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Subject[PATCH 23/28] x86/intel_rdt: Introduce rdt_enable_key for scheduling
Date
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@linux.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
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