Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1494401

[PATCH v5 6/9] x86/sched: Add SD_ASYM_PACKING flags to x86 ITMT CPU

Show all headers | View raw

From: Tim Chen <tim.c.chen@linux.intel.com>

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.

Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
---
 arch/x86/kernel/smpboot.c | 28 ++++++++++++++++++++++++----
 1 file changed, 24 insertions(+), 4 deletions(-)

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 38901b3..607cbe6 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -487,22 +487,42 @@ 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, },
-- 
2.7.4

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v5 0/9] Support Intel® Turbo Boost Max Technology 3.0 Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-10-01 13:50 +0200
  [PATCH v5 8/9] acpi: bus: Set _OSC for diverse core support Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-10-01 13:50 +0200
  [PATCH v5 3/9] x86/topology: Define x86's arch_update_cpu_topology Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-10-01 13:50 +0200
  [PATCH v5 4/9] x86: Enable Intel Turbo Boost Max Technology 3.0 Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-10-01 13:50 +0200
    Re: [PATCH v5 4/9] x86: Enable Intel Turbo Boost Max Technology  3.0 Thomas Gleixner <tglx@linutronix.de> - 2016-10-05 16:30 +0200
      Re: [PATCH v5 4/9] x86: Enable Intel Turbo Boost Max Technology 3.0 Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-05 18:10 +0200
  [PATCH v5 6/9] x86/sched: Add SD_ASYM_PACKING flags to x86 ITMT CPU Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-10-01 13:50 +0200
  [PATCH v5 2/9] x86/topology: Provide topology_num_packages() Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-10-01 13:50 +0200
  [PATCH v5 1/9] sched: Extend scheduler's asym packing Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> - 2016-10-01 13:50 +0200
    Re: [PATCH v5 1/9] sched: Extend scheduler's asym packing Nilay Vaish <nilayvaish@gmail.com> - 2016-10-01 18:40 +0200
      Re: [PATCH v5 1/9] sched: Extend scheduler's asym packing Tim Chen <tim.c.chen@linux.intel.com> - 2016-10-03 18:50 +0200

csiph-web