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
86 See Documentation/trace/ftrace-design.rst
91 Arch supports the gcc options -pg with -mfentry
96 Arch supports the gcc options -pg with -mrecord-mcount and -nop-mcount
101 Arch supports objtool --mcount
106 Arch supports the objtool options --mcount with --mnop.
217 bool "Boot-time Tracing support"
236 by using a compiler feature to insert a small, 5-byte No-Operation
241 small and not measurable even in micro-benchmarks (at least on
253 Its first purpose is to trace the duration of functions and
265 using function graph tracer. It can be helpful to locate functions
267 enable it via the trace option funcgraph-retval.
278 enable it via the trace option funcgraph-retaddr.
288 enabled via the trace option func-args (for the function tracer) and
289 funcgraph-args (for the function graph tracer)
299 replace them with a No-Op instruction) on boot up. During
302 image. When this is enabled, functions can be individually
303 enabled, and the functions not enabled will not affect
342 entries and exits. This also can probe multiple functions by one
355 zero is entered, profiling stops. A "functions" file is created in
356 the trace_stat directory; this file shows the list of functions that
362 bool "Trace max stack"
373 stack-trace saved. If this is configured with DYNAMIC_FTRACE
392 bool "Interrupts-off Latency Tracer"
402 This option measures the time spent in irqs-off critical
406 disabled by default and can be runtime (re-)started
412 enabled. This option and the preempt-off timing option can be
416 bool "Preemption-off Latency Tracer"
426 This option measures the time spent in preemption-off critical
430 disabled by default and can be runtime (re-)started
436 enabled. This option and the irqs-off timing option can be
465 hwlat_detector/width - time in usecs for how long to spin for
466 hwlat_detector/window - time in usecs between the start of each
471 for "window - width" microseconds, where the system can
490 In the context of high-performance computing (HPC), the Operating
494 can cause noise to the system. Moreover, hardware-related jobs can
501 increasing a per-cpu interference counter. It saves an interference
506 hardware noise counter increases, pointing to a hardware-related
509 the sum of all noise, the max single noise, the percentage of CPU
526 to find sources of wakeup latencies of real-time threads.
528 The tracer creates a per-cpu kernel thread with real-time priority.
556 default and can be enabled at run-time.
623 The "all branch" profiler will profile every if-statement in the
716 bool "Enable fprobe-based dynamic events"
742 bool "Enable kprobes-based dynamic events"
755 This option is also required by perf-probe subcommand of perf tools.
768 functions are protected from kprobe-events to prevent an infinite
773 events on ftrace functions for debugging ftrace by itself.
779 bool "Enable uprobes-based dynamic events"
793 This option is required if you plan to use perf-probe subcommand
797 bool "Enable event-based dynamic events"
840 depends on $(cc-option,-mrecord-mcount)
863 tracing_map is a special-purpose lock-free map for tracing,
864 separated out as a stand-alone facility in order to allow it
875 Synthetic events are user-defined trace events that can be
879 by way of an in-kernel API.
891 User trace events are user-defined trace events that
917 Inter-event tracing of quantities such as latencies is also
927 Allow user-space to inject a specific trace event into the ring
954 last=632 first=3672 max=632 min=632 avg=316 std=446 std^2=199712
955 last=278 first=3672 max=632 min=278 avg=303 std=316 std^2=100337
956 last=277 first=3672 max=632 min=277 avg=296 std=258 std^2=67064
957 last=273 first=3672 max=632 min=273 avg=292 std=224 std^2=50411
958 last=273 first=3672 max=632 min=273 avg=288 std=200 std^2=40389
959 last=281 first=3672 max=632 min=273 avg=287 std=183 std^2=33666
1007 bool "Record functions that recurse in function tracing"
1013 file system called "recursed_functions" that will list the functions
1021 int "Max number of recursed functions to record"
1025 This defines the limit of number of functions that can be
1027 the functions that caused a recursion to happen.
1045 bool "Record functions that recurse in the ring buffer"
1063 which functions/lines are tested.
1102 TBD - enable a way to actually call the syscalls as we test their
1106 bool "Verify compile time sorting of ftrace functions"
1111 where the ftrace knows where to patch functions for tracing
1113 is not done correctly, it will cause non-deterministic failures.
1182 irq-disabled critical sections for 500us:
1192 tristate "Test module for in-kernel synthetic event generation"
1196 functionality of in-kernel synthetic event definition and
1205 tristate "Test module for in-kernel kprobe event generation"
1209 functionality of in-kernel kprobe event definition.
1226 - Helps developers verify that nothing is broken.
1228 - Provides educational information to support the details
1230 Documentation/trace/histogram-design.rst.