kevin/linux
1
Fork 0
Code

irq_work: Trace self-IPIs sent via arch_irq_work_raise()

Browse Source 
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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/r/20230307143558.294354-5-vschneid@redhat.com
This commit is contained in:
Valentin Schneider 2023-03-07 14:35:55 +00:00 committed by Peter Zijlstra
parent 08407b5f61
commit 4468161a5c
1 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
kernel/irq_work.c
View File

@ -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 */