Re: [patch] latency tracer, 2.6.15-rc7

On Thu, Dec 29, 2005 at 09:22:17AM +0100, Ingo Molnar wrote:
>
> * Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
>
> > I'm not sure how much work it would be to break out
> > CONFIG_LATENCY_TRACE as a separate patch.
>
> could you check out the 2.6.15-rc7 version of the latency tracer i
> uploaded to:
>
> http://redhat.com/~mingo/latency-tracing-patches/
>
> could test it by e.g. trying to reproduce the same VM latency as in the
> -rt tree. [the two zlib patches are needed if you are using 4K stacks,
> mcount increases stack footprint.]

kernel/latency.c: In function 'add_preempt_count_ti':
kernel/latency.c:1703: warning: implicit declaration of function 'preempt_count_ti'
kernel/latency.c:1703: error: invalid lvalue in assignment
kernel/latency.c: In function 'sub_preempt_count_ti':
kernel/latency.c:1764: error: invalid lvalue in assignment

interesting config options ...

# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
CONFIG_PREEMPT_BKL=y

CONFIG_WAKEUP_TIMING=y
CONFIG_WAKEUP_LATENCY_HIST=y
CONFIG_CRITICAL_IRQSOFF_TIMING=y
CONFIG_INTERRUPT_OFF_HIST=y
CONFIG_LATENCY_TRACE=y
CONFIG_USE_FRAME_POINTER=y
CONFIG_FRAME_POINTER=y

Dave

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