Re: [2.6.30-rcX] Some ftrace debug option is consuming memory?

[Tetsuo Handa]

Hello.

Steven Rostedt wrote:
> I should have noticed this before. I bet if you disable the branch tracers 
> you will boot again. The branch tracers makes a table of _all_ branches in 
> the kernel. But the change we did between 29 and 30 is that we also make 
> it per cpu. On big boxes the cache line hits were so bad that the 
> interrupts would take so long that they would live lock the machine.
> 
> You configured 2 CPUS so you doubled the size of that table.
> 
> To test if this is your issue you can try changing NR_CPUS to 1, or just 
> disabled the BRANCH_PROFILERs.

I disabled CONFIG_TRACE_BRANCH_PROFILING and it boots now.

  # diff config-2.6.30-rc7-ng .config
  4c4
  < # Mon May 25 13:28:39 2009
  ---
  > # Wed May 27 11:52:49 2009
  1546,1549c1546
  < CONFIG_TRACE_BRANCH_PROFILING=y
  < CONFIG_PROFILE_ALL_BRANCHES=y
  < CONFIG_TRACING_BRANCHES=y
  < CONFIG_BRANCH_TRACER=y
  ---
  > # CONFIG_TRACE_BRANCH_PROFILING is not set

Thank you.
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