[RFC PATCH 4/5] irq_work: Trace calls to arch_irq_work_raise()
From: Valentin Schneider <vschneid@redhat.com>
Date: 2022-10-07 15:46:39
Also in:
linux-alpha, linux-arm-kernel, linux-mips, linux-riscv, linux-s390, linux-sh, lkml, loongarch, sparclinux
Subsystem:
the rest · Maintainer:
Linus Torvalds
Adding a tracepoint to send_call_function_single_ipi() covers irq_work_queue_on() when the CPU isn't the local one - add a tracepoint to irq_work_raise() to cover the other cases. Signed-off-by: Valentin Schneider <vschneid@redhat.com> --- kernel/irq_work.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 7afa40fe5cc4..5a550b681878 100644
--- a/kernel/irq_work.c
+++ b/kernel/irq_work.c@@ -22,6 +22,8 @@ #include <asm/processor.h> #include <linux/kasan.h> +#include <trace/events/ipi.h> + static DEFINE_PER_CPU(struct llist_head, raised_list); static DEFINE_PER_CPU(struct llist_head, lazy_list); static DEFINE_PER_CPU(struct task_struct *, irq_workd);
@@ -74,6 +76,14 @@ void __weak arch_irq_work_raise(void) */ } +static inline void irq_work_raise(void) +{ + if (arch_irq_work_has_interrupt()) + trace_ipi_send_cpu(_RET_IP_, smp_processor_id()); + + arch_irq_work_raise(); +} + /* Enqueue on current CPU, work must already be claimed and preempt disabled */ static void __irq_work_queue_local(struct irq_work *work) {
@@ -99,7 +109,7 @@ static void __irq_work_queue_local(struct irq_work *work) /* If the work is "lazy", handle it from next tick if any */ if (!lazy_work || tick_nohz_tick_stopped()) - arch_irq_work_raise(); + irq_work_raise(); } /* Enqueue the irq work @work on the current CPU */
--
2.31.1