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The Linux kernel configuration item CONFIG_PROFILE_ALL_BRANCHES
:
! CONFIG_FORTIFY_SOURCE
This tracer profiles all branch conditions. Every if () taken in the kernel is recorded whether it hit or miss. The results will be displayed in:
/sys/kernel/tracing/trace_stat/branch_all
This option also enables the likely/unlikely profiler.
This configuration, when enabled, will impose a great overhead on the system. This should only be enabled when the system is to be analyzed in much detail.
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