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 enabled via the trace option func-args (for the function tracer) and
275 funcgraph-args (for the function graph tracer)
285 replace them with a No-Op instruction) on boot up. During
288 image. When this is enabled, functions can be individually
289 enabled, and the functions not enabled will not affect
328 entries and exits. This also can probe multiple functions by one
341 zero is entered, profiling stops. A "functions" file is created in
342 the trace_stat directory; this file shows the list of functions that
348 bool "Trace max stack"
359 stack-trace saved. If this is configured with DYNAMIC_FTRACE
378 bool "Interrupts-off Latency Tracer"
388 This option measures the time spent in irqs-off critical
392 disabled by default and can be runtime (re-)started
398 enabled. This option and the preempt-off timing option can be
402 bool "Preemption-off Latency Tracer"
412 This option measures the time spent in preemption-off critical
416 disabled by default and can be runtime (re-)started
422 enabled. This option and the irqs-off timing option can be
451 hwlat_detector/width - time in usecs for how long to spin for
452 hwlat_detector/window - time in usecs between the start of each
457 for "window - width" microseconds, where the system can
476 In the context of high-performance computing (HPC), the Operating
480 can cause noise to the system. Moreover, hardware-related jobs can
487 increasing a per-cpu interference counter. It saves an interference
492 hardware noise counter increases, pointing to a hardware-related
495 the sum of all noise, the max single noise, the percentage of CPU
512 to find sources of wakeup latencies of real-time threads.
514 The tracer creates a per-cpu kernel thread with real-time priority.
542 default and can be enabled at run-time.
609 The "all branch" profiler will profile every if-statement in the
702 bool "Enable fprobe-based dynamic events"
728 bool "Enable kprobes-based dynamic events"
741 This option is also required by perf-probe subcommand of perf tools.
754 functions are protected from kprobe-events to prevent an infinite
759 events on ftrace functions for debugging ftrace by itself.
765 bool "Enable uprobes-based dynamic events"
779 This option is required if you plan to use perf-probe subcommand
817 depends on $(cc-option,-mrecord-mcount)
840 tracing_map is a special-purpose lock-free map for tracing,
841 separated out as a stand-alone facility in order to allow it
852 Synthetic events are user-defined trace events that can be
856 by way of an in-kernel API.
868 User trace events are user-defined trace events that
894 Inter-event tracing of quantities such as latencies is also
904 Allow user-space to inject a specific trace event into the ring
931 last=632 first=3672 max=632 min=632 avg=316 std=446 std^2=199712
932 last=278 first=3672 max=632 min=278 avg=303 std=316 std^2=100337
933 last=277 first=3672 max=632 min=277 avg=296 std=258 std^2=67064
934 last=273 first=3672 max=632 min=273 avg=292 std=224 std^2=50411
935 last=273 first=3672 max=632 min=273 avg=288 std=200 std^2=40389
936 last=281 first=3672 max=632 min=273 avg=287 std=183 std^2=33666
984 bool "Record functions that recurse in function tracing"
990 file system called "recursed_functions" that will list the functions
998 int "Max number of recursed functions to record"
1002 This defines the limit of number of functions that can be
1004 the functions that caused a recursion to happen.
1022 bool "Record functions that recurse in the ring buffer"
1040 which functions/lines are tested.
1079 TBD - enable a way to actually call the syscalls as we test their
1083 bool "Verify compile time sorting of ftrace functions"
1088 where the ftrace knows where to patch functions for tracing
1090 is not done correctly, it will cause non-deterministic failures.
1159 irq-disabled critical sections for 500us:
1169 tristate "Test module for in-kernel synthetic event generation"
1173 functionality of in-kernel synthetic event definition and
1182 tristate "Test module for in-kernel kprobe event generation"
1186 functionality of in-kernel kprobe event definition.
1203 - Helps developers verify that nothing is broken.
1205 - Provides educational information to support the details
1207 Documentation/trace/histogram-design.rst.