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authorFenghua Yu <fenghua.yu@intel.com>2017-12-20 14:57:20 -0800
committerThomas Gleixner <tglx@linutronix.de>2018-01-18 09:33:30 +0100
commitaa55d5a4bd919f26fce519c470d11a58541c6aa7 (patch)
treefe5323fdc849c065968af3a46381eb9ce2702d36 /Documentation/x86
parent0ff8e080b18d1d2dbe5c866d5f31c27ab806a785 (diff)
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@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: "Ravi V Shankar" <ravi.v.shankar@intel.com> Cc: "Tony Luck" <tony.luck@intel.com> Cc: Vikas" <vikas.shivappa@intel.com> Cc: Sai Praneeth" <sai.praneeth.prakhya@intel.com> Cc: Reinette" <reinette.chatre@intel.com> Link: https://lkml.kernel.org/r/1513810644-78015-3-git-send-email-fenghua.yu@intel.com
Diffstat (limited to 'Documentation/x86')
-rw-r--r--Documentation/x86/intel_rdt_ui.txt7
1 files changed, 5 insertions, 2 deletions
diff --git a/Documentation/x86/intel_rdt_ui.txt b/Documentation/x86/intel_rdt_ui.txt
index 1ad77b1e3e79..756fd76b78a6 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.