/hkF2JTID27TCknvhnQsKsA3mW8rx0tCV5vKwjKEw/fY8meiY4B3Br7bQRYOLF4wiGg1Rvu7x/DqYsRlyyoW5UU68Qeg+DfpldHyb/HXWBfE1X/x21la6azjOZUGonRDC4VY= 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: Dave Hansen This introduces a conditional asynchronous mechanism, enabled by CONFIG_ASYNC_KERNEL_PGTABLE_FREE. When enabled, this mechanism defers the freeing of pages that are used as page tables for kernel address mappings. These pages are now queued to a work struct instead of being freed immediately. This deferred freeing allows for batch-freeing of page tables, providing a safe context for performing a single expensive operation (TLB flush) for a batch of kernel page tables instead of performing that expensive operation for each page table. Signed-off-by: Dave Hansen Signed-off-by: Lu Baolu Reviewed-by: Jason Gunthorpe Reviewed-by: Kevin Tian --- mm/Kconfig | 3 +++ include/linux/mm.h | 16 +++++++++++++--- mm/pgtable-generic.c | 37 +++++++++++++++++++++++++++++++++++++ 3 files changed, 53 insertions(+), 3 deletions(-) diff --git a/mm/Kconfig b/mm/Kconfig index 0e26f4fc8717..a83df9934acd 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -908,6 +908,9 @@ config PAGE_MAPCOUNT config PGTABLE_HAS_HUGE_LEAVES def_bool TRANSPARENT_HUGEPAGE || HUGETLB_PAGE +config ASYNC_KERNEL_PGTABLE_FREE + def_bool n + # TODO: Allow to be enabled without THP config ARCH_SUPPORTS_HUGE_PFNMAP def_bool n diff --git a/include/linux/mm.h b/include/linux/mm.h index 52ae551d0eb4..d521abd33164 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3031,6 +3031,14 @@ static inline void __pagetable_free(struct ptdesc *pt) __free_pages(page, compound_order(page)); } +#ifdef CONFIG_ASYNC_KERNEL_PGTABLE_FREE +void pagetable_free_kernel(struct ptdesc *pt); +#else +static inline void pagetable_free_kernel(struct ptdesc *pt) +{ + __pagetable_free(pt); +} +#endif /** * pagetable_free - Free pagetables * @pt: The page table descriptor @@ -3040,10 +3048,12 @@ static inline void __pagetable_free(struct ptdesc *pt) */ static inline void pagetable_free(struct ptdesc *pt) { - if (ptdesc_test_kernel(pt)) + if (ptdesc_test_kernel(pt)) { ptdesc_clear_kernel(pt); - - __pagetable_free(pt); + pagetable_free_kernel(pt); + } else { + __pagetable_free(pt); + } } #if defined(CONFIG_SPLIT_PTE_PTLOCKS) diff --git a/mm/pgtable-generic.c b/mm/pgtable-generic.c index 567e2d084071..1c7caa8ef164 100644 --- a/mm/pgtable-generic.c +++ b/mm/pgtable-generic.c @@ -406,3 +406,40 @@ pte_t *__pte_offset_map_lock(struct mm_struct *mm, pmd_t *pmd, pte_unmap_unlock(pte, ptl); goto again; } + +#ifdef CONFIG_ASYNC_KERNEL_PGTABLE_FREE +static void kernel_pgtable_work_func(struct work_struct *work); + +static struct { + struct list_head list; + /* protect above ptdesc lists */ + spinlock_t lock; + struct work_struct work; +} kernel_pgtable_work = { + .list = LIST_HEAD_INIT(kernel_pgtable_work.list), + .lock = __SPIN_LOCK_UNLOCKED(kernel_pgtable_work.lock), + .work = __WORK_INITIALIZER(kernel_pgtable_work.work, kernel_pgtable_work_func), +}; + +static void kernel_pgtable_work_func(struct work_struct *work) +{ + struct ptdesc *pt, *next; + LIST_HEAD(page_list); + + spin_lock(&kernel_pgtable_work.lock); + list_splice_tail_init(&kernel_pgtable_work.list, &page_list); + spin_unlock(&kernel_pgtable_work.lock); + + list_for_each_entry_safe(pt, next, &page_list, pt_list) + __pagetable_free(pt); +} + +void pagetable_free_kernel(struct ptdesc *pt) +{ + spin_lock(&kernel_pgtable_work.lock); + list_add(&pt->pt_list, &kernel_pgtable_work.list); + spin_unlock(&kernel_pgtable_work.lock); + + schedule_work(&kernel_pgtable_work.work); +} +#endif -- 2.43.0