i've released the latency-tracer patch for v2.6.16:
http://redhat.com/~mingo/latency-tracing-patches/latency-tracing-v2.6.16.patch
max scheduling latencies can be tracked via the enabling of
CONFIG_WAKEUP_TIMING. Tracking can be started via the resetting of the
max latency:
echo 0 > /proc/sys/kernel/preempt_max_latency
if CONFIG_LATENCY_TRACE is enabled too then an execution trace will be
automatically generated as well, accessible via /proc/latency_trace.
if CONFIG_DEBUG_STACKOVERFLOW is enabled too then the function tracer
will also track the maximum stack-footprint observed in the system, on a
per-function-call basis. New maximums are reported to the syslog
immediately. (which can be quite verbose during bootup.)
(the latency-tracer has numerous other features as well, such as
userspace-triggered kernel-tracing, irq-triggered tracing, max
preempt-off or irq-off tracing, trace-to-console-via-early-printk for
the debugging of early bootup crashes, print-trace-at-crash, and more.
See past postings and the code for details.)
Ingo
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