kernel: Enable kprobes and other tracing features

All of these should have minimal performance impact unless enabled at
runtime.

Changed files
+5 -1
pkgs
os-specific
linux
+5 -1
pkgs/os-specific/linux/kernel/common-config.nix
···
NUMA? y
# Disable some expensive (?) features.
-
KPROBES n
PM_TRACE_RTC n
# Enable various subsystems.
···
# Tracing.
FTRACE y
+
KPROBES y
FUNCTION_TRACER y
FTRACE_SYSCALLS y
SCHED_TRACER y
+
STACK_TRACER y
+
UPROBE_EVENT y
+
FUNCTION_PROFILER y
+
RING_BUFFER_BENCHMARK n
# Devtmpfs support.
DEVTMPFS y