linux-kernel - [PATCH v2 55/70] mm/ksm: Use maple tree iterators instead of vma linked list

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Date:   Tue, 12 Jan 2021 11:12:25 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...gle.com>, Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jerome Glisse <jglisse@...hat.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>
Subject: [PATCH v2 55/70] mm/ksm: Use maple tree iterators instead of vma linked list

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/ksm.c | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/mm/ksm.c b/mm/ksm.c
index 0960750bb316d..9aa579cef7614 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -975,10 +975,12 @@ static int unmerge_and_remove_all_rmap_items(void)
 	spin_unlock(&ksm_mmlist_lock);
 
 	for (mm_slot = ksm_scan.mm_slot;
-			mm_slot != &ksm_mm_head; mm_slot = ksm_scan.mm_slot) {
-		mm = mm_slot->mm;
+			mm_slot != &ksm_mm_head; mm_slot = ksm_scan.mm_slot, mm = mm_slot->mm) {
+		MA_STATE(mas, &mm->mm_mt, 0, 0);
+
 		mmap_read_lock(mm);
-		for (vma = mm->mmap; vma; vma = vma->vm_next) {
+		mas_set(&mas, 0);
+		mas_for_each(&mas, vma, ULONG_MAX) {
 			if (ksm_test_exit(mm))
 				break;
 			if (!(vma->vm_flags & VM_MERGEABLE) || !vma->anon_vma)
@@ -2286,13 +2288,14 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
 	}
 
 	mm = slot->mm;
+	MA_STATE(mas, &mm->mm_mt, 0, 0);
+
 	mmap_read_lock(mm);
 	if (ksm_test_exit(mm))
-		vma = NULL;
-	else
-		vma = find_vma(mm, ksm_scan.address);
+		goto no_vmas;
 
-	for (; vma; vma = vma->vm_next) {
+	mas_set(&mas, ksm_scan.address);
+	mas_for_each(&mas, vma, ULONG_MAX) {
 		if (!(vma->vm_flags & VM_MERGEABLE))
 			continue;
 		if (ksm_scan.address < vma->vm_start)
@@ -2330,6 +2333,7 @@ static struct rmap_item *scan_get_next_rmap_item(struct page **page)
 	}
 
 	if (ksm_test_exit(mm)) {
+no_vmas:
 		ksm_scan.address = 0;
 		ksm_scan.rmap_list = &slot->rmap_list;
 	}
-- 
2.28.0