linux-kernel - [PATCH v3 09/22] sched/numa: do not scan msharefs vmas

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Message-ID: <20250820010415.699353-10-anthony.yznaga@oracle.com>
Date: Tue, 19 Aug 2025 18:04:02 -0700
From: Anthony Yznaga <anthony.yznaga@...cle.com>
To: linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, andreyknvl@...il.com, arnd@...db.de,
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Subject: [PATCH v3 09/22] sched/numa: do not scan msharefs vmas

Scanning an msharefs vma results in changes to the shared page
table but with TLB flushes incorrectly only going to the process
with the vma.

Signed-off-by: Anthony Yznaga <anthony.yznaga@...cle.com>
---
 kernel/sched/fair.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e256793b9a08..6f28395991cd 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3379,7 +3379,8 @@ static void task_numa_work(struct callback_head *work)
 
 	for (; vma; vma = vma_next(&vmi)) {
 		if (!vma_migratable(vma) || !vma_policy_mof(vma) ||
-			is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP)) {
+			is_vm_hugetlb_page(vma) || (vma->vm_flags & VM_MIXEDMAP) ||
+			vma_is_mshare(vma)) {
 			trace_sched_skip_vma_numa(mm, vma, NUMAB_SKIP_UNSUITABLE);
 			continue;
 		}
-- 
2.47.1