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Date: Thu, 18 Aug 2016 15:36:43 -0700
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
rjw@...ysocki.net, peterz@...radead.org
Cc: x86@...nel.org, bp@...e.de, sudeep.holla@....com,
ak@...ux.intel.com, linux-acpi@...r.kernel.org,
linux-pm@...r.kernel.org, alexey.klimov@....com,
viresh.kumar@...aro.org, akpm@...ux-foundation.org,
linux-kernel@...r.kernel.org, lenb@...nel.org,
tim.c.chen@...ux.intel.com, srinivas.pandruvada@...ux.intel.com,
paul.gortmaker@...driver.com, jpoimboe@...hat.com,
mcgrof@...nel.org, jgross@...e.com, robert.moore@...el.com,
dvyukov@...gle.com, jeyu@...hat.com
Subject: [PATCH 02/11] sched, x86: Add SD_ASYM_PACKING flags to x86 cpu topology for cpus supporting Intel Turbo Boost Max Technology
From: Tim Chen <tim.c.chen@...ux.intel.com>
We uses ASYM_PACKING feature in the scheduler to move tasks to more
capable cpus that can be boosted to higher frequency. We mark the sched
domain topology level with SD_ASYM_PACKING flag for such systems.
Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
arch/x86/kernel/smpboot.c | 77 ++++++++++++++++++++++++++++++++++++-----------
kernel/sched/core.c | 3 ++
2 files changed, 62 insertions(+), 18 deletions(-)
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 2a6e84a..255f64e 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -464,31 +464,59 @@ static bool match_die(struct cpuinfo_x86 *c, struct cpuinfo_x86 *o)
return false;
}
-static struct sched_domain_topology_level numa_inside_package_topology[] = {
+#ifdef CONFIG_SCHED_ITMT
+extern unsigned int sysctl_sched_itmt_enabled;
+
+static int x86_core_flags(void)
+{
+ int flags = cpu_core_flags();
+
+ if (sysctl_sched_itmt_enabled)
+ flags |= SD_ASYM_PACKING;
+
+ return flags;
+}
+
+static int x86_smt_flags(void)
+{
+ int flags = cpu_smt_flags();
+
+ if (sysctl_sched_itmt_enabled)
+ flags |= SD_ASYM_PACKING;
+
+ return flags;
+}
+#else
+#define x86_core_flags cpu_core_flags
+#define x86_smt_flags cpu_smt_flags
+#endif
+
+static struct sched_domain_topology_level x86_topology[] = {
+#ifdef CONFIG_SCHED_SMT
+ { cpu_smt_mask, x86_smt_flags, SD_INIT_NAME(SMT) },
+#endif
+#ifdef CONFIG_SCHED_MC
+ { cpu_coregroup_mask, x86_core_flags, SD_INIT_NAME(MC) },
+#endif
+ { cpu_cpu_mask, SD_INIT_NAME(DIE) },
+ { NULL, },
+};
+
+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, },
};
+
/*
- * set_sched_topology() sets the topology internal to a CPU. The
- * NUMA topologies are layered on top of it to build the full
- * system topology.
- *
- * If NUMA nodes are observed to occur within a CPU package, this
- * function should be called. It forces the sched domain code to
- * only use the SMT level for the CPU portion of the topology.
- * This essentially falls back to relying on NUMA information
- * from the SRAT table to describe the entire system topology
- * (except for hyperthreads).
+ * Set if a package/die has multiple NUMA nodes inside.
+ * AMD Magny-Cours and Intel Cluster-on-Die have this.
*/
-static void primarily_use_numa_for_topology(void)
-{
- set_sched_topology(numa_inside_package_topology);
-}
+static bool x86_has_numa_in_package = false;
void set_cpu_sibling_map(int cpu)
{
@@ -551,7 +579,7 @@ void set_cpu_sibling_map(int cpu)
c->booted_cores = cpu_data(i).booted_cores;
}
if (match_die(c, o) && !topology_same_node(c, o))
- primarily_use_numa_for_topology();
+ x86_has_numa_in_package = true;
}
threads = cpumask_weight(topology_sibling_cpumask(cpu));
@@ -1297,6 +1325,16 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
}
+
+ /*
+ * Set 'default' x86 topology, this matches default_topology() in that
+ * it has NUMA nodes as a topology level. See also
+ * native_smp_cpus_done().
+ *
+ * Must be done before set_cpus_sibling_map() is ran.
+ */
+ set_sched_topology(x86_topology);
+
set_cpu_sibling_map(0);
switch (smp_sanity_check(max_cpus)) {
@@ -1363,6 +1401,9 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
{
pr_debug("Boot done\n");
+ if (x86_has_numa_in_package)
+ set_sched_topology(x86_numa_in_package_topology);
+
nmi_selftest();
impress_friends();
setup_ioapic_dest();
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ec752da..342eca9 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6487,6 +6487,9 @@ static struct sched_domain_topology_level *sched_domain_topology =
void set_sched_topology(struct sched_domain_topology_level *tl)
{
+ if (WARN_ON_ONCE(sched_smp_initialized))
+ return;
+
sched_domain_topology = tl;
}
--
2.7.4
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