Re: [PATCH 02/27] perf tools: Fix jump label always changing during tracing

[Peter Zijlstra]

On Fri, Jul 25, 2014 at 12:36:44PM -0300, Arnaldo Carvalho de Melo wrote:
> From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> 
> Intel PT decoding walks the object code to reconstruct the trace.  A
> jump label change during tracing causes decoding errors.
> 
> The "Enable close-on-exec flag on perf file descriptor" patch caused
> there to be always a jump label change.
> 
> It was found that using a per-cpu context instead of a per-thread
> context for the probe of the close-on-exec feature, made the problem go
> away.

per-cpu events are privileged, wouldn't this change make CLOEXEC always
undetected for normal users?

Also, the $subject doesn't related to CLOEXEC at all.

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