x86/sched: Add SD_ASYM_PACKING flags to x86 ITMT CPU (d3d37d85) · Commits · 戴 / test

Some Intel cores in a package can be boosted to a higher turbo frequency with ITMT 3.0 technology. The scheduler can use the asymmetric packing feature to move tasks to the more capable cores. If ITMT is enabled, add SD_ASYM_PACKING flag to the thread and core sched domains to enable asymmetric packing. Co-developed-by:

Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:

Tim Chen <tim.c.chen@linux.intel.com> Cc: linux-pm@vger.kernel.org Cc: peterz@infradead.org Cc: jolsa@redhat.com Cc: rjw@rjwysocki.net Cc: linux-acpi@vger.kernel.org Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Cc: bp@suse.de Link: http://lkml.kernel.org/r/9bbb885bedbef4eb50e197305eb16b160cff0831.1479844244.git.tim.c.chen@linux.intel.com Signed-off-by:

Thomas Gleixner <tglx@linutronix.de>

arch/x86/kernel/smpboot.c

+24 −4

Original line number	Diff line number	Diff line
		@@ -482,22 +482,42 @@ static bool match_die(struct cpuinfo_x86 c, struct cpuinfo_x86 o)
		return false;
		}

		#if defined(CONFIG_SCHED_SMT) \|\| defined(CONFIG_SCHED_MC)
		static inline int x86_sched_itmt_flags(void)
		{
		return sysctl_sched_itmt_enabled ? SD_ASYM_PACKING : 0;
		}

		#ifdef CONFIG_SCHED_MC
		static int x86_core_flags(void)
		{
		return cpu_core_flags() \| x86_sched_itmt_flags();
		}
		#endif
		#ifdef CONFIG_SCHED_SMT
		static int x86_smt_flags(void)
		{
		return cpu_smt_flags() \| x86_sched_itmt_flags();
		}
		#endif
		#endif

		static struct sched_domain_topology_level x86_numa_in_package_topology[] = {
		#ifdef CONFIG_SCHED_SMT
		{ cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
		{ cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) },
		#endif
		#ifdef CONFIG_SCHED_MC
		{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
		{ cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC) },
		#endif
		{ NULL, },
		};

		static struct sched_domain_topology_level x86_topology[] = {
		#ifdef CONFIG_SCHED_SMT
		{ cpu_smt_mask, cpu_smt_flags, SD_INIT_NAME(SMT) },
		{ cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) },
		#endif
		#ifdef CONFIG_SCHED_MC
		{ cpu_coregroup_mask, cpu_core_flags, SD_INIT_NAME(MC) },
		{ cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC) },
		#endif
		{ cpu_cpu_mask, SD_INIT_NAME(DIE) },
		{ NULL, },

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