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Kernel+Profiler: Make profiling per-process and without core dumps
This patch merges the profiling functionality in the kernel with the performance events mechanism. A profiler sample is now just another perf event, rather than a dedicated thing. Since perf events were already per-process, this now makes profiling per-process as well. Processes with perf events would already write out a perfcore.PID file to the current directory on death, but since we may want to profile a process and then let it continue running, recorded perf events can now be accessed at any time via /proc/PID/perf_events. This patch also adds information about process memory regions to the perfcore JSON format. This removes the need to supply a core dump to the Profiler app for symbolication, and so the "profiler coredump" mechanism is removed entirely. There's still a hard limit of 4MB worth of perf events per process, so this is by no means a perfect final design, but it's a nice step forward for both simplicity and stability. Fixes #4848 Fixes #4849
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20 changed files with 195 additions and 310 deletions
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@ -96,7 +96,6 @@ set(KERNEL_SOURCES
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PerformanceEventBuffer.cpp
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Process.cpp
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ProcessGroup.cpp
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Profiling.cpp
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Ptrace.cpp
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RTC.cpp
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Random.cpp
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