linux-kernel - [tip: x86/cache] Documentation/x86: Documentation for MON group move feature

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Message-ID: <168613512697.404.616009463445838312.tip-bot2@tip-bot2>
Date:   Wed, 07 Jun 2023 10:52:06 -0000
From:   "tip-bot2 for Peter Newman" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Peter Newman <peternewman@...gle.com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Babu Moger <babu.moger@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/cache] Documentation/x86: Documentation for MON group move feature

The following commit has been merged into the x86/cache branch of tip:

Commit-ID:     e0a6ede2dd884adb73a7dde80444185b655f7c79
Gitweb:        https://git.kernel.org/tip/e0a6ede2dd884adb73a7dde80444185b655f7c79
Author:        Peter Newman <peternewman@...gle.com>
AuthorDate:    Wed, 19 Apr 2023 14:50:15 +02:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Wed, 07 Jun 2023 12:42:12 +02:00

Documentation/x86: Documentation for MON group move feature

Describe new support for moving MON groups to a new parent CTRL_MON
group and its restrictions.

Signed-off-by: Peter Newman <peternewman@...gle.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@...el.com>
Tested-by: Babu Moger <babu.moger@....com>
Link: https://lore.kernel.org/r/20230419125015.693566-4-peternewman@google.com
---
 Documentation/arch/x86/resctrl.rst | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/arch/x86/resctrl.rst b/Documentation/arch/x86/resctrl.rst
index 387ccbc..cb05d90 100644
--- a/Documentation/arch/x86/resctrl.rst
+++ b/Documentation/arch/x86/resctrl.rst
@@ -287,6 +287,13 @@ Removing a directory will move all tasks and cpus owned by the group it
 represents to the parent. Removing one of the created CTRL_MON groups
 will automatically remove all MON groups below it.
 
+Moving MON group directories to a new parent CTRL_MON group is supported
+for the purpose of changing the resource allocations of a MON group
+without impacting its monitoring data or assigned tasks. This operation
+is not allowed for MON groups which monitor CPUs. No other move
+operation is currently allowed other than simply renaming a CTRL_MON or
+MON group.
+
 All groups contain the following files:
 
 "tasks":