help
Basic tracer to catch the syscall entry and exit events.
-config BOOT_TRACER
- bool "Trace boot initcalls"
- select GENERIC_TRACER
- select CONTEXT_SWITCH_TRACER
- help
- This tracer helps developers to optimize boot times: it records
- the timings of the initcalls and traces key events and the identity
- of tasks that can cause boot delays, such as context-switches.
-
- Its aim is to be parsed by the scripts/bootgraph.pl tool to
- produce pretty graphics about boot inefficiencies, giving a visual
- representation of the delays during initcalls - but the raw
- /debug/tracing/trace text output is readable too.
-
- You must pass in initcall_debug and ftrace=initcall to the kernel
- command line to enable this on bootup.
-
config TRACE_BRANCH_PROFILING
bool
select GENERIC_TRACER
Say N if unsure.
-config KSYM_TRACER
- bool "Trace read and write access on kernel memory locations"
- depends on HAVE_HW_BREAKPOINT
- select TRACING
- help
- This tracer helps find read and write operations on any given kernel
- symbol i.e. /proc/kallsyms.
-
-config PROFILE_KSYM_TRACER
- bool "Profile all kernel memory accesses on 'watched' variables"
- depends on KSYM_TRACER
- help
- This tracer profiles kernel accesses on variables watched through the
- ksym tracer ftrace plugin. Depending upon the hardware, all read
- and write operations on kernel variables can be monitored for
- accesses.
-
- The results will be displayed in:
- /debugfs/tracing/profile_ksym
-
- Say N if unsure.
-
config STACK_TRACER
bool "Trace max stack"
depends on HAVE_FUNCTION_TRACER
Say N if unsure.
-config KMEMTRACE
- bool "Trace SLAB allocations"
- select GENERIC_TRACER
- help
- kmemtrace provides tracing for slab allocator functions, such as
- kmalloc, kfree, kmem_cache_alloc, kmem_cache_free, etc. Collected
- data is then fed to the userspace application in order to analyse
- allocation hotspots, internal fragmentation and so on, making it
- possible to see how well an allocator performs, as well as debug
- and profile kernel code.
-
- This requires an userspace application to use. See
- Documentation/trace/kmemtrace.txt for more information.
-
- Saying Y will make the kernel somewhat larger and slower. However,
- if you disable kmemtrace at run-time or boot-time, the performance
- impact is minimal (depending on the arch the kernel is built for).
-
- If unsure, say N.
-
config WORKQUEUE_TRACER
bool "Trace workqueues"
select GENERIC_TRACER