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From: "Fenghua Yu" <fenghua.yu@intel.com>
To: "Thomas Gleixner" <tglx@linutronix.de>,
        "H. Peter Anvin" <h.peter.anvin@intel.com>,
        "Ingo Molnar" <mingo@elte.hu>, "Tony Luck" <tony.luck@intel.com>,
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        "Borislav Petkov" <bp@suse.de>,
        "Stephane Eranian" <eranian@google.com>,
        "Marcelo Tosatti" <mtosatti@redhat.com>,
        "David Carrillo-Cisneros" <davidcc@google.com>,
        "Shaohua Li" <shli@fb.com>,
        "Ravi V Shankar" <ravi.v.shankar@intel.com>,
        "Vikas Shivappa" <vikas.shivappa@linux.intel.com>,
        "Sai Prakhya" <sai.praneeth.prakhya@intel.com>
Cc: "linux-kernel" <linux-kernel@vger.kernel.org>, "x86" <x86@kernel.org>,
        Fenghua Yu <fenghua.yu@intel.com>
Subject: [PATCH v2 23/33] x86/intel_rdt_rdtgroup.c: User interface for RDT
Date: Thu,  8 Sep 2016 02:57:17 -0700
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From: Fenghua Yu <fenghua.yu@intel.com>

We introduce a new resctrl file system mounted under /sys/fs/resctrl.
User uses this file system to control resource allocation.

Hiearchy of the file system is as follows:
/sys/fs/resctrl/info/info
		    /<resource0>/<resource0 specific info files>
		    /<resource1>/<resource1 specific info files>
			....
		/tasks
		/cpus
		/schemata
		/sub-dir1
		/sub-dir2
		....

User can specify which task uses which schemata for resource allocation.

More details can be found in Documentation/x86/intel_rdt_ui.txt

Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
---
 arch/x86/include/asm/intel_rdt.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/include/asm/intel_rdt.h b/arch/x86/include/asm/intel_rdt.h
index 85beecc..aaed4b4 100644
--- a/arch/x86/include/asm/intel_rdt.h
+++ b/arch/x86/include/asm/intel_rdt.h
@@ -40,6 +40,8 @@ struct cache_domain {
 	unsigned int shared_cache_id[MAX_CACHE_DOMAINS];
 };
 
+extern struct cache_domain cache_domains[MAX_CACHE_LEAVES];
+
 extern struct rdt_opts rdt_opts;
 
 struct clos_cbm_table {
-- 
2.5.0