sched: Clean up scheduler_ipi()

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The scheduler IPI has grown weird and wonderful over the years, time
for spring cleaning.

Move all the non-trivial stuff out of it and into a regular smp function
call IPI. This then reduces the schedule_ipi() to most of it's former NOP
glory and ensures to keep the interrupt vector lean and mean.

Aside of that avoiding the full irq_enter() in the x86 IPI implementation
is incorrect as scheduler_ipi() can be instrumented. To work around that
scheduler_ipi() had an irq_enter/exit() hack when heavy work was
pending. This is gone now.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexandre Chartre <alexandre.chartre@oracle.com>
Link: https://lkml.kernel.org/r/20200505134058.361859938@linutronix.de

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Peter Zijlstra (Intel) 2020-03-27 11:44:56 +01:00 • committed by Thomas Gleixner

parent b1d1779e5e

commit 90b5363acd

3 changed files with 36 additions and 39 deletions

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64

kernel/sched/core.c

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5

kernel/sched/fair.c

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6

kernel/sched/sched.h

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