linux-kernel - [PATCH v3 49/66] mm/khugepaged: Use maple tree iterators instead of vma linked list

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Date:   Tue, 5 Oct 2021 01:31:05 +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>,
        David Hildenbrand <david@...hat.com>,
        Douglas Gilbert <dgilbert@...erlog.com>
CC:     Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        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 v3 49/66] mm/khugepaged: Use maple tree iterators instead of
 vma linked list

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/huge_memory.c | 4 ++--
 mm/khugepaged.c  | 9 ++++++---
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 5e9ef0fc261e..8595111ca0cc 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2270,11 +2270,11 @@ void vma_adjust_trans_huge(struct vm_area_struct *vma,
 	split_huge_pmd_if_needed(vma, end);
 
 	/*
-	 * If we're also updating the vma->vm_next->vm_start,
+	 * If we're also updating the vma_next(vma)->vm_start,
 	 * check if we need to split it.
 	 */
 	if (adjust_next > 0) {
-		struct vm_area_struct *next = vma->vm_next;
+		struct vm_area_struct *next = vma_next(vma->vm_mm, vma);
 		unsigned long nstart = next->vm_start;
 		nstart += adjust_next;
 		split_huge_pmd_if_needed(next, nstart);
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index f27673c596d2..c1ee32fc0d2e 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2075,6 +2075,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
 	struct mm_struct *mm;
 	struct vm_area_struct *vma;
 	int progress = 0;
+	unsigned long address;
 
 	VM_BUG_ON(!pages);
 	lockdep_assert_held(&khugepaged_mm_lock);
@@ -2098,11 +2099,13 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
 	vma = NULL;
 	if (unlikely(!mmap_read_trylock(mm)))
 		goto breakouterloop_mmap_lock;
-	if (likely(!khugepaged_test_exit(mm)))
-		vma = find_vma(mm, khugepaged_scan.address);
 
 	progress++;
-	for (; vma; vma = vma->vm_next) {
+	if (unlikely(khugepaged_test_exit(mm)))
+		goto breakouterloop_mmap_lock;
+
+	address = khugepaged_scan.address;
+	mt_for_each(&mm->mm_mt, vma, address, ULONG_MAX) {
 		unsigned long hstart, hend;
 
 		cond_resched();
-- 
2.30.2