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PR 2922
* time.c (_stp_init_time): call cpufreq_get for each cpu from
a non-atomic context (module init time).
* time.c (__stp_init_time): remove call to cpufreq_get from IPI.
* time.c (__stp_time_timer_callback): disable IRQ's to avoid
perturbations in measurements.
* time.c (_stp_gettimeofday_us): disable preemption to avoid CPU
swaps while we're computing the time.
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* time.c: Do cpufreq notification only if CONFIG_CPU_FREQ defined.
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runtime/
* time.c: Time-estimation with minimal dependency on xtime.
runtime/transport/
* transport/transport.c (_stp_handle_start): Initialize timer functions.
* transport.c (_stp_cleanup_and_exit): Teardown timer functions.
tapset/
* timestamp.stp (gettimeofday_us, gettimeofday_ms, gettimeofday_s):
Convert to using the runtime-provided _stp_gettimeofday_us().
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