From: Fiona Ebner <f.ebner@proxmox.com>
To: pve-devel@lists.proxmox.com
Subject: [pve-devel] [PATCH docs v2 3/3] kernel samepage merging: describe how to disable for a specific VM
Date: Thu, 13 Nov 2025 16:51:09 +0100 [thread overview]
Message-ID: <20251113155127.591195-4-f.ebner@proxmox.com> (raw)
In-Reply-To: <20251113155127.591195-1-f.ebner@proxmox.com>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
---
kernel-samepage-merging.adoc | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/kernel-samepage-merging.adoc b/kernel-samepage-merging.adoc
index 5f55403..e2e70d7 100644
--- a/kernel-samepage-merging.adoc
+++ b/kernel-samepage-merging.adoc
@@ -34,7 +34,11 @@ be a legal requirement.
Disabling KSM
~~~~~~~~~~~~~
-To see if KSM is active, you can check the output of:
+KSM can be disabled on a node or on a per-VM basis.
+
+.Disabe KSM on a Node
+
+To see if KSM is active on a node, you can check the output of:
----
# systemctl status ksmtuned
@@ -52,3 +56,11 @@ Finally, to unmerge all the currently merged pages, run:
# echo 2 > /sys/kernel/mm/ksm/run
----
+.Disabe KSM for a Specific VM
+
+The `allow-ksm` VM configuration option controls whether memory page merging is
+allowed for a given VM. The option defaults to true and can be disabled with:
+
+----
+# qm set <vmid> --allow-ksm 0
+----
--
2.47.3
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next prev parent reply other threads:[~2025-11-13 15:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-13 15:51 [pve-devel] [PATCH-SERIES qemu-server/manager/docs v2 0/3] close #5291: support disabling KSM for specific VMs Fiona Ebner
2025-11-13 15:51 ` [pve-devel] [PATCH qemu-server v2 1/3] " Fiona Ebner
2025-11-13 15:51 ` [pve-devel] [PATCH manager v2 2/3] close #5291: ui: qemu: memory edit: " Fiona Ebner
2025-11-14 21:02 ` [pve-devel] applied: " Thomas Lamprecht
2025-11-13 15:51 ` Fiona Ebner [this message]
2025-11-14 21:08 ` [pve-devel] applied: [PATCH docs v2 3/3] kernel samepage merging: describe how to disable for a specific VM Thomas Lamprecht
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