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166d6008fa
[ Upstream commit ebc0f83c78a2d26384401ecf2d2fa48063c0ee27 ] The way loadavg is tracked during nohz only pays attention to the load upon entering nohz. This can be particularly noticeable if full nohz is entered while non-idle, and then the cpu goes idle and stays that way for a long time. Use the remote tick to ensure that full nohz cpus report their deltas within a reasonable time. [ swood: Added changelog and removed recheck of stopped tick. ] Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Scott Wood <swood@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Ingo Molnar <mingo@kernel.org> Link: https://lkml.kernel.org/r/1578736419-14628-3-git-send-email-swood@redhat.com Signed-off-by: Sasha Levin <sashal@kernel.org>
33 lines
907 B
C
33 lines
907 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_SCHED_NOHZ_H
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#define _LINUX_SCHED_NOHZ_H
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/*
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* This is the interface between the scheduler and nohz/dynticks:
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*/
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#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ_COMMON)
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extern void nohz_balance_enter_idle(int cpu);
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extern int get_nohz_timer_target(void);
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#else
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static inline void nohz_balance_enter_idle(int cpu) { }
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#endif
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#ifdef CONFIG_NO_HZ_COMMON
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void calc_load_nohz_start(void);
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void calc_load_nohz_remote(struct rq *rq);
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void calc_load_nohz_stop(void);
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#else
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static inline void calc_load_nohz_start(void) { }
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static inline void calc_load_nohz_remote(struct rq *rq) { }
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static inline void calc_load_nohz_stop(void) { }
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#endif /* CONFIG_NO_HZ_COMMON */
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#if defined(CONFIG_NO_HZ_COMMON) && defined(CONFIG_SMP)
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extern void wake_up_nohz_cpu(int cpu);
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#else
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static inline void wake_up_nohz_cpu(int cpu) { }
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#endif
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#endif /* _LINUX_SCHED_NOHZ_H */
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