Lines Matching +full:max +full:- +full:functions
1 # SPDX-License-Identifier: GPL-2.0-only
21 API, which will be used by other function-entry hooking
27 See Documentation/trace/ftrace-design.rst
32 See Documentation/trace/ftrace-design.rst
37 See Documentation/trace/ftrace-design.rst
63 See Documentation/trace/ftrace-design.rst
68 See Documentation/trace/ftrace-design.rst
73 Arch supports the gcc options -pg with -mfentry
78 Arch supports the gcc options -pg with -mrecord-mcount and -nop-mcount
83 Arch supports objtool --mcount
179 bool "Boot-time Tracing support"
198 by using a compiler feature to insert a small, 5-byte No-Operation
203 small and not measurable even in micro-benchmarks (at least on
215 Its first purpose is to trace the duration of functions and
228 replace them with a No-Op instruction) on boot up. During
231 image. When this is enabled, functions can be individually
232 enabled, and the functions not enabled will not affect
268 entries and exits. This also can probe multiple functions by one
281 zero is entered, profiling stops. A "functions" file is created in
282 the trace_stat directory; this file shows the list of functions that
288 bool "Trace max stack"
299 stack-trace saved. If this is configured with DYNAMIC_FTRACE
318 bool "Interrupts-off Latency Tracer"
328 This option measures the time spent in irqs-off critical
332 disabled by default and can be runtime (re-)started
338 enabled. This option and the preempt-off timing option can be
342 bool "Preemption-off Latency Tracer"
352 This option measures the time spent in preemption-off critical
356 disabled by default and can be runtime (re-)started
362 enabled. This option and the irqs-off timing option can be
390 hwlat_detector/width - time in usecs for how long to spin for
391 hwlat_detector/window - time in usecs between the start of each
396 for "window - width" microseconds, where the system can
414 In the context of high-performance computing (HPC), the Operating
418 can cause noise to the system. Moreover, hardware-related jobs can
425 increasing a per-cpu interference counter. It saves an interference
430 hardware noise counter increases, pointing to a hardware-related
433 the sum of all noise, the max single noise, the percentage of CPU
450 to find sources of wakeup latencies of real-time threads.
452 The tracer creates a per-cpu kernel thread with real-time priority.
480 default and can be enabled at run-time.
547 The "all branch" profiler will profile every if-statement in the
640 bool "Enable kprobes-based dynamic events"
653 This option is also required by perf-probe subcommand of perf tools.
666 functions are protected from kprobe-events to prevent an infinite
671 events on ftrace functions for debugging ftrace by itself.
677 bool "Enable uprobes-based dynamic events"
691 This option is required if you plan to use perf-probe subcommand
729 depends on $(cc-option,-mrecord-mcount)
752 tracing_map is a special-purpose lock-free map for tracing,
753 separated out as a stand-alone facility in order to allow it
764 Synthetic events are user-defined trace events that can be
768 by way of an in-kernel API.
781 User trace events are user-defined trace events that
786 an associated byte being non-zero.
806 Inter-event tracing of quantities such as latencies is also
816 Allow user-space to inject a specific trace event into the ring
843 last=632 first=3672 max=632 min=632 avg=316 std=446 std^2=199712
844 last=278 first=3672 max=632 min=278 avg=303 std=316 std^2=100337
845 last=277 first=3672 max=632 min=277 avg=296 std=258 std^2=67064
846 last=273 first=3672 max=632 min=273 avg=292 std=224 std^2=50411
847 last=273 first=3672 max=632 min=273 avg=288 std=200 std^2=40389
848 last=281 first=3672 max=632 min=273 avg=287 std=183 std^2=33666
896 bool "Record functions that recurse in function tracing"
902 file system called "recursed_functions" that will list the functions
910 int "Max number of recursed functions to record"
914 This defines the limit of number of functions that can be
916 the functions that caused a recursion to happen.
921 bool "Record functions that recurse in the ring buffer"
939 which functions/lines are tested.
978 TBD - enable a way to actually call the syscalls as we test their
982 bool "Verify compile time sorting of ftrace functions"
987 where the ftrace knows where to patch functions for tracing
989 is not done correctly, it will cause non-deterministic failures.
1058 irq-disabled critical sections for 500us:
1068 tristate "Test module for in-kernel synthetic event generation"
1072 functionality of in-kernel synthetic event definition and
1081 tristate "Test module for in-kernel kprobe event generation"
1085 functionality of in-kernel kprobe event definition.
1102 - Helps developers verify that nothing is broken.
1104 - Provides educational information to support the details
1106 Documentation/trace/histogram-design.rst.