linux-kernel - [PATCH 23/28] x86/intel_rdt: Introduce rdt_enable

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Date:   Tue, 25 Jul 2017 14:14:42 -0700
From:   Vikas Shivappa <vikas.shivappa@...ux.intel.com>
To:     vikas.shivappa@...el.com
Cc:     vikas.shivappa@...ux.intel.com, x86@...nel.org,
        linux-kernel@...r.kernel.org, hpa@...or.com, tglx@...utronix.de,
        peterz@...radead.org, ravi.v.shankar@...el.com,
        tony.luck@...el.com, fenghua.yu@...el.com, eranian@...gle.com,
        davidcc@...gle.com, ak@...ux.intel.com, reinette.chatre@...el.com
Subject: [PATCH 23/28] x86/intel_rdt: Introduce rdt_enable_key for scheduling

Introduce the usage of rdt_enable_key in sched_in code as a preparation
to add RDT monitoring support for sched_in.

Signed-off-by: Vikas Shivappa <vikas.shivappa@...ux.intel.com>
---
 arch/x86/include/asm/intel_rdt_sched.h | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/intel_rdt_sched.h b/arch/x86/include/asm/intel_rdt_sched.h
index 2c704d2..8c5be01 100644
--- a/arch/x86/include/asm/intel_rdt_sched.h
+++ b/arch/x86/include/asm/intel_rdt_sched.h
@@ -27,10 +27,12 @@ struct intel_pqr_state {
 
 DECLARE_PER_CPU(struct intel_pqr_state, pqr_state);
 DECLARE_PER_CPU_READ_MOSTLY(struct intel_pqr_state, rdt_cpu_default);
+
+DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
 DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
 
 /*
- * intel_rdt_sched_in() - Writes the task's CLOSid to IA32_PQR_MSR
+ * __intel_rdt_sched_in() - Writes the task's CLOSid to IA32_PQR_MSR
  *
  * Following considerations are made so that this has minimal impact
  * on scheduler hot path:
@@ -42,7 +44,7 @@ struct intel_pqr_state {
  *
  * Must be called with preemption disabled.
  */
-static inline void intel_rdt_sched_in(void)
+static inline void __intel_rdt_sched_in(void)
 {
 	if (static_branch_likely(&rdt_alloc_enable_key)) {
 		struct intel_pqr_state *state = this_cpu_ptr(&pqr_state);
@@ -63,6 +65,12 @@ static inline void intel_rdt_sched_in(void)
 	}
 }
 
+static inline void intel_rdt_sched_in(void)
+{
+	if (static_branch_likely(&rdt_enable_key))
+		__intel_rdt_sched_in();
+}
+
 #else
 
 static inline void intel_rdt_sched_in(void) {}
-- 
1.9.1