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| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-09-09 18:39:28 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2012-09-15 21:43:31 +0100 |
| commit | a42c362980430be74b77ec8f374964f61062379f (patch) | |
| tree | f49ca2d6f045d49e4cd659a9f8cedb5824481676 /arch/arm/kernel | |
| parent | a67e1ce145785d884b29b17e4d82a6ecd67bb97a (diff) | |
| download | kernel_goldelico_gta04-a42c362980430be74b77ec8f374964f61062379f.zip kernel_goldelico_gta04-a42c362980430be74b77ec8f374964f61062379f.tar.gz kernel_goldelico_gta04-a42c362980430be74b77ec8f374964f61062379f.tar.bz2 | |
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')
| -rw-r--r-- | arch/arm/kernel/sched_clock.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/arm/kernel/sched_clock.c b/arch/arm/kernel/sched_clock.c index 27d186a..9b8451a 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); } |