Commit-ID: 4be6c078428b08d1a948cc09faca8f1326231866 Gitweb: http://git.kernel.org/tip/4be6c078428b08d1a948cc09faca8f1326231866 Author: Vikas Shivappa <vikas.shiva...@linux.intel.com> AuthorDate: Tue, 25 Jul 2017 14:14:42 -0700 Committer: Thomas Gleixner <t...@linutronix.de> CommitDate: Tue, 1 Aug 2017 22:41:27 +0200
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.shiva...@linux.intel.com> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Cc: ravi.v.shan...@intel.com Cc: tony.l...@intel.com Cc: fenghua...@intel.com Cc: pet...@infradead.org Cc: eran...@google.com Cc: vikas.shiva...@intel.com Cc: a...@linux.intel.com Cc: davi...@google.com Cc: reinette.cha...@intel.com Link: http://lkml.kernel.org/r/1501017287-28083-24-git-send-email-vikas.shiva...@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 @@ 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) {}
