I encounter a irq flood on Power9 machine, and tries a way to work around it by https://www.spinics.net/lists/kernel/msg3705028.html
As irq time accounting is the foundation for the method, it needs to make irq accounting take effect on powerpc platform. On Thu, Oct 22, 2020 at 2:51 PM Pingfan Liu <kernelf...@gmail.com> wrote: > > When CONFIG_IRQ_TIME_ACCOUNTING and CONFIG_VIRT_CPU_ACCOUNTING_GEN, powerpc > does not enable "sched_clock_irqtime" and can not utilize irq time > accounting. > > Like x86, powerpc does not use the sched_clock_register() interface. So it > needs an dedicated call to enable_sched_clock_irqtime() to enable irq time > accounting. > > Signed-off-by: Pingfan Liu <kernelf...@gmail.com> > Cc: Michael Ellerman <m...@ellerman.id.au> > Cc: Christophe Leroy <christophe.le...@c-s.fr> > Cc: Nicholas Piggin <npig...@gmail.com> > To: linuxppc-dev@lists.ozlabs.org > --- > arch/powerpc/kernel/time.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c > index f85539e..4083b59e 100644 > --- a/arch/powerpc/kernel/time.c > +++ b/arch/powerpc/kernel/time.c > @@ -53,6 +53,7 @@ > #include <linux/of_clk.h> > #include <linux/suspend.h> > #include <linux/sched/cputime.h> > +#include <linux/sched/clock.h> > #include <linux/processor.h> > #include <asm/trace.h> > > @@ -1134,6 +1135,7 @@ void __init time_init(void) > tick_setup_hrtimer_broadcast(); > > of_clk_init(NULL); > + enable_sched_clock_irqtime(); > } > > /* > -- > 2.7.5 >
