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Sun, 19 Apr 2026 18:59:50 +0000 (UTC) Received: from p1.redhat.com (unknown [10.22.74.5]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 3BDEF1956095; Sun, 19 Apr 2026 18:59:34 +0000 (UTC) From: Nico Pache To: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Cc: aarcange@redhat.com, akpm@linux-foundation.org, anshuman.khandual@arm.com, apopple@nvidia.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, byungchul@sk.com, catalin.marinas@arm.com, cl@gentwo.org, corbet@lwn.net, dave.hansen@linux.intel.com, david@kernel.org, dev.jain@arm.com, gourry@gourry.net, hannes@cmpxchg.org, hughd@google.com, jack@suse.cz, jackmanb@google.com, jannh@google.com, jglisse@google.com, joshua.hahnjy@gmail.com, kas@kernel.org, lance.yang@linux.dev, Liam.Howlett@oracle.com, ljs@kernel.org, mathieu.desnoyers@efficios.com, matthew.brost@intel.com, mhiramat@kernel.org, mhocko@suse.com, npache@redhat.com, peterx@redhat.com, pfalcato@suse.de, rakie.kim@sk.com, raquini@redhat.com, rdunlap@infradead.org, richard.weiyang@gmail.com, rientjes@google.com, rostedt@goodmis.org, rppt@kernel.org, ryan.roberts@arm.com, shivankg@amd.com, sunnanyong@huawei.com, surenb@google.com, thomas.hellstrom@linux.intel.com, tiwai@suse.de, usamaarif642@gmail.com, vbabka@suse.cz, vishal.moola@gmail.com, wangkefeng.wang@huawei.com, will@kernel.org, willy@infradead.org, yang@os.amperecomputing.com, ying.huang@linux.alibaba.com, ziy@nvidia.com, zokeefe@google.com Subject: [PATCH 7.2 v16 04/13] mm/khugepaged: generalize __collapse_huge_page_* for mTHP support Date: Sun, 19 Apr 2026 12:57:41 -0600 Message-ID: <20260419185750.260784-5-npache@redhat.com> In-Reply-To: <20260419185750.260784-1-npache@redhat.com> References: <20260419185750.260784-1-npache@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: A1DikCXFu0mEl8P7DIJSqJ5KyZbWMsrOAy4i58xIRfo_1776625191 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Server: rspam10 X-Stat-Signature: 7ixbppncj3mdzggqkrmnp4ipaxcck485 X-Rspam-User: X-Rspamd-Queue-Id: 70B8C1C000F X-HE-Tag: 1776625201-731074 X-HE-Meta: U2FsdGVkX1+3Ju3T5XzapDJ1CMS3Z1tHs+7l3b+jtqHn5l13FZrtm0VA0zAezJ8yXma91TqEtBtzzc81G614AMGd26F4c6F5dKDFF13/0Rpncz0oahu7aBcyngYQE/9XkAH9k9CxpxHwQiNwDyBpJY098TRGQwSdxNeeHJsuPSih04vMLo7ZoqoDnfYa1SyZxFSnqhGandPlEokemFZ3TmQe00wB1WVbVjSjD9/1JS5nEK6w1CyErmnDUmRK9JVcn1qUrTgyWfaj1rugQjoIRNbU1gj65rM4ddGpEZYCtOo0Rg2TDjbljB85T30nAT6HAJRFPqULEYedUvmyTIzgwdyUk453qoEXrhJVh0UL2SCbYMtwb5sqP+/ksCpQ194b7Jo1alChqglSONDhN1gzOjycsE9tg7FcA9RG+SfdfgTNesOC/dV6NkR7HwgL1z+X5eP8h9qn1nQRIHryP2hKOy+vWAmaBBAfy4zsBDB/kB4B5g5kXmZxpbhKxxRVyAbZ1oeiakp6akjudWo5Y9co/PpaKxCj5TsCYQRyitxDE/4/xZ2QtTwS9unqpAeHCIjr6gXgyz2/HgJTXDVNzzXiu+nUJtQlbGRWP7p419OtVlUItMPgPYRfJ9mQldKS9doo4CEf5oEhQ9Lp8iuWjMx8TmMn3oSU5+o8/+aXnT00axS21sxF2WXc0bOi99y5v5hfw3577e8jTLNkdhDRnRbEXqk+RX4Xjc70qOfmucQQie88q331h1eUuz0Nhz0eo/3g7+MwQAIyAQcBF+N45MBVnubNfZ/NPIHGFr4gAWwNmldE1SMRZs+sWICXOAhAz6Xr1WAFvO8M64mrb/xwAULYLuoqh5WcF8O/K4aas7AkmfJkEgek6ULWdyNN+oAY2S/GT5YF6PfftGjmf4cvTRvXpIoiVMoyfpHKDniAznf8aa0hAd1fGo5H/ax77nwzTdrvDEee5q5P9Z2Im2VVkFg XuaGuejH 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: generalize the order of the __collapse_huge_page_* and collapse_max_* functions to support future mTHP collapse. The current mechanism for determining collapse with the khugepaged_max_ptes_none value is not designed with mTHP in mind. This raises a key design issue: if we support user defined max_pte_none values (even those scaled by order), a collapse of a lower order can introduces an feedback loop, or "creep", when max_ptes_none is set to a value greater than HPAGE_PMD_NR / 2. With this configuration, a successful collapse to order N will populate enough pages to satisfy the collapse condition on order N+1 on the next scan. This leads to unnecessary work and memory churn. To fix this issue introduce a helper function that will limit mTHP collapse support to two max_ptes_none values, 0 and HPAGE_PMD_NR - 1. This effectively supports two modes: - max_ptes_none=0: never introduce new none-pages for mTHP collapse. - max_ptes_none=511 (on 4k pagesz): Always collapse to the highest available mTHP order. This removes the possiblilty of "creep", while not modifying any uAPI expectations. A warning will be emitted if any non-supported max_ptes_none value is configured with mTHP enabled. mTHP collapse will not honor the khugepaged_max_ptes_shared or khugepaged_max_ptes_swap parameters, and will fail if it encounters a shared or swapped entry. No functional changes in this patch; however it defines future behavior for mTHP collapse. Co-developed-by: Dev Jain Signed-off-by: Dev Jain Signed-off-by: Nico Pache --- mm/khugepaged.c | 124 ++++++++++++++++++++++++++++++++++-------------- 1 file changed, 88 insertions(+), 36 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index f42b55421191..283bb63854a5 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -352,51 +352,86 @@ static bool pte_none_or_zero(pte_t pte) * collapse_max_ptes_none - Calculate maximum allowed empty PTEs for collapse * @cc: The collapse control struct * @vma: The vma to check for userfaultfd + * @order: The folio order being collapsed to * * If we are not in khugepaged mode use HPAGE_PMD_NR to allow any - * empty page. + * empty page. For PMD-sized collapses (order == HPAGE_PMD_ORDER), use the + * configured khugepaged_max_ptes_none value. + * + * For mTHP collapses, we currently only support khugepaged_max_pte_none values + * of 0 or (KHUGEPAGED_MAX_PTES_LIMIT). Any other value will emit a warning and + * no mTHP collapse will be attempted * * Return: Maximum number of empty PTEs allowed for the collapse operation */ -static unsigned int collapse_max_ptes_none(struct collapse_control *cc, - struct vm_area_struct *vma) +static int collapse_max_ptes_none(struct collapse_control *cc, + struct vm_area_struct *vma, unsigned int order) { if (vma && userfaultfd_armed(vma)) return 0; if (!cc->is_khugepaged) return HPAGE_PMD_NR; - return khugepaged_max_ptes_none; + if (is_pmd_order(order)) + return khugepaged_max_ptes_none; + /* Zero/non-present collapse disabled. */ + if (!khugepaged_max_ptes_none) + return 0; + if (khugepaged_max_ptes_none == KHUGEPAGED_MAX_PTES_LIMIT) + return (1 << order) - 1; + + pr_warn_once("mTHP collapse only supports max_ptes_none values of 0 or %u\n", + KHUGEPAGED_MAX_PTES_LIMIT); + return -EINVAL; } /** * collapse_max_ptes_shared - Calculate maximum allowed shared PTEs for collapse * @cc: The collapse control struct + * @order: The folio order being collapsed to * * If we are not in khugepaged mode use HPAGE_PMD_NR to allow any * shared page. * + * For mTHP collapses, we currently dont support collapsing memory with + * shared memory. + * * Return: Maximum number of shared PTEs allowed for the collapse operation */ -static unsigned int collapse_max_ptes_shared(struct collapse_control *cc) +static unsigned int collapse_max_ptes_shared(struct collapse_control *cc, + unsigned int order) { if (!cc->is_khugepaged) return HPAGE_PMD_NR; + if (!is_pmd_order(order)) + return 0; + return khugepaged_max_ptes_shared; } /** * collapse_max_ptes_swap - Calculate maximum allowed swap PTEs for collapse * @cc: The collapse control struct + * @order: The folio order being collapsed to * * If we are not in khugepaged mode use HPAGE_PMD_NR to allow any * swap page. * + * For PMD-sized collapses (order == HPAGE_PMD_ORDER), use the configured + * khugepaged_max_ptes_swap value. + * + * For mTHP collapses, we currently dont support collapsing memory with + * swapped out memory. + * * Return: Maximum number of swap PTEs allowed for the collapse operation */ -static unsigned int collapse_max_ptes_swap(struct collapse_control *cc) +static unsigned int collapse_max_ptes_swap(struct collapse_control *cc, + unsigned int order) { if (!cc->is_khugepaged) return HPAGE_PMD_NR; + if (!is_pmd_order(order)) + return 0; + return khugepaged_max_ptes_swap; } @@ -590,18 +625,22 @@ static void release_pte_pages(pte_t *pte, pte_t *_pte, static enum scan_result __collapse_huge_page_isolate(struct vm_area_struct *vma, unsigned long start_addr, pte_t *pte, struct collapse_control *cc, - struct list_head *compound_pagelist) + unsigned int order, struct list_head *compound_pagelist) { + const unsigned long nr_pages = 1UL << order; struct page *page = NULL; struct folio *folio = NULL; unsigned long addr = start_addr; pte_t *_pte; int none_or_zero = 0, shared = 0, referenced = 0; enum scan_result result = SCAN_FAIL; - unsigned int max_ptes_none = collapse_max_ptes_none(cc, vma); - unsigned int max_ptes_shared = collapse_max_ptes_shared(cc); + int max_ptes_none = collapse_max_ptes_none(cc, vma, order); + unsigned int max_ptes_shared = collapse_max_ptes_shared(cc, order); + + if (max_ptes_none < 0) + return result; - for (_pte = pte; _pte < pte + HPAGE_PMD_NR; + for (_pte = pte; _pte < pte + nr_pages; _pte++, addr += PAGE_SIZE) { pte_t pteval = ptep_get(_pte); if (pte_none_or_zero(pteval)) { @@ -734,18 +773,18 @@ static enum scan_result __collapse_huge_page_isolate(struct vm_area_struct *vma, } static void __collapse_huge_page_copy_succeeded(pte_t *pte, - struct vm_area_struct *vma, - unsigned long address, - spinlock_t *ptl, - struct list_head *compound_pagelist) + struct vm_area_struct *vma, unsigned long address, + spinlock_t *ptl, unsigned int order, + struct list_head *compound_pagelist) { - unsigned long end = address + HPAGE_PMD_SIZE; + const unsigned long nr_pages = 1UL << order; + unsigned long end = address + (PAGE_SIZE << order); struct folio *src, *tmp; pte_t pteval; pte_t *_pte; unsigned int nr_ptes; - for (_pte = pte; _pte < pte + HPAGE_PMD_NR; _pte += nr_ptes, + for (_pte = pte; _pte < pte + nr_pages; _pte += nr_ptes, address += nr_ptes * PAGE_SIZE) { nr_ptes = 1; pteval = ptep_get(_pte); @@ -798,13 +837,11 @@ static void __collapse_huge_page_copy_succeeded(pte_t *pte, } static void __collapse_huge_page_copy_failed(pte_t *pte, - pmd_t *pmd, - pmd_t orig_pmd, - struct vm_area_struct *vma, - struct list_head *compound_pagelist) + pmd_t *pmd, pmd_t orig_pmd, struct vm_area_struct *vma, + unsigned int order, struct list_head *compound_pagelist) { + const unsigned long nr_pages = 1UL << order; spinlock_t *pmd_ptl; - /* * Re-establish the PMD to point to the original page table * entry. Restoring PMD needs to be done prior to releasing @@ -818,7 +855,7 @@ static void __collapse_huge_page_copy_failed(pte_t *pte, * Release both raw and compound pages isolated * in __collapse_huge_page_isolate. */ - release_pte_pages(pte, pte + HPAGE_PMD_NR, compound_pagelist); + release_pte_pages(pte, pte + nr_pages, compound_pagelist); } /* @@ -838,16 +875,16 @@ static void __collapse_huge_page_copy_failed(pte_t *pte, */ static enum scan_result __collapse_huge_page_copy(pte_t *pte, struct folio *folio, pmd_t *pmd, pmd_t orig_pmd, struct vm_area_struct *vma, - unsigned long address, spinlock_t *ptl, + unsigned long address, spinlock_t *ptl, unsigned int order, struct list_head *compound_pagelist) { + const unsigned long nr_pages = 1UL << order; unsigned int i; enum scan_result result = SCAN_SUCCEED; - /* * Copying pages' contents is subject to memory poison at any iteration. */ - for (i = 0; i < HPAGE_PMD_NR; i++) { + for (i = 0; i < nr_pages; i++) { pte_t pteval = ptep_get(pte + i); struct page *page = folio_page(folio, i); unsigned long src_addr = address + i * PAGE_SIZE; @@ -866,10 +903,10 @@ static enum scan_result __collapse_huge_page_copy(pte_t *pte, struct folio *foli if (likely(result == SCAN_SUCCEED)) __collapse_huge_page_copy_succeeded(pte, vma, address, ptl, - compound_pagelist); + order, compound_pagelist); else __collapse_huge_page_copy_failed(pte, pmd, orig_pmd, vma, - compound_pagelist); + order, compound_pagelist); return result; } @@ -1040,12 +1077,12 @@ static enum scan_result check_pmd_still_valid(struct mm_struct *mm, * Returns result: if not SCAN_SUCCEED, mmap_lock has been released. */ static enum scan_result __collapse_huge_page_swapin(struct mm_struct *mm, - struct vm_area_struct *vma, unsigned long start_addr, pmd_t *pmd, - int referenced) + struct vm_area_struct *vma, unsigned long start_addr, + pmd_t *pmd, int referenced, unsigned int order) { int swapped_in = 0; vm_fault_t ret = 0; - unsigned long addr, end = start_addr + (HPAGE_PMD_NR * PAGE_SIZE); + unsigned long addr, end = start_addr + (PAGE_SIZE << order); enum scan_result result; pte_t *pte = NULL; spinlock_t *ptl; @@ -1077,6 +1114,19 @@ static enum scan_result __collapse_huge_page_swapin(struct mm_struct *mm, pte_present(vmf.orig_pte)) continue; + /* + * TODO: Support swapin without leading to further mTHP + * collapses. Currently bringing in new pages via swapin may + * cause a future higher order collapse on a rescan of the same + * range. + */ + if (!is_pmd_order(order)) { + pte_unmap(pte); + mmap_read_unlock(mm); + result = SCAN_EXCEED_SWAP_PTE; + goto out; + } + vmf.pte = pte; vmf.ptl = ptl; ret = do_swap_page(&vmf); @@ -1196,7 +1246,7 @@ static enum scan_result collapse_huge_page(struct mm_struct *mm, unsigned long a * that case. Continuing to collapse causes inconsistency. */ result = __collapse_huge_page_swapin(mm, vma, address, pmd, - referenced); + referenced, HPAGE_PMD_ORDER); if (result != SCAN_SUCCEED) goto out_nolock; } @@ -1244,6 +1294,7 @@ static enum scan_result collapse_huge_page(struct mm_struct *mm, unsigned long a pte = pte_offset_map_lock(mm, &_pmd, address, &pte_ptl); if (pte) { result = __collapse_huge_page_isolate(vma, address, pte, cc, + HPAGE_PMD_ORDER, &compound_pagelist); spin_unlock(pte_ptl); } else { @@ -1274,6 +1325,7 @@ static enum scan_result collapse_huge_page(struct mm_struct *mm, unsigned long a result = __collapse_huge_page_copy(pte, folio, pmd, _pmd, vma, address, pte_ptl, + HPAGE_PMD_ORDER, &compound_pagelist); pte_unmap(pte); if (unlikely(result != SCAN_SUCCEED)) @@ -1318,9 +1370,9 @@ static enum scan_result collapse_scan_pmd(struct mm_struct *mm, unsigned long addr; spinlock_t *ptl; int node = NUMA_NO_NODE, unmapped = 0; - unsigned int max_ptes_none = collapse_max_ptes_none(cc, vma); - unsigned int max_ptes_shared = collapse_max_ptes_shared(cc); - unsigned int max_ptes_swap = collapse_max_ptes_swap(cc); + int max_ptes_none = collapse_max_ptes_none(cc, vma, HPAGE_PMD_ORDER); + unsigned int max_ptes_shared = collapse_max_ptes_shared(cc, HPAGE_PMD_ORDER); + unsigned int max_ptes_swap = collapse_max_ptes_swap(cc, HPAGE_PMD_ORDER); VM_BUG_ON(start_addr & ~HPAGE_PMD_MASK); @@ -2371,8 +2423,8 @@ static enum scan_result collapse_scan_file(struct mm_struct *mm, int present, swap; int node = NUMA_NO_NODE; enum scan_result result = SCAN_SUCCEED; - unsigned int max_ptes_none = collapse_max_ptes_none(cc, NULL); - unsigned int max_ptes_swap = collapse_max_ptes_swap(cc); + int max_ptes_none = collapse_max_ptes_none(cc, NULL, HPAGE_PMD_ORDER); + unsigned int max_ptes_swap = collapse_max_ptes_swap(cc, HPAGE_PMD_ORDER); present = 0; swap = 0; -- 2.53.0