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Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86/cache updates from Thomas Gleixner:
 "A set of patches which add support for L2 cache partitioning to the
  Intel RDT facility"

* 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/intel_rdt: Add command line parameter to control L2_CDP
  x86/intel_rdt: Enable L2 CDP in MSR IA32_L2_QOS_CFG
  x86/intel_rdt: Add two new resources for L2 Code and Data Prioritization (CDP)
  x86/intel_rdt: Enumerate L2 Code and Data Prioritization (CDP) feature
  x86/intel_rdt: Add L2CDP support in documentation
  x86/intel_rdt: Update documentation
This commit is contained in:
Linus Torvalds 2018-01-29 17:48:22 -08:00
commit f0b13428c9
7 changed files with 169 additions and 39 deletions
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13
Documentation/x86/intel_rdt_ui.txt
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@ -7,15 +7,24 @@ Tony Luck <[email protected]>
Vikas Shivappa <[email protected]>
This feature is enabled by the CONFIG_INTEL_RDT Kconfig and the
X86 /proc/cpuinfo flag bits "rdt", "cqm", "cat_l3" and "cdp_l3".
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_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.