sched_ext: Introduce scx_bpf_cpu_curr()

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Provide scx_bpf_cpu_curr() as a way for scx schedulers to check the curr
task of a remote rq without assuming its lock is held.

Many scx schedulers make use of scx_bpf_cpu_rq() to check a remote curr
(e.g. to see if it should be preempted). This is problematic because
scx_bpf_cpu_rq() provides access to all fields of struct rq, most of
which aren't safe to use without holding the associated rq lock.

Signed-off-by: Christian Loehle <christian.loehle@arm.com>
Acked-by: Andrea Righi <arighi@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

...

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Christian Loehle 2025-09-03 22:23:10 +01:00 • committed by Tejun Heo

parent e0ca169638

commit 20b158094a

2 changed files with 15 additions and 0 deletions

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14

kernel/sched/ext.c

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1

tools/sched_ext/include/scx/common.bpf.h

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