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From:   Valentin Schneider <vschneid@redhat.com>
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Cc:     "Paul E. McKenney" <paulmck@kernel.org>,
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        Russell King <linux@armlinux.org.uk>,
        Nicholas Piggin <npiggin@gmail.com>,
        Guo Ren <guoren@kernel.org>,
        "David S. Miller" <davem@davemloft.net>
Subject: [RFC PATCH 4/5] irq_work: Trace calls to arch_irq_work_raise()
Date:   Fri,  7 Oct 2022 16:45:32 +0100
Message-Id: <20221007154533.1878285-4-vschneid@redhat.com>
In-Reply-To: <20221007154145.1877054-1-vschneid@redhat.com>
References: <20221007154145.1877054-1-vschneid@redhat.com>
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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