* [PATCH] clocksource/imx: allow timer irq affinity change
@ 2015-10-14 9:24 Lucas Stach
2015-10-15 15:40 ` Daniel Lezcano
0 siblings, 1 reply; 2+ messages in thread
From: Lucas Stach @ 2015-10-14 9:24 UTC (permalink / raw
To: Daniel Lezcano, Thomas Gleixner
Cc: Shawn Guo, kernel, patchwork-lst, linux-kernel
Allow the timer core to change the smp affinity of the broadcast timer
irq by setting CLOCK_EVT_FEAT_DYNIRQ flag. For this to work the timer
core needs to be told about the used irq.
This reduces interrupt pressure and wakeups on CPU0 as well as vastly
reducing the number of timer broadcast IPIs.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
---
drivers/clocksource/timer-imx-gpt.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/clocksource/timer-imx-gpt.c b/drivers/clocksource/timer-imx-gpt.c
index 839aba92fc39..99ec96769dda 100644
--- a/drivers/clocksource/timer-imx-gpt.c
+++ b/drivers/clocksource/timer-imx-gpt.c
@@ -305,13 +305,14 @@ static int __init mxc_clockevent_init(struct imx_timer *imxtm)
struct irqaction *act = &imxtm->act;
ced->name = "mxc_timer1";
- ced->features = CLOCK_EVT_FEAT_ONESHOT;
+ ced->features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_DYNIRQ;
ced->set_state_shutdown = mxc_shutdown;
ced->set_state_oneshot = mxc_set_oneshot;
ced->tick_resume = mxc_shutdown;
ced->set_next_event = imxtm->gpt->set_next_event;
ced->rating = 200;
ced->cpumask = cpumask_of(0);
+ ced->irq = imxtm->irq;
clockevents_config_and_register(ced, clk_get_rate(imxtm->clk_per),
0xff, 0xfffffffe);
--
2.6.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] clocksource/imx: allow timer irq affinity change
2015-10-14 9:24 [PATCH] clocksource/imx: allow timer irq affinity change Lucas Stach
@ 2015-10-15 15:40 ` Daniel Lezcano
0 siblings, 0 replies; 2+ messages in thread
From: Daniel Lezcano @ 2015-10-15 15:40 UTC (permalink / raw
To: Lucas Stach, Thomas Gleixner
Cc: Shawn Guo, kernel, patchwork-lst, linux-kernel
On 10/14/2015 11:24 AM, Lucas Stach wrote:
> Allow the timer core to change the smp affinity of the broadcast timer
> irq by setting CLOCK_EVT_FEAT_DYNIRQ flag. For this to work the timer
> core needs to be told about the used irq.
>
> This reduces interrupt pressure and wakeups on CPU0 as well as vastly
> reducing the number of timer broadcast IPIs.
>
> Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
> ---
Applied on my tree for 4.4
Thanks !
-- Daniel
--
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2015-10-15 15:40 ` Daniel Lezcano
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