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McKenney" , Matthew Wilcox , David Rientjes , Axel Rasmussen , Suren Baghdasaryan , Vlastimil Babka , Rik van Riel , Peter Zijlstra Subject: [PATCH v3 44/66] kernel/sched/fair: Use maple tree iterators instead of linked list Thread-Topic: [PATCH v3 44/66] kernel/sched/fair: Use maple tree iterators instead of linked list Thread-Index: AQHXuYiorXUzL4zFkUaYahbdRC7KyA== Date: Tue, 5 Oct 2021 01:31:03 +0000 Message-ID: <20211005012959.1110504-45-Liam.Howlett@oracle.com> References: <20211005012959.1110504-1-Liam.Howlett@oracle.com> In-Reply-To: <20211005012959.1110504-1-Liam.Howlett@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.30.2 authentication-results: lists.infradead.org; dkim=none (message not signed) header.d=none;lists.infradead.org; dmarc=none action=none header.from=oracle.com; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 8ee5a201-36cf-43ed-6466-08d9879fd78b x-ms-traffictypediagnostic: BLAPR10MB5044: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:655; 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Howlett" Signed-off-by: Liam R. Howlett --- 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 ff69f245b939..46769907c363 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -2720,6 +2720,7 @@ static void task_numa_work(struct callback_head *work= ) unsigned long start, end; unsigned long nr_pte_updates =3D 0; long pages, virtpages; + MA_STATE(mas, &mm->mm_mt, 0, 0); =20 SCHED_WARN_ON(p !=3D container_of(work, struct task_struct, numa_work)); =20 @@ -2772,13 +2773,17 @@ static void task_numa_work(struct callback_head *wo= rk) =20 if (!mmap_read_trylock(mm)) return; - vma =3D find_vma(mm, start); + + rcu_read_lock(); + mas_set(&mas, start); + vma =3D mas_find(&mas, ULONG_MAX); if (!vma) { reset_ptenuma_scan(p); start =3D 0; - vma =3D mm->mmap; + mas_set(&mas, start); } - for (; vma; vma =3D 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; @@ -2823,7 +2828,9 @@ static void task_numa_work(struct callback_head *work= ) if (pages <=3D 0 || virtpages <=3D 0) goto out; =20 + rcu_read_unlock(); cond_resched(); + rcu_read_lock(); } while (end !=3D vma->vm_end); } =20 @@ -2838,6 +2845,7 @@ static void task_numa_work(struct callback_head *work= ) mm->numa_scan_offset =3D start; else reset_ptenuma_scan(p); + rcu_read_unlock(); mmap_read_unlock(mm); =20 /* --=20 2.30.2