Re: [2.6.30-rcX] Some ftrace debug option is consuming memory?
From: Tetsuo Handa
Date: Tue May 26 2009 - 23:06:45 EST
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
< # Mon May 25 13:28:39 2009
> # Wed May 27 11:52:49 2009
> # CONFIG_TRACE_BRANCH_PROFILING is not set
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