Re: [PATCH] powerpc/time: enable sched clock for irqtime
From: Pingfan Liu <hidden>
Date: 2020-10-22 07:11:35
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 [off-list ref] wrote:
quoted hunk ↗ jump to hunk
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 <redacted> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Christophe Leroy <redacted> Cc: Nicholas Piggin <npiggin@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