Re: [PATCH -next] genirq: Add SPARSE_NR_IRQS Kconfig option

[chenlifu]

在 2022/10/18 9:22, chenlifu 写道:
> 在 2022/9/30 16:58, Chen Lifu 写道:
> > On a large-scale multi-core and NUMA platform, more than 1024 cores and
> > 16 NUMA nodes for example, even if SPASE_IRQ is selected to increase the
> > number of interrupt numbers by 8196 base on NR_IRQS, the interrupt 
> > numbers
> > requirement cannot be met. Therefore, make the number of sparse interrupt
> > numbers configurable.
> >
> > Signed-off-by: Chen Lifu <chenlifu@xxxxxxxxxx>
> > ---
> >   kernel/irq/Kconfig     | 8 ++++++++
> >   kernel/irq/internals.h | 2 +-
> >   2 files changed, 9 insertions(+), 1 deletion(-)
> >
> > diff --git a/kernel/irq/Kconfig b/kernel/irq/Kconfig
> > index db3d174c53d4..b517b820e329 100644
> > --- a/kernel/irq/Kconfig
> > +++ b/kernel/irq/Kconfig
> > @@ -123,10 +123,18 @@ config SPARSE_IRQ
> >         ( Sparse irqs can also be beneficial on NUMA boxes, as they 
> > spread
> >           out the interrupt descriptors in a more NUMA-friendly way. )
> >         If you don't know what to do here, say N.
> > +config SPARSE_NR_IRQS
> > +    int "Number of sparse interrupt numbers"
> > +    depends on SPARSE_IRQ
> > +    default 8196
> > +    help
> > +      This defines the maximum number of interrupt numbers
> > +      that can be dynamically expanded.
> > +
> >   config GENERIC_IRQ_DEBUGFS
> >       bool "Expose irq internals in debugfs"
> >       depends on DEBUG_FS
> >       select GENERIC_IRQ_INJECTION
> >       default n
> > diff --git a/kernel/irq/internals.h b/kernel/irq/internals.h
> > index f09c60393e55..ab8ac93c60e6 100644
> > --- a/kernel/irq/internals.h
> > +++ b/kernel/irq/internals.h
> > @@ -10,11 +10,11 @@
> >   #include <linux/kernel_stat.h>
> >   #include <linux/pm_runtime.h>
> >   #include <linux/sched/clock.h>
> >   #ifdef CONFIG_SPARSE_IRQ
> > -# define IRQ_BITMAP_BITS    (NR_IRQS + 8196)
> > +# define IRQ_BITMAP_BITS    (NR_IRQS + CONFIG_SPARSE_NR_IRQS)
> >   #else
> >   # define IRQ_BITMAP_BITS    NR_IRQS
> >   #endif
> >   #define istate core_internal_state__do_not_mess_with_it
>
> Friendly ping ...

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