From: Liam R. Howlett Date: Mon, 4 Jan 2021 19:54:07 +0000 (-0500) Subject: sched: Use maple tree iterator to walk VMAs X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=8b1f0fdf7b8668b37943a616ad41779e814a9cf1;p=users%2Fjedix%2Flinux-maple.git sched: Use maple tree iterator to walk VMAs The linked list is slower than walking the VMAs using the maple tree. We can't use the VMA iterator here because it doesn't support moving to an earlier position. Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Liam R. Howlett --- diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6e476f6d94351..39bb4a6c8507b 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2672,6 +2672,7 @@ static void task_numa_work(struct callback_head *work) struct task_struct *p = current; struct mm_struct *mm = p->mm; u64 runtime = p->se.sum_exec_runtime; + MA_STATE(mas, &mm->mm_mt, 0, 0); struct vm_area_struct *vma; unsigned long start, end; unsigned long nr_pte_updates = 0; @@ -2728,13 +2729,16 @@ static void task_numa_work(struct callback_head *work) if (!mmap_read_trylock(mm)) return; - vma = find_vma(mm, start); + mas_set(&mas, start); + vma = mas_find(&mas, ULONG_MAX); if (!vma) { reset_ptenuma_scan(p); start = 0; - vma = mm->mmap; + mas_set(&mas, start); + vma = mas_find(&mas, ULONG_MAX); } - for (; vma; vma = vma->vm_next) { + + for (; vma; vma = mas_find(&mas, ULONG_MAX)) { if (!vma_migratable(vma) || !vma_policy_mof(vma) || is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) { continue;