lkml.org 
[lkml]   [2022]   [Dec]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v3 5/8] irq_work: Trace self-IPIs sent via arch_irq_work_raise()
Date
IPIs sent to remote CPUs via irq_work_queue_on() are now covered by
trace_ipi_send_cpumask(), add another instance of the tracepoint to cover
self-IPIs.

Signed-off-by: Valentin Schneider <vschneid@redhat.com>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
---
kernel/irq_work.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/kernel/irq_work.c b/kernel/irq_work.c
index 7afa40fe5cc43..c33e88e32a67a 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 +76,16 @@ void __weak arch_irq_work_raise(void)
*/
}

+static __always_inline void irq_work_raise(struct irq_work *work)
+{
+ if (trace_ipi_send_cpumask_enabled() && arch_irq_work_has_interrupt())
+ trace_ipi_send_cpumask(cpumask_of(smp_processor_id()),
+ _RET_IP_,
+ work->func);
+
+ 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 +111,7 @@ 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(work);
}

/* Enqueue the irq work @work on the current CPU */
--
2.31.1
\
 
 \ /
  Last update: 2022-12-02 17:02    [W:0.284 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site