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Commit a42c3629 authored by Russell King's avatar Russell King
Browse files

ARM: Add irqtime accounting support 



Add support for irq time accounting.  This commit prepares ARM by adding
the call to enable_sched_clock_irqtime() in sched_clock().  We introduce
a new kernel parameter - irqtime - which takes an integer.  -1 for auto,
0 for disabled, and 1 for enabled.  Auto mode selects IRQ accounting if
we have a sched_clock() tick rate greater than 1MHz.

Frederic Weisbecker is working on a patch set which moves the
IRQ_TIME_ACCOUNTING into arch/, so that part is not incorporated into
this patch; this facility becomes available on ARM only when both this
patch and Frederic's patches are merged.

Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent a67e1ce1

arch/arm/kernel/sched_clock.c

+8 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
#include <linux/init.h>

#include <linux/jiffies.h>

#include <linux/kernel.h>

#include <linux/moduleparam.h>

#include <linux/sched.h>

#include <linux/syscore_ops.h>

#include <linux/timer.h>
@@ -25,6 +26,9 @@ struct clock_data { 


static void sched_clock_poll(unsigned long wrap_ticks);

static DEFINE_TIMER(sched_clock_timer, sched_clock_poll, 0, 0);

static int irqtime = -1;



core_param(irqtime, irqtime, int, 0400);



static struct clock_data cd = {

	.mult	= NSEC_PER_SEC / HZ,
@@ -145,6 +149,10 @@ void __init setup_sched_clock(u32 (*read)(void), int bits, unsigned long rate) 
	 */

	cd.epoch_ns = 0;



	/* Enable IRQ time accounting if we have a fast enough sched_clock */

	if (irqtime > 0 || (irqtime == -1 && rate >= 1000000))

		enable_sched_clock_irqtime();



	pr_debug("Registered %pF as sched_clock source\n", read);

}