linux-kernel - [tip:sched/core] sched/topology, arch/arm64: Rebuild the sched_domain hierarchy when the CPU capacity changes

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Date:   Mon, 10 Sep 2018 03:12:13 -0700
From:   tip-bot for Morten Rasmussen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     torvalds@...ux-foundation.org, tglx@...utronix.de,
        will.deacon@....com, peterz@...radead.org, mingo@...nel.org,
        hpa@...or.com, linux-kernel@...r.kernel.org,
        morten.rasmussen@....com, catalin.marinas@....com
Subject: [tip:sched/core] sched/topology, arch/arm64: Rebuild the
 sched_domain hierarchy when the CPU capacity changes

Commit-ID:  3ba09df4b8b6e3f01ed6381e8fb890840fd0bca3
Gitweb:     https://git.kernel.org/tip/3ba09df4b8b6e3f01ed6381e8fb890840fd0bca3
Author:     Morten Rasmussen <morten.rasmussen@....com>
AuthorDate: Fri, 20 Jul 2018 14:32:33 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 10 Sep 2018 11:05:47 +0200

sched/topology, arch/arm64: Rebuild the sched_domain hierarchy when the CPU capacity changes

Asymmetric CPU capacity can not necessarily be determined accurately at
the time the initial sched_domain hierarchy is built during boot. It is
therefore necessary to be able to force a full rebuild of the hierarchy
later triggered by the arch_topology driver. A full rebuild requires the
arch-code to implement arch_update_cpu_topology() which isn't yet
implemented for arm64. This patch points the arm64 implementation to
arch_topology driver to ensure that full hierarchy rebuild happens when
needed.

Signed-off-by: Morten Rasmussen <morten.rasmussen@....com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Will Deacon <will.deacon@....com>
Cc: dietmar.eggemann@....com
Cc: valentin.schneider@....com
Cc: vincent.guittot@...aro.org
Link: http://lkml.kernel.org/r/1532093554-30504-4-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/arm64/include/asm/topology.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/include/asm/topology.h b/arch/arm64/include/asm/topology.h
index 49a0fee4f89b..0524f2438649 100644
--- a/arch/arm64/include/asm/topology.h
+++ b/arch/arm64/include/asm/topology.h
@@ -45,6 +45,9 @@ int pcibus_to_node(struct pci_bus *bus);
 /* Replace task scheduler's default cpu-invariant accounting */
 #define arch_scale_cpu_capacity topology_get_cpu_scale
 
+/* Enable topology flag updates */
+#define arch_update_cpu_topology topology_update_cpu_topology
+
 #include <asm-generic/topology.h>
 
 #endif /* _ASM_ARM_TOPOLOGY_H */