tracing, genirq: add irq enter and exit trace events
Impact: add new tracepoints Add them to the generic IRQ code, that way every architecture gets these new tracepoints, not just x86. Using Steve's new 'TRACE_FORMAT', I can get function graph trace as follows using the original two IRQ tracepoints: 3) | handle_IRQ_event() { 3) | /* (irq_handler_entry) irq=28 handler=eth0 */ 3) | e1000_intr_msi() { 3) 2.460 us | __napi_schedule(); 3) 9.416 us | } 3) | /* (irq_handler_exit) irq=28 handler=eth0 return=handled */ 3) + 22.935 us | } Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Acked-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Mathieu Desnoyers <compudj@krystal.dyndns.org> Cc: "Frank Ch. Eigler" <fche@redhat.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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include/trace/irq.h
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9
include/trace/irq.h
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@ -0,0 +1,9 @@
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#ifndef _TRACE_IRQ_H
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#define _TRACE_IRQ_H
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#include <linux/interrupt.h>
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#include <linux/tracepoint.h>
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#include <trace/irq_event_types.h>
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#endif
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include/trace/irq_event_types.h
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include/trace/irq_event_types.h
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/* use <trace/irq.h> instead */
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#ifndef TRACE_FORMAT
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# error Do not include this file directly.
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# error Unless you know what you are doing.
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#endif
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TRACE_FORMAT(irq_handler_entry,
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TPPROTO(int irq, struct irqaction *action),
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TPARGS(irq, action),
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TPFMT("irq=%d handler=%s", irq, action->name));
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TRACE_FORMAT(irq_handler_exit,
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TPPROTO(int irq, struct irqaction *action, int ret),
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TPARGS(irq, action, ret),
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TPFMT("irq=%d handler=%s return=%s",
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irq, action->name, ret ? "handled" : "unhandled"));
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@ -17,6 +17,7 @@
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#include <linux/kernel_stat.h>
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#include <linux/rculist.h>
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#include <linux/hash.h>
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#include <trace/irq.h>
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#include "internals.h"
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@ -316,6 +317,9 @@ irqreturn_t no_action(int cpl, void *dev_id)
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return IRQ_NONE;
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}
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DEFINE_TRACE(irq_handler_entry);
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DEFINE_TRACE(irq_handler_exit);
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/**
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* handle_IRQ_event - irq action chain handler
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* @irq: the interrupt number
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@ -332,7 +336,9 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
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local_irq_enable_in_hardirq();
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do {
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trace_irq_handler_entry(irq, action);
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ret = action->handler(irq, action->dev_id);
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trace_irq_handler_exit(irq, action, ret);
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if (ret == IRQ_HANDLED)
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status |= action->flags;
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retval |= ret;
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@ -6,8 +6,10 @@
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/* trace/<type>.h here */
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#include <trace/sched.h>
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#include <trace/irq.h>
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#include "trace_events.h"
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/* trace/<type>_event_types.h here */
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#include <trace/sched_event_types.h>
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#include <trace/irq_event_types.h>
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