Hi Thomas, this pull request contains the next irq prediction as posted for V11 [1] which takes into account all the commments. It is based on top of irq/core.
As previously discussed the code is not enabled by default, hence compiled out. The first patch adds the IRQF_TIMER flag to the timers which are percpu in order to discard any timing measurement when the interrupt is coming from a timer. All the timers changes have been discarded from V10. The second patch adds a circular buffer and the small routine to store the local time when an interrupt occurs. The t-uple <irq,timestamp> are encoded together into a single 64bits as suggested by Nicolas Pitre. The third patch provides the mathematic to compute the regular intervals. The rational is in changelog and the math is commented in details in the code. Thanks. -- Daniel The following changes since commit b50fb7c99217922ea36d6e38bae34d84c0587cad: Merge branch 'linus' into irq/core (2017-06-20 22:08:32 +0200) are available in the git repository at: http://git.linaro.org/people/daniel.lezcano/linux.git next-irq/4.13-v11 for you to fetch changes up to eacb5f29a1ec71ee3e43e2729b8a1b5ec51320d5: irq: Compute the periodic interval for interrupts (2017-06-20 23:14:18 +0200) ---------------------------------------------------------------- Daniel Lezcano (3): irq: Allow to pass the IRQF_TIMER flag with percpu irq request irq: Track the interrupt timings irq: Compute the periodic interval for interrupts include/linux/interrupt.h | 17 +++++++- kernel/irq/Kconfig | 3 ++ kernel/irq/Makefile | 1 + kernel/irq/handle.c | 2 + kernel/irq/internals.h | 103 +++++++++++++++++++++++++++++++++++++++++++++ kernel/irq/manage.c | 18 +++++--- kernel/irq/timings.c | 366 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 7 files changed, 504 insertions(+), 6 deletions(-) create mode 100644 kernel/irq/timings.c -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
