[Xenomai-core] Re: [PATCH] latency tracer update

[Philippe Gerum <rpm@xenomai.org>]

Jan Kiszka wrote:
> Hi again,
> 
> here comes the first update of the new latency tracer.
> 
>  arch/i386/kernel/entry.S      |   27 +++
>  arch/i386/kernel/ipipe-root.c |    4
>  include/asm-i386/system.h     |   70 +++++++++
>  include/linux/ipipe_trace.h   |    3
>  kernel/ipipe/Kconfig          |   18 ++
>  kernel/ipipe/tracer.c         |  247 +++++++++++++++++++++++-----------
>  6 files changed, 288 insertions(+), 81 deletions(-)
> 
> The list of changes:
> 
>  o save ipipe_trace_freeze() (and only this function!) from NMI context
>  o CONFIG_IPIPE_TRACE_IRQSOFF instrumentation traces the longest
>    hard-IRQs-off phase of the system (regarding limitations see my
>    earlier posting today)
>  o fixed subtle trace mess-up
>  o added some "unlikely" to the tracer's hotpath
>  o added ipipe_trace_{max|frozen}_reset() to the API
> 
> To-do
>  o fix leaking IRQs-off trace
>  o documentation...
> 
> Philippe, I think this should already be merged into Adeos although
> TRACE_IRQSOFF is not perfect yet.
> 

Ok, it's queued for review. I'm busy right now integrating Dmitry's 
shared IRQ infrastructure into all supported archs and revalidating Xeno 
with the shortened interrupt path; once that's done and a first round of 
patches is rolled out, a second one will follow for x86 with the tracer 
fixes.

-- 

Philippe.