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Masami Hiramatsu 9c5b9d3d65 tracing/boot: Add boot-time tracing 
Setup tracing options via extra boot config in addition to kernel
command line.

This adds following commands support. These are applied to
the global trace instance.

 - ftrace.options = OPT1[,OPT2...]
   Enable given ftrace options.

 - ftrace.trace_clock = CLOCK
   Set given CLOCK to ftrace's trace_clock.

 - ftrace.buffer_size = SIZE
   Configure ftrace buffer size to SIZE. You can use "KB" or "MB"
   for that SIZE.

 - ftrace.events = EVENT[, EVENT2...]
   Enable given events on boot. You can use a wild card in EVENT.

 - ftrace.tracer = TRACER
   Set TRACER to current tracer on boot. (e.g. function)

Note that this is NOT replacing the kernel parameters, because
this boot config based setting is later than that. If you want to
trace earlier boot events, you still need kernel parameters.

Link: http://lkml.kernel.org/r/157867237723.17873.17494943526320587488.stgit@devnote2

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2020-01-13 13:19:41 -05:00
arch RISC-V updates for v5.5-rc6 2020-01-12 16:48:39 -08:00
block fs: move guard_bio_eod() after bio_set_op_attrs 2020-01-09 08:16:12 -07:00
certs
crypto
Documentation Documentation: bootconfig: Add a doc for extended boot config 2020-01-13 13:19:40 -05:00
drivers tracing: Make struct ring_buffer less ambiguous 2020-01-13 13:19:38 -05:00
fs proc: bootconfig: Add /proc/bootconfig to show boot config list 2020-01-13 13:19:39 -05:00
include tracing: kprobes: Output kprobe event to printk buffer 2020-01-13 13:19:40 -05:00
init bootconfig: init: Allow admin to use bootconfig for init command line 2020-01-13 13:19:40 -05:00
ipc
kernel tracing/boot: Add boot-time tracing 2020-01-13 13:19:41 -05:00
lib bootconfig: Add Extra Boot Config support 2020-01-13 13:19:38 -05:00
LICENSES
mm arm64: Revert support for execute-only user mappings 2020-01-06 10:10:07 -08:00
net tipc: fix wrong connect() return code 2020-01-08 15:57:35 -08:00
samples samples/seccomp: Zero out members based on seccomp_notif_sizes 2020-01-02 13:03:39 -08:00
scripts Kbuild fixes for v5.5 (2nd) 2020-01-03 11:21:25 -08:00
security + Bug fixes 2020-01-04 19:28:30 -08:00
sound sound fixes for 5.5-rc6 2020-01-10 11:52:36 -08:00
tools tools: bootconfig: Add bootconfig test script 2020-01-13 13:19:39 -05:00
usr gen_initramfs_list.sh: fix 'bad variable name' error 2020-01-04 00:00:48 +09:00
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS Documentation: bootconfig: Add a doc for extended boot config 2020-01-13 13:19:40 -05:00
Makefile Linux 5.5-rc6 2020-01-12 16:55:08 -08:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.