Messages in this thread | | | Date | Wed, 13 Aug 2014 08:51:41 +0300 | From | Adrian Hunter <> | Subject | Re: [PATCH 3/4] perf tools: Fix probing the kernel API with cpu-wide events |
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On 08/13/2014 08:37 AM, Namhyung Kim wrote: > On Tue, 12 Aug 2014 18:04:30 +0300, Adrian Hunter wrote: >> Fall back to probing with the current pid if cpu-wide >> probing fails. This primarily affects the setting of >> comm_exec flag when the user is un-privileged and >> /proc/sys/kernel/perf_event_paranoid > 0. The change >> to comm_exec can be observed by using -vv with >> perf record and a kernel that supports comm_exec. > > Maybe I'm missing something - why not just try process-wide probing in > the first place?
Same reason as patch 4 i.e. to avoid a jump label change when doing system-wide tracing.
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