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Shutemov" , Minchan Kim Subject: [PATCH v6 5/5] mm: factor out common parts between MADV_COLD and MADV_PAGEOUT Date: Tue, 23 Jul 2019 15:25:39 +0900 Message-Id: <20190723062539.198697-6-minchan@kernel.org> X-Mailer: git-send-email 2.22.0.657.g960e92d24f-goog In-Reply-To: <20190723062539.198697-1-minchan@kernel.org> References: <20190723062539.198697-1-minchan@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org There are many common parts between MADV_COLD and MADV_PAGEOUT. This patch factor them out to save code duplication. Suggested-by: Johannes Weiner Acked-by: Michal Hocko Signed-off-by: Minchan Kim --- mm/madvise.c | 193 ++++++++++++--------------------------------------- 1 file changed, 46 insertions(+), 147 deletions(-) diff --git a/mm/madvise.c b/mm/madvise.c index 24ded9f9e0fab..22be197c7cc9b 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -30,6 +30,11 @@ #include "internal.h" +struct madvise_walk_private { + struct mmu_gather *tlb; + bool pageout; +}; + /* * Any behaviour which results in changes to the vma->vm_flags needs to * take mmap_sem for writing. Others, which simply traverse vmas, need @@ -310,16 +315,23 @@ static long madvise_willneed(struct vm_area_struct *vma, return 0; } -static int madvise_cold_pte_range(pmd_t *pmd, unsigned long addr, - unsigned long end, struct mm_walk *walk) +static int madvise_cold_or_pageout_pte_range(pmd_t *pmd, + unsigned long addr, unsigned long end, + struct mm_walk *walk) { - struct mmu_gather *tlb = walk->private; + struct madvise_walk_private *private = walk->private; + struct mmu_gather *tlb = private->tlb; + bool pageout = private->pageout; struct mm_struct *mm = tlb->mm; struct vm_area_struct *vma = walk->vma; pte_t *orig_pte, *pte, ptent; spinlock_t *ptl; - struct page *page; unsigned long next; + struct page *page = NULL; + LIST_HEAD(page_list); + + if (fatal_signal_pending(current)) + return -EINTR; next = pmd_addr_end(addr, end); if (pmd_trans_huge(*pmd)) { @@ -366,10 +378,17 @@ static int madvise_cold_pte_range(pmd_t *pmd, unsigned long addr, tlb_remove_pmd_tlb_entry(tlb, pmd, addr); } + ClearPageReferenced(page); test_and_clear_page_young(page); - deactivate_page(page); + if (pageout) { + if (!isolate_lru_page(page)) + list_add(&page->lru, &page_list); + } else + deactivate_page(page); huge_unlock: spin_unlock(ptl); + if (pageout) + reclaim_pages(&page_list); return 0; } @@ -437,12 +456,19 @@ static int madvise_cold_pte_range(pmd_t *pmd, unsigned long addr, * As a side effect, it makes confuse idle-page tracking * because they will miss recent referenced history. */ + ClearPageReferenced(page); test_and_clear_page_young(page); - deactivate_page(page); + if (pageout) { + if (!isolate_lru_page(page)) + list_add(&page->lru, &page_list); + } else + deactivate_page(page); } arch_leave_lazy_mmu_mode(); pte_unmap_unlock(orig_pte, ptl); + if (pageout) + reclaim_pages(&page_list); cond_resched(); return 0; @@ -452,10 +478,15 @@ static void madvise_cold_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { + struct madvise_walk_private walk_private = { + .tlb = tlb, + .pageout = false, + }; + struct mm_walk cold_walk = { - .pmd_entry = madvise_cold_pte_range, + .pmd_entry = madvise_cold_or_pageout_pte_range, .mm = vma->vm_mm, - .private = tlb, + .private = &walk_private, }; tlb_start_vma(tlb, vma); @@ -482,151 +513,19 @@ static long madvise_cold(struct vm_area_struct *vma, return 0; } -static int madvise_pageout_pte_range(pmd_t *pmd, unsigned long addr, - unsigned long end, struct mm_walk *walk) -{ - struct mmu_gather *tlb = walk->private; - struct mm_struct *mm = tlb->mm; - struct vm_area_struct *vma = walk->vma; - pte_t *orig_pte, *pte, ptent; - spinlock_t *ptl; - LIST_HEAD(page_list); - struct page *page; - unsigned long next; - - if (fatal_signal_pending(current)) - return -EINTR; - - next = pmd_addr_end(addr, end); - if (pmd_trans_huge(*pmd)) { - pmd_t orig_pmd; - - tlb_change_page_size(tlb, HPAGE_PMD_SIZE); - ptl = pmd_trans_huge_lock(pmd, vma); - if (!ptl) - return 0; - - orig_pmd = *pmd; - if (is_huge_zero_pmd(orig_pmd)) - goto huge_unlock; - - if (unlikely(!pmd_present(orig_pmd))) { - VM_BUG_ON(thp_migration_supported() && - !is_pmd_migration_entry(orig_pmd)); - goto huge_unlock; - } - - page = pmd_page(orig_pmd); - if (next - addr != HPAGE_PMD_SIZE) { - int err; - - if (page_mapcount(page) != 1) - goto huge_unlock; - get_page(page); - spin_unlock(ptl); - lock_page(page); - err = split_huge_page(page); - unlock_page(page); - put_page(page); - if (!err) - goto regular_page; - return 0; - } - - if (pmd_young(orig_pmd)) { - pmdp_invalidate(vma, addr, pmd); - orig_pmd = pmd_mkold(orig_pmd); - - set_pmd_at(mm, addr, pmd, orig_pmd); - tlb_remove_tlb_entry(tlb, pmd, addr); - } - - ClearPageReferenced(page); - test_and_clear_page_young(page); - - if (!isolate_lru_page(page)) - list_add(&page->lru, &page_list); -huge_unlock: - spin_unlock(ptl); - reclaim_pages(&page_list); - return 0; - } - - if (pmd_trans_unstable(pmd)) - return 0; -regular_page: - tlb_change_page_size(tlb, PAGE_SIZE); - orig_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); - flush_tlb_batched_pending(mm); - arch_enter_lazy_mmu_mode(); - for (; addr < end; pte++, addr += PAGE_SIZE) { - ptent = *pte; - if (!pte_present(ptent)) - continue; - - page = vm_normal_page(vma, addr, ptent); - if (!page) - continue; - - /* - * creating a THP page is expensive so split it only if we - * are sure it's worth. Split it if we are only owner. - */ - if (PageTransCompound(page)) { - if (page_mapcount(page) != 1) - break; - get_page(page); - if (!trylock_page(page)) { - put_page(page); - break; - } - pte_unmap_unlock(orig_pte, ptl); - if (split_huge_page(page)) { - unlock_page(page); - put_page(page); - pte_offset_map_lock(mm, pmd, addr, &ptl); - break; - } - unlock_page(page); - put_page(page); - pte = pte_offset_map_lock(mm, pmd, addr, &ptl); - pte--; - addr -= PAGE_SIZE; - continue; - } - - VM_BUG_ON_PAGE(PageTransCompound(page), page); - - if (pte_young(ptent)) { - ptent = ptep_get_and_clear_full(mm, addr, pte, - tlb->fullmm); - ptent = pte_mkold(ptent); - set_pte_at(mm, addr, pte, ptent); - tlb_remove_tlb_entry(tlb, pte, addr); - } - ClearPageReferenced(page); - test_and_clear_page_young(page); - - if (!isolate_lru_page(page)) - list_add(&page->lru, &page_list); - } - - arch_leave_lazy_mmu_mode(); - pte_unmap_unlock(orig_pte, ptl); - reclaim_pages(&page_list); - cond_resched(); - - return 0; -} - static void madvise_pageout_page_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, unsigned long end) { + struct madvise_walk_private walk_private = { + .pageout = true, + .tlb = tlb, + }; + struct mm_walk pageout_walk = { - .pmd_entry = madvise_pageout_pte_range, + .pmd_entry = madvise_cold_or_pageout_pte_range, .mm = vma->vm_mm, - .private = tlb, + .private = &walk_private, }; tlb_start_vma(tlb, vma); -- 2.22.0.657.g960e92d24f-goog