It is primarily used to implement A tracee first needs to be attached to the tracer. 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 The ptrace() system call provides a means by which one process (the 'tracer') may observe and control the execution of another process (the 'tracee'), and examine and change the tracee's memory and registers. While sched_switch covers for most cases, there are two problems with it: 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
#ITRACE LINUX PATCH#
To single out such instruction tracing pmus, this patch introduces
#ITRACE LINUX CODE#
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" auxtrace.h - tools/perf/util/auxtrace.h - Linux source code (v5.18) - Bootlin Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries.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" A dash (-) will be the barrier between a command and the explanation for a command.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
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