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authorRussell King <rmk+kernel@arm.linux.org.uk>2012-09-09 18:39:28 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-09-15 21:43:31 +0100
commita42c362980430be74b77ec8f374964f61062379f (patch)
treef49ca2d6f045d49e4cd659a9f8cedb5824481676 /arch/arm/kernel/sched_clock.c
parenta67e1ce145785d884b29b17e4d82a6ecd67bb97a (diff)
downloadlinux-a42c362980430be74b77ec8f374964f61062379f.tar.gz
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: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/sched_clock.c')
-rw-r--r--arch/arm/kernel/sched_clock.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c
index 27d186abbc06..9b8451a4330f 100644
--- a/arch/arm/kernel/sched_clock.c
+++ b/arch/arm/kernel/sched_clock.c
@@ -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);
 }