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
45 See Documentation/trace/ftrace-design.rst
80 See Documentation/trace/ftrace-design.rst
85 See Documentation/trace/ftrace-design.rst
90 Arch supports the gcc options -pg with -mfentry
95 Arch supports the gcc options -pg with -mrecord-mcount and -nop-mcount
100 Arch supports objtool --mcount
105 Arch supports the objtool options --mcount with --mnop.
203 bool "Boot-time Tracing support"
222 by using a compiler feature to insert a small, 5-byte No-Operation
227 small and not measurable even in micro-benchmarks (at least on
239 Its first purpose is to trace the duration of functions and
251 using function graph tracer. It can be helpful to locate functions
253 enable it via the trace option funcgraph-retval.
264 enable it via the trace option funcgraph-retaddr.
274 replace them with a No-Op instruction) on boot up. During
277 image. When this is enabled, functions can be individually
278 enabled, and the functions not enabled will not affect
317 entries and exits. This also can probe multiple functions by one
330 zero is entered, profiling stops. A "functions" file is created in
331 the trace_stat directory; this file shows the list of functions that
337 bool "Trace max stack"
348 stack-trace saved. If this is configured with DYNAMIC_FTRACE
367 bool "Interrupts-off Latency Tracer"
377 This option measures the time spent in irqs-off critical
381 disabled by default and can be runtime (re-)started
387 enabled. This option and the preempt-off timing option can be
391 bool "Preemption-off Latency Tracer"
401 This option measures the time spent in preemption-off critical
405 disabled by default and can be runtime (re-)started
411 enabled. This option and the irqs-off timing option can be
440 hwlat_detector/width - time in usecs for how long to spin for
441 hwlat_detector/window - time in usecs between the start of each
446 for "window - width" microseconds, where the system can
465 In the context of high-performance computing (HPC), the Operating
469 can cause noise to the system. Moreover, hardware-related jobs can
476 increasing a per-cpu interference counter. It saves an interference
481 hardware noise counter increases, pointing to a hardware-related
484 the sum of all noise, the max single noise, the percentage of CPU
501 to find sources of wakeup latencies of real-time threads.
503 The tracer creates a per-cpu kernel thread with real-time priority.
531 default and can be enabled at run-time.
598 The "all branch" profiler will profile every if-statement in the
691 bool "Enable fprobe-based dynamic events"
717 bool "Enable kprobes-based dynamic events"
730 This option is also required by perf-probe subcommand of perf tools.
743 functions are protected from kprobe-events to prevent an infinite
748 events on ftrace functions for debugging ftrace by itself.
754 bool "Enable uprobes-based dynamic events"
768 This option is required if you plan to use perf-probe subcommand
806 depends on $(cc-option,-mrecord-mcount)
829 tracing_map is a special-purpose lock-free map for tracing,
830 separated out as a stand-alone facility in order to allow it
841 Synthetic events are user-defined trace events that can be
845 by way of an in-kernel API.
857 User trace events are user-defined trace events that
883 Inter-event tracing of quantities such as latencies is also
893 Allow user-space to inject a specific trace event into the ring
920 last=632 first=3672 max=632 min=632 avg=316 std=446 std^2=199712
921 last=278 first=3672 max=632 min=278 avg=303 std=316 std^2=100337
922 last=277 first=3672 max=632 min=277 avg=296 std=258 std^2=67064
923 last=273 first=3672 max=632 min=273 avg=292 std=224 std^2=50411
924 last=273 first=3672 max=632 min=273 avg=288 std=200 std^2=40389
925 last=281 first=3672 max=632 min=273 avg=287 std=183 std^2=33666
973 bool "Record functions that recurse in function tracing"
979 file system called "recursed_functions" that will list the functions
987 int "Max number of recursed functions to record"
991 This defines the limit of number of functions that can be
993 the functions that caused a recursion to happen.
1011 bool "Record functions that recurse in the ring buffer"
1029 which functions/lines are tested.
1068 TBD - enable a way to actually call the syscalls as we test their
1072 bool "Verify compile time sorting of ftrace functions"
1077 where the ftrace knows where to patch functions for tracing
1079 is not done correctly, it will cause non-deterministic failures.
1148 irq-disabled critical sections for 500us:
1158 tristate "Test module for in-kernel synthetic event generation"
1162 functionality of in-kernel synthetic event definition and
1171 tristate "Test module for in-kernel kprobe event generation"
1175 functionality of in-kernel kprobe event definition.
1192 - Helps developers verify that nothing is broken.
1194 - Provides educational information to support the details
1196 Documentation/trace/histogram-design.rst.