A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 19:21:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

tracing, genirq: add irq enter and exit trace events

Browse source 
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 <[email protected]>
Signed-off-by: Steven Rostedt <[email protected]>
Acked-by: Peter Zijlstra <[email protected]>
Acked-by: Masami Hiramatsu <[email protected]>
Cc: KOSAKI Motohiro <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: "Frank Ch. Eigler" <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Jason Baron 2009-02-26 10:11:05 -05:00 • committed by Ingo Molnar
commit af39241b90
4 changed files with 34 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

6
kernel/irq/handle.c
View file

@ -17,6 +17,7 @@
#include <linux/kernel_stat.h>
#include <linux/rculist.h>
#include <linux/hash.h>
#include <trace/irq.h>
#include "internals.h"
@ -316,6 +317,9 @@ irqreturn_t no_action(int cpl, void *dev_id)
return IRQ_NONE;
}
DEFINE_TRACE(irq_handler_entry);
DEFINE_TRACE(irq_handler_exit);
/**
* handle_IRQ_event - irq action chain handler
* @irq: the interrupt number
@ -332,7 +336,9 @@ irqreturn_t handle_IRQ_event(unsigned int irq, struct irqaction *action)
local_irq_enable_in_hardirq();
do {
trace_irq_handler_entry(irq, action);
ret = action->handler(irq, action->dev_id);
trace_irq_handler_exit(irq, action, ret);
if (ret == IRQ_HANDLED)
status |= action->flags;
retval |= ret;