| Subject | Re: [PATCH 21/21] tracing: Add optional percpu buffers for trace_printk() | From | Peter Zijlstra <> | Date | Fri, 23 Sep 2011 13:02:02 +0200 |
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On Thu, 2011-09-22 at 18:09 -0400, Steven Rostedt wrote: > > Currently, trace_printk() uses a single buffer to write into > to calculate the size and format needed to save the trace. To > do this safely in an SMP environment, a spin_lock() is taken > to only allow one writer at a time to the buffer. But this could > also affect what is being traced, and add synchronization that > would not be there otherwise.
so trace_printk() isn't NMI safe? #$%@^%@@$%@
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