linux-kernel - [tip:x86/cache] x86/intel_rdt: Add L2CDP support in documentation

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Message-ID: <tip-aa55d5a4bd919f26fce519c470d11a58541c6aa7@git.kernel.org>
Date:   Thu, 18 Jan 2018 00:37:32 -0800
From:   tip-bot for Fenghua Yu <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, linux-kernel@...r.kernel.org,
        vikas.shivappa@...el.com, tony.luck@...el.com, tglx@...utronix.de,
        sai.praneeth.prakhya@...el.com, reinette.chatre@...el.com,
        ravi.v.shankar@...el.com, mingo@...nel.org, fenghua.yu@...el.com
Subject: [tip:x86/cache] x86/intel_rdt: Add L2CDP support in documentation

Commit-ID:  aa55d5a4bd919f26fce519c470d11a58541c6aa7
Gitweb:     https://git.kernel.org/tip/aa55d5a4bd919f26fce519c470d11a58541c6aa7
Author:     Fenghua Yu <fenghua.yu@...el.com>
AuthorDate: Wed, 20 Dec 2017 14:57:20 -0800
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Thu, 18 Jan 2018 09:33:30 +0100

x86/intel_rdt: Add L2CDP support in documentation

L2 and L3 Code and Data Prioritization (CDP) can be enabled separately.
The existing mount parameter "cdp" is only for enabling L3 CDP and will be
kept for backwards compability.

Add a new mount parameter 'cdpl2' for L2 CDP.

[ tglx: Made changelog readable ]

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: "Ravi V Shankar" <ravi.v.shankar@...el.com>
Cc: "Tony Luck" <tony.luck@...el.com>
Cc: Vikas" <vikas.shivappa@...el.com>
Cc: Sai Praneeth" <sai.praneeth.prakhya@...el.com>
Cc: Reinette" <reinette.chatre@...el.com>
Link: https://lkml.kernel.org/r/1513810644-78015-3-git-send-email-fenghua.yu@intel.com


---
 Documentation/x86/intel_rdt_ui.txt | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt
index 1ad77b1..756fd76 100644
--- a/Documentation/x86/intel_rdt_ui.txt
+++ b/Documentation/x86/intel_rdt_ui.txt
@@ -10,18 +10,21 @@ This feature is enabled by the CONFIG_INTEL_RDT Kconfig and the
 X86 /proc/cpuinfo flag bits:
 RDT (Resource Director Technology) Allocation - "rdt_a"
 CAT (Cache Allocation Technology) - "cat_l3", "cat_l2"
-CDP (Code and Data Prioritization ) - "cdp_l3"
+CDP (Code and Data Prioritization ) - "cdp_l3", "cdp_l2"
 CQM (Cache QoS Monitoring) - "cqm_llc", "cqm_occup_llc"
 MBM (Memory Bandwidth Monitoring) - "cqm_mbm_total", "cqm_mbm_local"
 MBA (Memory Bandwidth Allocation) - "mba"
 
 To use the feature mount the file system:
 
- # mount -t resctrl resctrl [-o cdp] /sys/fs/resctrl
+ # mount -t resctrl resctrl [-o cdp[,cdpl2]] /sys/fs/resctrl
 
 mount options are:
 
 "cdp": Enable code/data prioritization in L3 cache allocations.
+"cdpl2": Enable code/data prioritization in L2 cache allocations.
+
+L2 and L3 CDP are controlled seperately.
 
 RDT features are orthogonal. A particular system may support only
 monitoring, only control, or both monitoring and control.