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Thu, 15 May 2025 03:23:20 +0000 (UTC) Received: from h1.redhat.com (unknown [10.22.88.116]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 61E5518008F4; Thu, 15 May 2025 03:23:04 +0000 (UTC) From: Nico Pache To: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: david@redhat.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kirill.shutemov@linux.intel.com, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org Subject: [PATCH v7 02/12] introduce khugepaged_collapse_single_pmd to unify khugepaged and madvise_collapse Date: Wed, 14 May 2025 21:22:16 -0600 Message-ID: <20250515032226.128900-3-npache@redhat.com> In-Reply-To: <20250515032226.128900-1-npache@redhat.com> References: <20250515032226.128900-1-npache@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Stat-Signature: 1u6nkjgcbj9ui58zbd81my9gmyaayx7j X-Rspam-User: X-Rspamd-Queue-Id: 8C105160004 X-Rspamd-Server: rspam06 X-HE-Tag: 1747279411-452273 X-HE-Meta: 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 J1JfKrLD q2Bg2GCV9KHKvmVRspsG5g31R1lOArYWuNfIuVCQHWESrzZeVcb8gqTFn5UMmu7mc6R7KAHjqi8/qPZvFqOlJ1CakOO7RpKPT1yKKEUv6SZzJxzDB3UZL/lJxITfg9qVW/0WofZzgSqwltvKYptBgIpC9uCQvlyLH0aAmC3ZdgO2YO+qUiOBKVV5Aim4K9FtYt9dH4QOvmuw2veE1300F+z6DxL9OcZHF4HLsUQxYe9xjFQR4TEkI9j72JRowt9nDZPHJhzqG4nw6nx/8BXPVhJwT95cSNeJxaVOQR78zNLh74R51VCXn4lQuajVhhnLbRLxXxEqLQVIBloBhJdtViwD29496osW/u4nMt/0r8e10uuMw1wSrluUO8HEimxKzm+4FQEeiKK0t0eA6Rpo3tU0Z0aceRnwpij2ylF2wW2WNZmRHLt3VZKEO65lUWvq4IcUiho/hko3luVWYHA56ySPP8vYN0P7g6lSX 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: The khugepaged daemon and madvise_collapse have two different implementations that do almost the same thing. Create khugepaged_collapse_single_pmd to increase code reuse and create an entry point for future khugepaged changes. Refactor madvise_collapse and khugepaged_scan_mm_slot to use the new khugepaged_collapse_single_pmd function. Reviewed-by: Baolin Wang Signed-off-by: Nico Pache --- mm/khugepaged.c | 96 +++++++++++++++++++++++++------------------------ 1 file changed, 49 insertions(+), 47 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 806bcd8c5185..5457571d505a 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2353,6 +2353,48 @@ static int khugepaged_scan_file(struct mm_struct *mm, unsigned long addr, return result; } +/* + * Try to collapse a single PMD starting at a PMD aligned addr, and return + * the results. + */ +static int khugepaged_collapse_single_pmd(unsigned long addr, + struct vm_area_struct *vma, bool *mmap_locked, + struct collapse_control *cc) +{ + int result = SCAN_FAIL; + struct mm_struct *mm = vma->vm_mm; + + if (IS_ENABLED(CONFIG_SHMEM) && !vma_is_anonymous(vma)) { + struct file *file = get_file(vma->vm_file); + pgoff_t pgoff = linear_page_index(vma, addr); + + mmap_read_unlock(mm); + *mmap_locked = false; + result = khugepaged_scan_file(mm, addr, file, pgoff, cc); + fput(file); + if (result == SCAN_PTE_MAPPED_HUGEPAGE) { + mmap_read_lock(mm); + *mmap_locked = true; + if (khugepaged_test_exit_or_disable(mm)) { + result = SCAN_ANY_PROCESS; + goto end; + } + result = collapse_pte_mapped_thp(mm, addr, + !cc->is_khugepaged); + if (result == SCAN_PMD_MAPPED) + result = SCAN_SUCCEED; + mmap_read_unlock(mm); + *mmap_locked = false; + } + } else { + result = khugepaged_scan_pmd(mm, vma, addr, mmap_locked, cc); + } + if (cc->is_khugepaged && result == SCAN_SUCCEED) + ++khugepaged_pages_collapsed; +end: + return result; +} + static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result, struct collapse_control *cc) __releases(&khugepaged_mm_lock) @@ -2427,34 +2469,12 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result, VM_BUG_ON(khugepaged_scan.address < hstart || khugepaged_scan.address + HPAGE_PMD_SIZE > hend); - if (!vma_is_anonymous(vma)) { - struct file *file = get_file(vma->vm_file); - pgoff_t pgoff = linear_page_index(vma, - khugepaged_scan.address); - - mmap_read_unlock(mm); - mmap_locked = false; - *result = hpage_collapse_scan_file(mm, - khugepaged_scan.address, file, pgoff, cc); - fput(file); - if (*result == SCAN_PTE_MAPPED_HUGEPAGE) { - mmap_read_lock(mm); - if (hpage_collapse_test_exit_or_disable(mm)) - goto breakouterloop; - *result = collapse_pte_mapped_thp(mm, - khugepaged_scan.address, false); - if (*result == SCAN_PMD_MAPPED) - *result = SCAN_SUCCEED; - mmap_read_unlock(mm); - } - } else { - *result = hpage_collapse_scan_pmd(mm, vma, - khugepaged_scan.address, &mmap_locked, cc); - } - - if (*result == SCAN_SUCCEED) - ++khugepaged_pages_collapsed; + *result = khugepaged_collapse_single_pmd(khugepaged_scan.address, + vma, &mmap_locked, cc); + /* If we return SCAN_ANY_PROCESS we are holding the mmap_lock */ + if (*result == SCAN_ANY_PROCESS) + goto breakouterloop; /* move to next address */ khugepaged_scan.address += HPAGE_PMD_SIZE; progress += HPAGE_PMD_NR; @@ -2773,36 +2793,18 @@ int madvise_collapse(struct vm_area_struct *vma, struct vm_area_struct **prev, mmap_assert_locked(mm); memset(cc->node_load, 0, sizeof(cc->node_load)); nodes_clear(cc->alloc_nmask); - if (!vma_is_anonymous(vma)) { - struct file *file = get_file(vma->vm_file); - pgoff_t pgoff = linear_page_index(vma, addr); - mmap_read_unlock(mm); - mmap_locked = false; - result = hpage_collapse_scan_file(mm, addr, file, pgoff, - cc); - fput(file); - } else { - result = hpage_collapse_scan_pmd(mm, vma, addr, - &mmap_locked, cc); - } + result = khugepaged_collapse_single_pmd(addr, vma, &mmap_locked, cc); + if (!mmap_locked) *prev = NULL; /* Tell caller we dropped mmap_lock */ -handle_result: switch (result) { case SCAN_SUCCEED: case SCAN_PMD_MAPPED: ++thps; break; case SCAN_PTE_MAPPED_HUGEPAGE: - BUG_ON(mmap_locked); - BUG_ON(*prev); - mmap_read_lock(mm); - result = collapse_pte_mapped_thp(mm, addr, true); - mmap_read_unlock(mm); - goto handle_result; - /* Whitelisted set of results where continuing OK */ case SCAN_PMD_NULL: case SCAN_PTE_NON_PRESENT: case SCAN_PTE_UFFD_WP: -- 2.49.0