Messages in this thread | | | Date | Tue, 30 Jun 2009 12:54:18 +0200 | From | Frederic Weisbecker <> | Subject | Re: [QUESTION] trace_function_graph: consumed event may be invalid |
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On Tue, Jun 30, 2009 at 04:14:36PM +0800, Lai Jiangshan wrote: > > In get_return_for_leaf() { > ...... > ring_buffer_consume() > ...... > access to @curr->ent.pid > } > > @curr is saved at consumed event, if this event is the last event > in the page, the ring_buffer may reuse the page. It will become invalid.
Indeed!
> Is there any other code to ensure it valid when we `cat trace_pipe`? > > Lai.
The only solution I see is to do a copy of the entry before consuming it. I'll try that, thanks for your report!
Frederic.
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