16 Sep, 2009

1 commit

• 6ca6cca31   tracing: optimize global_trace_clock cachelines ... Browse Code »

  The prev_trace_clock_time is only read or written to when the
  trace_clock_lock is taken. For better perfomance, they
  should share the same cache line.

  Reported-by: Peter Zijlstra
  Signed-off-by: Steven Rostedt

  Steven Rostedt

  2009-09-16 00:24:22 +0800  

23 Mar, 2009

1 commit

• b8b942653   tracing: fix four sparse warnings ... Browse Code »

  Impact: cleanup.

  This patch fixes the following sparse warnings:

  kernel/trace/trace.c:385:9: warning: symbol 'trace_seq_to_buffer' was
  not declared. Should it be static?

  kernel/trace/trace_clock.c:29:13: warning: symbol 'trace_clock_local'
  was not declared. Should it be static?

  kernel/trace/trace_clock.c:54:13: warning: symbol 'trace_clock' was not
  declared. Should it be static?

  kernel/trace/trace_clock.c:74:13: warning: symbol 'trace_clock_global'
  was not declared. Should it be static?

  Signed-off-by: Dmitri Vorobiev
  LKML-Reference:
  Signed-off-by: Ingo Molnar

  Dmitri Vorobiev

  2009-03-23 01:16:54 +0800  

11 Mar, 2009

1 commit

• 6cc3c6e12   trace_clock: fix preemption bug ... Browse Code »

  Using the function_graph tracer in recent kernels generates a spew of
  preemption BUGs. Fix this by not requiring trace_clock_local() users
  to disable preemption themselves.

  Signed-off-by: Peter Zijlstra
  Cc: Steven Rostedt
  Cc: Frederic Weisbecker
  Signed-off-by: Ingo Molnar

  Peter Zijlstra

  2009-03-11 03:03:01 +0800  

27 Feb, 2009

1 commit

• 14131f2f9   tracing: implement trace_clock_*() APIs ... Browse Code »

  Impact: implement new tracing timestamp APIs

  Add three trace clock variants, with differing scalability/precision
  tradeoffs:

  - local: CPU-local trace clock
  - medium: scalable global clock with some jitter
  - global: globally monotonic, serialized clock

  Make the ring-buffer use the local trace clock internally.

  Acked-by: Peter Zijlstra
  Acked-by: Steven Rostedt
  Signed-off-by: Ingo Molnar

  Ingo Molnar

  2009-02-27 01:44:06 +0800