[PATCH v2 4/8] sched, x86: use arch_update_cpu_topology to indicate x86 need sched domain rebuild
From: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Date: 2016-09-01 21:08:55
Also in:
linux-acpi, lkml
Subsystem:
the rest, x86 architecture (32-bit and 64-bit) · Maintainers:
Linus Torvalds, Thomas Gleixner, Ingo Molnar, Borislav Petkov, Dave Hansen
From: Tim Chen <redacted> Provides x86 with arch_update_cpu_topology function. This function allows us to indicate that a condition is detected that the sched domain of x86 needs a complete rebuild. This is done by setting the x86_topology_update flag. Signed-off-by: Tim Chen <redacted> Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> --- arch/x86/include/asm/topology.h | 2 ++ arch/x86/kernel/smpboot.c | 11 +++++++++++ 2 files changed, 13 insertions(+)
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 0bcf3b7..8d6df77 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h@@ -147,6 +147,8 @@ struct pci_bus; int x86_pci_root_bus_node(int bus); void x86_pci_root_bus_resources(int bus, struct list_head *resources); +extern bool x86_topology_update; + #ifdef CONFIG_SCHED_ITMT extern unsigned int __read_mostly sysctl_sched_itmt_enabled; #endif /* CONFIG_SCHED_ITMT */
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 292df31..737b9edf 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c@@ -110,6 +110,17 @@ static bool logical_packages_frozen __read_mostly; int __max_smt_threads __read_mostly; unsigned int __read_mostly sysctl_sched_itmt_enabled; +/* Flag to indicate if a complete sched domain rebuild is required */ +bool x86_topology_update; + +int arch_update_cpu_topology(void) +{ + if (x86_topology_update) { + x86_topology_update = false; + return 1; + } else + return 0; +} static inline void smpboot_setup_warm_reset_vector(unsigned long start_eip) {
--
2.7.4