From 8b1f0fdf7b8668b37943a616ad41779e814a9cf1 Mon Sep 17 00:00:00 2001 From: "Liam R. Howlett" Date: Mon, 4 Jan 2021 14:54:07 -0500 Subject: [PATCH] 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 --- kernel/sched/fair.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6e476f6d9435..39bb4a6c8507 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; -- 2.50.1