sched: Do not construct nor expose RT_GROUP_SCHED structures if disabled

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Thanks to kernel cmdline being available early, before any
cgroup hierarchy exists, we can achieve the RT_GROUP_SCHED boottime
disabling goal by simply skipping any creation (and destruction) of
RT_GROUP data and its exposure via RT attributes.

We can do this thanks to previously placed runtime guards that would
redirect all operations to root_task_group's data when RT_GROUP_SCHED
disabled.

Signed-off-by: Michal Koutný <mkoutny@suse.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20250310170442.504716-8-mkoutny@suse.com

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Michal Koutný 2025-03-10 18:04:39 +01:00 • committed by Peter Zijlstra

parent 277e090975

commit d6809c2f60

2 changed files with 33 additions and 12 deletions

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36

kernel/sched/core.c

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9

kernel/sched/rt.c

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