73a400646b
Currently, sending an interprocessor interrupt (IPI) requires building up a message dynamically which means memory allocation. But often times, we will want to send an IPI in low level contexts where allocation is not possible which may lead to a panic(). So create a per-cpu static array for the message queue and use that instead. Further, while we have two supplemental interrupts, we are currently only using one of them. So use the second one for the most common IPI message of all -- smp_send_reschedule(). This avoids ugly contention for locks which in turn would require an IPI message ... In general, this improves SMP performance, and in some cases allows the SMP port to work in places it wouldn't before. Such as the PREEMPT_RT state where the slab is protected by a per-cpu spin lock. If the slab kmalloc/kfree were to put the task to sleep, and that task was actually the IPI handler, then the system falls down yet again. After running some various stress tests on the system, the static limit of 5 messages seems to work. On the off chance even this overflows, we simply panic(), and we can review that scenario to see if the limit needs to be increased a bit more. Signed-off-by: Yi Li <yi.li@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
32 lines
728 B
C
32 lines
728 B
C
/*
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* Copyright 2007-2008 Analog Devices Inc.
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*
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* Licensed under the GPL-2 or later.
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*/
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#ifndef _MACH_BF561_SMP
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#define _MACH_BF561_SMP
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/* This header has to stand alone to avoid circular deps */
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struct task_struct;
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void platform_init_cpus(void);
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void platform_prepare_cpus(unsigned int max_cpus);
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int platform_boot_secondary(unsigned int cpu, struct task_struct *idle);
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void platform_secondary_init(unsigned int cpu);
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void platform_request_ipi(int irq, /*irq_handler_t*/ void *handler);
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void platform_send_ipi(cpumask_t callmap, int irq);
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void platform_send_ipi_cpu(unsigned int cpu, int irq);
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void platform_clear_ipi(unsigned int cpu, int irq);
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void bfin_local_timer_setup(void);
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#endif /* !_MACH_BF561_SMP */
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