| /linux-6.14.4/Documentation/trace/ |
| D | boottime-trace.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 Boot-time tracing
12 Boot-time tracing allows users to trace boot-time process including
13 device initialization with full features of ftrace including per-event
14 filter and actions, histograms, kprobe-events and synthetic-events,
23 boot config file [1]_. All options are under "ftrace." or "kernel."
27 .. [1] See :ref:`Documentation/admin-guide/bootconfig.rst <bootconfig>`
28 .. [2] See :ref:`Documentation/admin-guide/kernel-parameters.rst <kernelparameters>`
30 Ftrace Global Options
31 ---------------------
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| D | fprobe.rst | 1 .. SPDX-License-Identifier: GPL-2.0
4 Fprobe - Function entry/exit probe
12 Fprobe is a function entry/exit probe based on the function-graph tracing
13 feature in ftrace.
23 The fprobe is a wrapper of ftrace (+ kretprobe-like return callback) to
30 .. code-block:: c
41 The register_fprobe() enables a fprobe by function-name filters.
46 The register_fprobe_ips() enables a fprobe by ftrace-location addresses.
49 .. code-block:: c
58 .. code-block:: c
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| D | ftrace-design.rst | 12 ------------
20 ftrace.txt file.
23 their kernel should make it all the way to dynamic ftrace support.
27 -------------
29 Ftrace relies on these features being implemented:
30 - STACKTRACE_SUPPORT - implement save_stack_trace()
31 - TRACE_IRQFLAGS_SUPPORT - implement include/asm/irqflags.h
35 --------------------
43 $ echo 'main(){}' | gcc -x c -S -o - - -pg | grep mcount
56 be (semi-)relevant.
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| D | ftrace.rst | 2 ftrace - Function Tracer
13 - Written for: 2.6.28-rc2
14 - Updated for: 3.10
15 - Updated for: 4.13 - Copyright 2017 VMware Inc. Steven Rostedt
16 - Converted to rst format - Changbin Du <[email protected]>
19 ------------
21 Ftrace is an internal tracer designed to help out developers and
24 performance issues that take place outside of user-space.
26 Although ftrace is typically considered the function tracer, it
32 One of the most common uses of ftrace is the event tracing.
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| D | user_events.rst | 2 user_events: User-based Event Tracing
8 --------
10 that can be viewed via existing tools, such as ftrace and perf.
20 requires CAP_PERFMON due to the event persisting, otherwise -EPERM is returned.
23 tools that can read trace_events (such as ftrace and perf). The registration
36 -----------
44 /* Input: Size of the user_reg structure being used */
45 __u32 size;
50 /* Input: Enable size in bytes at address */
68 + size: This must be set to sizeof(struct user_reg).
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| /linux-6.14.4/tools/perf/ |
| D | builtin-ftrace.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * builtin-ftrace.c
25 #include <subcmd/parse-options.h>
36 #include "util/ftrace.h"
39 #include "util/parse-sublevel-options.h"
64 workload_exec_errno = info->si_value.sival_int; in ftrace__workload_exec_failed_signal()
78 pr_err("ftrace only works for %s!\n", in check_ftrace_capable()
106 int fd, ret = -1; in __write_tracing_file()
107 ssize_t size = strlen(val); in __write_tracing_file() local
115 return -1; in __write_tracing_file()
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| /linux-6.14.4/tools/perf/Documentation/ |
| D | perf-ftrace.txt | 1 perf-ftrace(1)
5 ----
6 perf-ftrace - simple wrapper for kernel's ftrace functionality
10 --------
12 'perf ftrace' {trace|latency|profile} <command>
15 -----------
16 The 'perf ftrace' command provides a collection of subcommands which use
17 kernel's ftrace infrastructure.
19 'perf ftrace trace' is a simple wrapper of the ftrace. It only supports
23 'perf ftrace latency' calculates execution latency of a given function
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| /linux-6.14.4/tools/bootconfig/scripts/ |
| D | bconf2ftrace.sh | 2 # SPDX-License-Identifier: GPL-2.0-only
5 echo "Ftrace boottime trace test tool"
6 echo "Usage: $0 [--apply|--init] [--debug] BOOTCONFIG-FILE"
7 echo " --apply: Test actual apply to tracefs (need sudo)"
8 echo " --init: Initialize ftrace before applying (imply --apply)"
12 [ $# -eq 0 ] && usage
20 "--debug")
22 "--apply")
24 "--init")
28 [ ! -f $1 ] && usage
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| /linux-6.14.4/tools/power/pm-graph/ |
| D | sleepgraph.8 | 3 sleepgraph \- Suspend/Resume timing analysis
13 suspend and capture dmesg and ftrace data until resume is complete.
21 Generates output files in subdirectory: suspend-yymmdd-HHMMSS
24 raw ftrace file : <hostname>_<mode>_ftrace.txt
27 \fB-h\fR
30 \fB-v\fR
33 \fB-verbose\fR
36 \fB-config \fIfile\fR
39 \fB-m \fImode\fR
42 \fB-o \fIname\fR
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| D | bootgraph.8 | 3 bootgraph \- Kernel boot timing analysis
21 The tool can also augment the timeline with ftrace data on custom target
24 Generates output files in subdirectory: boot-yymmdd-HHMMSS
27 raw ftrace file : <hostname>_boot_ftrace.txt
30 \fB-h\fR
33 \fB-v\fR
36 \fB-addlogs\fR
40 \fB-result \fIfile\fR
43 \fB-o \fIname\fR
47 e.g. boot-{hostname}-{date}-{time}
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| /linux-6.14.4/kernel/trace/ |
| D | fprobe.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * fprobe - Simple ftrace probe wrapper for function entry.
26 #define SIZE_IN_LONG(x) ((x + sizeof(long) - 1) >> (sizeof(long) == 8 ? 3 : 2))
32 * instance related to the funciton address. The key is the ftrace IP
40 * - Normal hlist traversal and RCU add/del under 'fprobe_mutex' is held.
41 * - RCU hlist traversal under disabling preempt
49 * probe, once for correcting the total required size, the second time is
62 if (node->addr == ip) in find_first_fprobe_node()
72 unsigned long ip = node->addr; in insert_fprobe_node()
80 hlist_add_before_rcu(&node->hlist, &next->hlist); in insert_fprobe_node()
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| D | Kconfig | 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
75 but does not want them included in the ftrace locations.
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
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| D | trace_export.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * trace_export.c - export basic ftrace utilities to user space
11 #include <linux/ftrace.h>
25 #define TRACE_SYSTEM ftrace
28 * The FTRACE_ENTRY_REG macro allows ftrace entry to define register
52 #define __array(type, item, size) type item[size]; argument
55 #define __stack_array(type, item, size, field) __array(type, item, size) argument
58 #define __array_desc(type, container, item, size) type item[size]; argument
78 /* force compile-time check on F_printk() */ \
91 .size = sizeof(_type), .align = __alignof__(_type), \
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| D | trace_boot.c | 1 // SPDX-License-Identifier: GPL-2.0
4 * Tracing kernel boot-time
11 #include <linux/ftrace.h>
32 /* Common ftrace options */ in trace_boot_set_instance_options()
63 pr_err("Buffer size is too small: %s\n", p); in trace_boot_set_instance_options()
133 return -ENOTSUPP; in trace_boot_add_kprobe_event()
170 return -ENOTSUPP; in trace_boot_add_synth_event()
182 return -ENOSPC; in append_printf()
185 ret = vsnprintf(*bufp, end - *bufp, fmt, args); in append_printf()
186 if (ret < end - *bufp) { in append_printf()
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| D | trace_selftest.c | 1 // SPDX-License-Identifier: GPL-2.0
12 switch (entry->type) { in trace_valid_entry()
33 while ((event = ring_buffer_consume(buf->buffer, cpu, NULL, NULL))) { in trace_test_buffer_cpu()
37 * The ring buffer is a size of trace_buf_size, if in trace_test_buffer_cpu()
38 * we loop more than the size, there's something wrong in trace_test_buffer_cpu()
47 entry->type); in trace_test_buffer_cpu()
57 return -1; in trace_test_buffer_cpu()
71 arch_spin_lock(&buf->tr->max_lock); in trace_test_buffer()
73 cnt = ring_buffer_entries(buf->buffer); in trace_test_buffer()
89 arch_spin_unlock(&buf->tr->max_lock); in trace_test_buffer()
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| D | ftrace.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * Infrastructure for profiling code inserted by 'gcc -pg'.
5 * Copyright (C) 2007-2008 Steven Rostedt <[email protected]>
6 * Copyright (C) 2004-2008 Ingo Molnar <[email protected]>
8 * Originally ported from the -rt patch by:
13 * Copyright (C) 2004-2006 Ingo Molnar
29 #include <linux/ftrace.h>
94 /* ftrace_enabled is a method to turn ftrace on or off */
107 if (!(ops->flags & FTRACE_OPS_FL_PID) || !ops->private) in ftrace_pids_enabled()
110 tr = ops->private; in ftrace_pids_enabled()
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| /linux-6.14.4/include/linux/ |
| D | fprobe.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Simple ftrace probe wrapper */
7 #include <linux/ftrace.h>
22 * struct fprobe_hlist_node - address based hash list node for fprobe.
35 * struct fprobe_hlist - hash list nodes for fprobe.
40 * @size: The size of @array.
47 int size; member
48 struct fprobe_hlist_node array[] __counted_by(size);
52 * struct fprobe - ftrace based probe.
56 * @entry_data_size: The private data storage size.
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| D | trace.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
10 * The trace export - an export of Ftrace output. The trace_export
12 * an addition to the current only output of Ftrace - i.e. ring buffer.
18 * next - pointer to the next trace_export
19 * write - copy traces which have been delt with ->commit() to
21 * flags - which ftrace to be exported
37 * trace_array_puts - write a constant string into the trace buffer.
43 str ? __trace_array_puts(tr, _THIS_IP_, str, strlen(str)) : -1; \
46 const char *str, int size);
66 return -EINVAL; in register_ftrace_export()
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| /linux-6.14.4/arch/s390/include/asm/ |
| D | module.h | 1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <asm-generic/module.h>
23 /* Size of the got. */
25 /* Size of the plt. */
32 /* Start of memory reserved for ftrace hotpatch trampolines. */
34 /* End of memory reserved for ftrace hotpatch trampolines. */
36 /* Next unused ftrace hotpatch trampoline slot. */
45 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; in find_section()
48 for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) { in find_section()
49 if (strcmp(name, secstrs + s->sh_name) == 0) in find_section()
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| /linux-6.14.4/Documentation/devicetree/bindings/reserved-memory/ |
| D | ramoops.yaml | 1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/reserved-memory/ramoops.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 recovered after a reboot. This is a child-node of "/reserved-memory", and
16 as kernel log messages, or for optional ECC error-correction data. The total
17 size of these optional buffers must fit in the reserved region.
20 records. These records have a configurable size, with a size of 0 indicating
23 At least one of "record-size", "console-size", "ftrace-size", or "pmsg-size"
24 must be set non-zero, but are otherwise optional as listed below.
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| /linux-6.14.4/Documentation/admin-guide/ |
| D | pstore-blk.rst | 1 .. SPDX-License-Identifier: GPL-2.0
7 ------------
10 block device and non-block device before the system crashes. You can get
13 mount -t pstore pstore /sys/fs/pstore
17 ---------------------
27 Configurations for driver are all about block device and non-block device,
31 -----------------------
51 #. /dev/<disk_name><decimal> represents the device number of partition - device
53 #. /dev/<disk_name>p<decimal> - same as the above; this form is used when disk
60 #. PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF represents the unique id of
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| /linux-6.14.4/tools/power/pm-graph/config/ |
| D | example.cfg | 9 # sudo ./sleepgraph.py -config config/example.cfg
14 # ---- General Options ----
25 # output folder for html, ftrace, and dmesg. Use {date} and {time} for current values
26 output-dir: suspend-{hostname}-{date}-{time}
33 # add the dmesg and ftrace log to the html output (default: false)
49 # Enable/disable runtime suspend for all devices, restore all after test (default: no-action)
53 # Switch the display on/off for the test using xset (default: no-action)
57 # Print the status of the test run in the given file (default: no-action)
64 # ---- Advanced Options ----
103 callloop-maxgap: 0.0001
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| /linux-6.14.4/Documentation/process/debugging/ |
| D | userspace_debugging_guide.rst | 1 .. SPDX-License-Identifier: GPL-2.0
20 -------------
22 Mechanism to filter what ends up in the kernel log by dis-/en-abling log
29 - pr_debug()
30 - dev_dbg()
31 - print_hex_dump_debug()
32 - print_hex_dump_bytes()
45 $ ddcmd '-p; file v4l2-h264.c +p'
47 drivers/media/v4l2-core/v4l2-h264.c:372 [v4l2_h264]print_ref_list_b =p
49 drivers/media/v4l2-core/v4l2-h264.c:333 [v4l2_h264]print_ref_list_p =p
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| /linux-6.14.4/tools/testing/selftests/rcutorture/bin/ |
| D | kvm-recheck-rcuscale-ftrace.sh | 2 # SPDX-License-Identifier: GPL-2.0+
5 # looking for ftrace data. Exits with 0 if data was found, analyzed, and
6 # printed. Intended to be invoked from kvm-recheck-rcuscale.sh after
9 # Usage: kvm-recheck-rcuscale-ftrace.sh resdir
18 if test "`grep -c 'rcu_exp_grace_period.*start' < $i/console.log`" -lt 100
23 sed -e 's/^\[[^]]*]//' < $i/console.log |
25 sed -e 's/us : / : /' |
26 tr -d '\015' |
39 curgpdur = $3 - starttime;
60 print "No ftrace records found???"
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| /linux-6.14.4/arch/x86/kernel/ |
| D | ftrace.c | 1 // SPDX-License-Identifier: GPL-2.0
5 * Copyright (C) 2007-2008 Steven Rostedt <[email protected]>
18 #include <linux/ftrace.h>
33 #include <asm/ftrace.h>
35 #include <asm/text-patching.h>
47 * ftrace has it set to "read/write". in ftrace_arch_code_modify_prepare()
94 return -EFAULT; in ftrace_verify_code()
101 return -EINVAL; in ftrace_verify_code()
133 unsigned long ip = rec->ip; in ftrace_make_nop()
151 * x86 overrides ftrace_replace_code -- this function will never be used in ftrace_make_nop()
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