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authorMichal Hocko <mhocko@kernel.org>2021-01-18 17:12:19 +0300
committerIngo Molnar <mingo@kernel.org>2021-02-17 16:12:24 +0300
commit6ef869e0647439af0fc28dde162d33320d4e1dd7 (patch)
treed9f08abf364f601b9b2ff6225fb4118b9ff739d4 /block/blk-rq-qos.c
parent29fd01944b7273bb630c649a2104b7f9e4ef3fa6 (diff)
downloadlinux-6ef869e0647439af0fc28dde162d33320d4e1dd7.tar.xz
preempt: Introduce CONFIG_PREEMPT_DYNAMIC
Preemption mode selection is currently hardcoded on Kconfig choices. Introduce a dedicated option to tune preemption flavour at boot time, This will be only available on architectures efficiently supporting static calls in order not to tempt with the feature against additional overhead that might be prohibitive or undesirable. CONFIG_PREEMPT_DYNAMIC is automatically selected by CONFIG_PREEMPT if the architecture provides the necessary support (CONFIG_STATIC_CALL_INLINE, CONFIG_GENERIC_ENTRY, and provide with __preempt_schedule_function() / __preempt_schedule_notrace_function()). Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Michal Hocko <mhocko@suse.com> Signed-off-by: Frederic Weisbecker <frederic@kernel.org> [peterz: relax requirement to HAVE_STATIC_CALL] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/20210118141223.123667-5-frederic@kernel.org
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