linux-kernel - [PATCH 72/94] kernel/sched/fair: Use maple tree iterators instead of linked list

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Date:   Wed, 28 Apr 2021 15:36:23 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Laurent Dufour <ldufour@...ux.ibm.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Michel Lespinasse <walken.cr@...il.com>,
        Liam Howlett <liam.howlett@...cle.com>
Subject: [PATCH 72/94] kernel/sched/fair: Use maple tree iterators instead of
 linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 kernel/sched/fair.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9b8ae02f1994..db403de2131e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2726,6 +2726,7 @@ static void task_numa_work(struct callback_head *work)
 	unsigned long start, end;
 	unsigned long nr_pte_updates = 0;
 	long pages, virtpages;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
 
 	SCHED_WARN_ON(p != container_of(work, struct task_struct, numa_work));
 
@@ -2778,13 +2779,17 @@ static void task_numa_work(struct callback_head *work)
 
 	if (!mmap_read_trylock(mm))
 		return;
-	vma = find_vma(mm, start);
+
+	rcu_read_lock();
+	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);
 	}
-	for (; vma; vma = vma->vm_next) {
+
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
 			is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) {
 			continue;
@@ -2829,7 +2834,9 @@ static void task_numa_work(struct callback_head *work)
 			if (pages <= 0 || virtpages <= 0)
 				goto out;
 
+			rcu_read_unlock();
 			cond_resched();
+			rcu_read_lock();
 		} while (end != vma->vm_end);
 	}
 
@@ -2844,6 +2851,7 @@ static void task_numa_work(struct callback_head *work)
 		mm->numa_scan_offset = start;
 	else
 		reset_ptenuma_scan(p);
+	rcu_read_unlock();
 	mmap_read_unlock(mm);
 
 	/*
-- 
2.30.2