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authorPeter Zijlstra <peterz@infradead.org>2020-11-17 18:19:34 -0500
committerPeter Zijlstra <peterz@infradead.org>2021-05-12 11:43:27 +0200
commit9edeaea1bc452372718837ed2ba775811baf1ba1 (patch)
treea4c002b7be5b284c0f7d2bd6647e602b482fc4aa /kernel/Kconfig.preempt
parentd66f1b06b5b438cd20ba3664b8eef1f9c79e84bf (diff)
downloadlwn-9edeaea1bc452372718837ed2ba775811baf1ba1.tar.gz
lwn-9edeaea1bc452372718837ed2ba775811baf1ba1.zip
sched: Core-wide rq->lock
Introduce the basic infrastructure to have a core wide rq->lock. This relies on the rq->__lock order being in increasing CPU number (inside a core). It is also constrained to SMT8 per lockdep (and SMT256 per preempt_count). Luckily SMT8 is the max supported SMT count for Linux (Mips, Sparc and Power are known to have this). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Don Hiatt <dhiatt@digitalocean.com> Tested-by: Hongyu Ning <hongyu.ning@linux.intel.com> Tested-by: Vincent Guittot <vincent.guittot@linaro.org> Link: https://lkml.kernel.org/r/YJUNfzSgptjX7tG6@hirez.programming.kicks-ass.net
Diffstat (limited to 'kernel/Kconfig.preempt')
-rw-r--r--kernel/Kconfig.preempt6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt
index 416017301660..ea1e3331c0ba 100644
--- a/kernel/Kconfig.preempt
+++ b/kernel/Kconfig.preempt
@@ -99,3 +99,9 @@ config PREEMPT_DYNAMIC
Interesting if you want the same pre-built kernel should be used for
both Server and Desktop workloads.
+
+config SCHED_CORE
+ bool "Core Scheduling for SMT"
+ default y
+ depends on SCHED_SMT
+