From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1E00C219FC for ; Tue, 30 Dec 2025 18:16:29 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767118590; cv=none; b=asHK2KPGwcciVtE/5S6uBW8LHzi00laf8iDpt3orM4XfV4LCyoBm5eeja+6/0+u5DCFSVIk5ZK3UEa+orvE98mVb9+iS5EUK8RLRg85KcKuO0zFaYEvfMfwQcvpm88ZVPFQV9E5oKQM0du6xuteAkz7XR4EhcBb0Yg4+rFw7PC4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767118590; c=relaxed/simple; bh=x1Ys5kG6A/qPiFrk9FIRK0XMiow6OnIQfAod33trty4=; h=Date:To:From:Subject:Message-Id; b=Iqzdlm5JTDgp2FkuuNDsOtmmQworXSubHighq4GCZeundN+EShAnyTtlZcQnH1MZaMHyex+MwnwTyDAwn3oWviLPJrdYuft7mzLi20neIeDJKh3ZCoEc79w6P4tkf1OIGBFOKIPJak1Jpb6997922HyOfjM+/DPWGmySIaIcboE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=bajtcUuX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="bajtcUuX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 92F5DC116D0; Tue, 30 Dec 2025 18:16:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1767118589; bh=x1Ys5kG6A/qPiFrk9FIRK0XMiow6OnIQfAod33trty4=; h=Date:To:From:Subject:From; b=bajtcUuXxS80UqFSzdksMByKqt4qb5jzlSuBpONvh0ig4meFkHOzAMePgryQsgjjv EVDwgo5mV7kIEjm0ZTAERAZM1fzz1MrBCWmuHf7k81StGo3dB27nHgAxlPzjJWEKTJ yrhFPmGcdYRd5eb065dVKQppEHevB4EyiCaTUK6M= Date: Tue, 30 Dec 2025 10:16:28 -0800 To: mm-commits@vger.kernel.org,ziy@nvidia.com,willy@infradead.org,vbabka@suse.cz,sidhartha.kumar@oracle.com,osalvador@suse.de,muchun.song@linux.dev,jane.chu@oracle.com,jackmanb@google.com,hannes@cmpxchg.org,david@redhat.com,wangkefeng.wang@huawei.com,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation.patch added to mm-new branch Message-Id: <20251230181629.92F5DC116D0@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm: hugetlb: allocate frozen pages for gigantic allocation has been added to the -mm mm-new branch. Its filename is mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: Kefeng Wang Subject: mm: hugetlb: allocate frozen pages for gigantic allocation Date: Tue, 30 Dec 2025 15:24:22 +0800 The alloc_gigantic_folio() allocates a folio with refcount increated and then freeze it, convert to allocate a frozen folio to remove the atomic operation about folio refcount, and saving atomic operation during __update_and_free_hugetlb_folio() too. Besides, rename hugetlb_cma_{alloc,free}_folio(), alloc_gigantic_folio() and alloc_buddy_hugetlb_folio() with frozen which make them more self-explanatory. Link: https://lkml.kernel.org/r/20251230072422.265265-7-wangkefeng.wang@huawei.com Signed-off-by: Kefeng Wang Cc: Brendan Jackman Cc: David Hildenbrand Cc: Jane Chu Cc: Johannes Weiner Cc: Matthew Wilcox (Oracle) Cc: Muchun Song Cc: Oscar Salvador Cc: Sidhartha Kumar Cc: Vlastimil Babka Cc: Zi Yan Signed-off-by: Andrew Morton --- mm/hugetlb.c | 75 ++++++++++++--------------------------------- mm/hugetlb_cma.c | 9 +---- mm/hugetlb_cma.h | 10 +++--- 3 files changed, 28 insertions(+), 66 deletions(-) --- a/mm/hugetlb.c~mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation +++ a/mm/hugetlb.c @@ -121,16 +121,6 @@ static void hugetlb_unshare_pmds(struct unsigned long start, unsigned long end, bool take_locks); static struct resv_map *vma_resv_map(struct vm_area_struct *vma); -static void hugetlb_free_folio(struct folio *folio) -{ - if (folio_test_hugetlb_cma(folio)) { - hugetlb_cma_free_folio(folio); - return; - } - - folio_put(folio); -} - static inline bool subpool_is_free(struct hugepage_subpool *spool) { if (spool->count) @@ -1417,52 +1407,25 @@ err: return NULL; } -#ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE -#ifdef CONFIG_CONTIG_ALLOC -static struct folio *alloc_gigantic_folio(int order, gfp_t gfp_mask, +#if defined(CONFIG_ARCH_HAS_GIGANTIC_PAGE) && defined(CONFIG_CONTIG_ALLOC) +static struct folio *alloc_gigantic_frozen_folio(int order, gfp_t gfp_mask, int nid, nodemask_t *nodemask) { struct folio *folio; - bool retried = false; - -retry: - folio = hugetlb_cma_alloc_folio(order, gfp_mask, nid, nodemask); - if (!folio) { - struct page *page; - - if (hugetlb_cma_exclusive_alloc()) - return NULL; - - page = alloc_contig_frozen_pages(1 << order, gfp_mask, nid, nodemask); - if (!page) - return NULL; - set_page_refcounted(page); - folio = page_folio(page); - } - - if (folio_ref_freeze(folio, 1)) + folio = hugetlb_cma_alloc_frozen_folio(order, gfp_mask, nid, nodemask); + if (folio) return folio; - pr_warn("HugeTLB: unexpected refcount on PFN %lu\n", folio_pfn(folio)); - hugetlb_free_folio(folio); - if (!retried) { - retried = true; - goto retry; - } - return NULL; -} + if (hugetlb_cma_exclusive_alloc()) + return NULL; -#else /* !CONFIG_CONTIG_ALLOC */ -static struct folio *alloc_gigantic_folio(int order, gfp_t gfp_mask, int nid, - nodemask_t *nodemask) -{ - return NULL; + folio = (struct folio *)alloc_contig_frozen_pages(1 << order, gfp_mask, + nid, nodemask); + return folio; } -#endif /* CONFIG_CONTIG_ALLOC */ - -#else /* !CONFIG_ARCH_HAS_GIGANTIC_PAGE */ -static struct folio *alloc_gigantic_folio(int order, gfp_t gfp_mask, int nid, +#else /* !CONFIG_ARCH_HAS_GIGANTIC_PAGE || !CONFIG_CONTIG_ALLOC */ +static struct folio *alloc_gigantic_frozen_folio(int order, gfp_t gfp_mask, int nid, nodemask_t *nodemask) { return NULL; @@ -1592,9 +1555,11 @@ static void __update_and_free_hugetlb_fo if (unlikely(folio_test_hwpoison(folio))) folio_clear_hugetlb_hwpoison(folio); - folio_ref_unfreeze(folio, 1); - - hugetlb_free_folio(folio); + VM_BUG_ON_FOLIO(folio_ref_count(folio), folio); + if (folio_test_hugetlb_cma(folio)) + hugetlb_cma_free_frozen_folio(folio); + else + free_frozen_pages(&folio->page, folio_order(folio)); } /* @@ -1874,7 +1839,7 @@ struct address_space *hugetlb_folio_mapp return NULL; } -static struct folio *alloc_buddy_hugetlb_folio(int order, gfp_t gfp_mask, +static struct folio *alloc_buddy_frozen_folio(int order, gfp_t gfp_mask, int nid, nodemask_t *nmask, nodemask_t *node_alloc_noretry) { struct folio *folio; @@ -1930,10 +1895,10 @@ static struct folio *only_alloc_fresh_hu nid = numa_mem_id(); if (order_is_gigantic(order)) - folio = alloc_gigantic_folio(order, gfp_mask, nid, nmask); + folio = alloc_gigantic_frozen_folio(order, gfp_mask, nid, nmask); else - folio = alloc_buddy_hugetlb_folio(order, gfp_mask, nid, nmask, - node_alloc_noretry); + folio = alloc_buddy_frozen_folio(order, gfp_mask, nid, nmask, + node_alloc_noretry); if (folio) init_new_hugetlb_folio(folio); return folio; --- a/mm/hugetlb_cma.c~mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation +++ a/mm/hugetlb_cma.c @@ -18,16 +18,14 @@ static unsigned long hugetlb_cma_size_in static bool hugetlb_cma_only; static unsigned long hugetlb_cma_size __initdata; -void hugetlb_cma_free_folio(struct folio *folio) +void hugetlb_cma_free_frozen_folio(struct folio *folio) { - folio_ref_dec(folio); - WARN_ON_ONCE(!cma_release_frozen(hugetlb_cma[folio_nid(folio)], &folio->page, folio_nr_pages(folio))); } -struct folio *hugetlb_cma_alloc_folio(int order, gfp_t gfp_mask, - int nid, nodemask_t *nodemask) +struct folio *hugetlb_cma_alloc_frozen_folio(int order, gfp_t gfp_mask, + int nid, nodemask_t *nodemask) { int node; struct folio *folio; @@ -50,7 +48,6 @@ struct folio *hugetlb_cma_alloc_folio(in if (!page) return NULL; - set_page_refcounted(page); folio = page_folio(page); folio_set_hugetlb_cma(folio); return folio; --- a/mm/hugetlb_cma.h~mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation +++ a/mm/hugetlb_cma.h @@ -3,8 +3,8 @@ #define _LINUX_HUGETLB_CMA_H #ifdef CONFIG_CMA -void hugetlb_cma_free_folio(struct folio *folio); -struct folio *hugetlb_cma_alloc_folio(int order, gfp_t gfp_mask, +void hugetlb_cma_free_frozen_folio(struct folio *folio); +struct folio *hugetlb_cma_alloc_frozen_folio(int order, gfp_t gfp_mask, int nid, nodemask_t *nodemask); struct huge_bootmem_page *hugetlb_cma_alloc_bootmem(struct hstate *h, int *nid, bool node_exact); @@ -14,12 +14,12 @@ unsigned long hugetlb_cma_total_size(voi void hugetlb_cma_validate_params(void); bool hugetlb_early_cma(struct hstate *h); #else -static inline void hugetlb_cma_free_folio(struct folio *folio) +static inline void hugetlb_cma_free_frozen_folio(struct folio *folio) { } -static inline struct folio *hugetlb_cma_alloc_folio(int order, gfp_t gfp_mask, - int nid, nodemask_t *nodemask) +static inline struct folio *hugetlb_cma_alloc_frozen_folio(int order, + gfp_t gfp_mask, int nid, nodemask_t *nodemask) { return NULL; } _ Patches currently in -mm which might be from wangkefeng.wang@huawei.com are mm-debug_vm_pgtable-add-debug_vm_pgtable_free_huge_page.patch mm-page_alloc-add-__split_page.patch mm-cma-kill-cma_pages_valid.patch mm-page_alloc-add-alloc_contig_frozen_rangepages.patch mm-cma-add-cma_alloc_frozen_compound.patch mm-hugetlb-allocate-frozen-pages-for-gigantic-allocation.patch