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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <tip-e1799a80a4f5a463f252b7325da8bb66dfd55471@git.kernel.org>
Date:   Mon, 10 Sep 2018 03:12:45 -0700
From:   tip-bot for Morten Rasmussen <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux@...linux.org.uk, hpa@...or.com, tglx@...utronix.de,
        mingo@...nel.org, morten.rasmussen@....com,
        torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
        peterz@...radead.org
Subject: [tip:sched/core] sched/topology, arch/arm: Rebuild sched_domain
 hierarchy when CPU capacity changes

Commit-ID:  e1799a80a4f5a463f252b7325da8bb66dfd55471
Gitweb:     https://git.kernel.org/tip/e1799a80a4f5a463f252b7325da8bb66dfd55471
Author:     Morten Rasmussen <morten.rasmussen@....com>
AuthorDate: Fri, 20 Jul 2018 14:32:34 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 10 Sep 2018 11:05:48 +0200

sched/topology, arch/arm: Rebuild sched_domain hierarchy when 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 arm. This patch points the arm 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: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Russell King <linux@...linux.org.uk>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: dietmar.eggemann@....com
Cc: valentin.schneider@....com
Cc: vincent.guittot@...aro.org
Link: http://lkml.kernel.org/r/1532093554-30504-5-git-send-email-morten.rasmussen@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/arm/include/asm/topology.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h
index 5d88d2f22b2c..2a786f54d8b8 100644
--- a/arch/arm/include/asm/topology.h
+++ b/arch/arm/include/asm/topology.h
@@ -33,6 +33,9 @@ const struct cpumask *cpu_coregroup_mask(int cpu);
 /* 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
+
 #else
 
 static inline void init_cpu_topology(void) { }