sched: Core-wide rq->lock

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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

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This commit is contained in:

Peter Zijlstra 2020-11-17 18:19:34 -05:00

parent d66f1b06b5

commit 9edeaea1bc

3 changed files with 224 additions and 4 deletions

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6

kernel/Kconfig.preempt

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164

kernel/sched/core.c

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58

kernel/sched/sched.h

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