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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@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: peterz@infradead.org
Cc: eranian@google.com
Cc: vikas.shivappa@intel.com
Cc: ak@linux.intel.com
Cc: davidcc@google.com
Cc: reinette.chatre@intel.com
Link: http://lkml.kernel.org/r/1501017287-28083-24-git-send-email-vikas.shivappa@linux.intel.com
This commit is contained in:
Vikas Shivappa 2017-07-25 14:14:42 -07:00 committed by Thomas Gleixner
parent 4af4a88e0c
commit 4be6c07842
1 changed files with 10 additions and 2 deletions
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12
arch/x86/include/asm/intel_rdt_sched.h
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@ -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 @@ DECLARE_STATIC_KEY_FALSE(rdt_alloc_enable_key);
*
* 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) {}