diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2020-11-17 18:19:34 -0500 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-05-12 11:43:27 +0200 |
| commit | 9edeaea1bc452372718837ed2ba775811baf1ba1 (patch) | |
| tree | a4c002b7be5b284c0f7d2bd6647e602b482fc4aa /kernel/Kconfig.preempt | |
| parent | d66f1b06b5b438cd20ba3664b8eef1f9c79e84bf (diff) | |
| download | lwn-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.preempt | 6 |
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 + |