![]() To figure out which task it was, then go back to the actual trace toĭecode it) and it completely misses the case when the tracing is enabledĪnd disabled before sched_switch, for example, via PERF_EVENT_IOC_DISABLE. The consumer will need to process events out of order (that is, havingįound RECORD_AUX, it will have to skip forward to the nearest sched_switch ![]() While sched_switch covers for most cases, there are two problems with it: IP-Tracer is a free and open-source tool available on GitHub that was developed for Linux-based distributions such as Kali Linux, Parrot, Termux. Record is that not all pmus capable of generating AUX data need this,Īnd the opposite is *probably* also true. The reason this is not part of RECORD_AUX To single out such instruction tracing pmus, this patch introduces Require program's object code in order to reconstruct said flow andįor that we need at least its pid/tid in the perf stream. The decoder's need to know this stemsįrom the fact that instruction flow trace decoding will almost always Running task, such as instruction tracing, the decoder needs to knowĮxactly which task is running when the event is first scheduled in,īefore the first sched_switch. Messages sorted by: įor counters that generate AUX data that is bound to the context of a.Next in thread: Alexander Shishkin: " x86: perf: intel_pt: Intel PT PMU driver".In reply to: Alexander Shishkin: " x86: perf: intel_bts: Add BTS PMU driver".Previous message: Alexander Shishkin: " x86: perf: intel_bts: Add BTS PMU driver". ![]() Next message: Alexander Shishkin: " x86: perf: intel_pt: Intel PT PMU driver".The single most notable thing is that while PT outputs trace data in a compressed binary format, it will still generate hundreds of megabytes of trace data per second per core. PURge purges (resets) the internal trace table. We provide an abstraction for it called 'itrace' for 'instruction trace' ( 2). Linux-Kernel Archive: perf: add ITRACE_START record to indicate that tracing has started perf: add ITRACE_START record to indicate that tracing has started From: Alexander Shishkin Purpose The ITRACE command modifies the state of the internal RSCS trace table, modifies the types of events RSCS will trace, and turns tracing on and off. ![]()
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