Sounds good. I'll keep an eye out for your patch set and try it on my
boards as well. CC me if you can.
-- Haris
On 07/13/2018 07:01 AM, Anna-Maria Gleixner wrote:
Hi Haris,
On Thu, 28 Jun 2018, Haris Okanovic wrote:
Collect expired timers in interrupt context to avoid overhead of waking
ktimersoftd on every scheduler tick.
This is implemented by storing lists of expired timers in the timer_base
struct, which is updated by the interrupt routing on each tick in
run_local_timers(). TIMER softirq (ktimersoftd) is then raised only when
one or more expired timers are collected.
Performance impact on a 2core Intel Atom E3825 system:
* reduction in small latency spikes measured by cyclictest
* ~30% fewer context-switches measured by perf
* run_local_timers() execution time increases by 0.2 measured by TSC
I'm also working on timer improvements at the moment. When I fixed all
my bugs in my implementation (there is a last horrible one), I'm very
interested in integrating your patches into my testing to be able to
give you a tested-by.
Thanks,
Anna-Maria
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