Steven Rostedt (Google)
bcb65adaa9
ftrace/scripts: Update the instructions for ftrace-bisect.sh ...
commit 7ae4ba7195b1bac04a4210a499da9d8c63b0ba9c upstream.
The instructions for the ftrace-bisect.sh script, which is used to find
what function is being traced that is causing a kernel crash, and possibly
a triple fault reboot, uses the old method. In 5.1, a new feature was
added that let the user write in the index into available_filter_functions
that maps to the function a user wants to set in set_ftrace_filter (or
set_ftrace_notrace). This takes O(1) to set, as suppose to writing a
function name, which takes O(n) (where n is the number of functions in
available_filter_functions).
The ftrace-bisect.sh requires setting half of the functions in
available_filter_functions, which is O(n^2) using the name method to enable
and can take several minutes to complete. The number method is O(n) which
takes less than a second to complete. Using the number method for any
kernel 5.1 and after is the proper way to do the bisect.
Update the usage to reflect the new change, as well as using the
/sys/kernel/tracing path instead of the obsolete debugfs path.
Link: https://lkml.kernel.org/r/20230123112252.022003dd@gandalf.local.home
Cc: stable@vger.kernel.org
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Fixes: f79b3f3385
2023-02-06 07:52:44 +01:00
scripts: add dummy report mode to add_namespace.cocci
2020-08-11 15:33:35 +02:00
scripts/dtc: dtx_diff: remove broken example from help text
2022-01-27 09:19:55 +01:00
gcc-plugins: latent_entropy: use /dev/urandom
2022-04-20 09:19:38 +02:00
scripts/gdb: change kernel config dumping method
2022-06-14 18:12:02 +02:00
kconfig: fix failing to generate auto.conf
2022-02-23 12:00:01 +01:00
modpost: fix section mismatch check for exported init/exit sections
2022-06-29 08:58:49 +02:00
kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables
2020-09-03 11:27:10 +02:00
selinux: use "grep -E" instead of "egrep"
2022-10-26 13:22:21 +02:00
ftrace/scripts: Update the instructions for ftrace-bisect.sh
2023-02-06 07:52:44 +01:00
scripts: switch explicitly to Python 3
2021-05-22 11:38:30 +02:00
checkpatch: fix unescaped left brace
2020-12-30 11:51:27 +01:00
tweewide: Fix most Shebang lines
2021-05-22 11:38:30 +02:00
scripts/decode_stacktrace: strip basepath from all paths
2020-07-29 10:18:35 +02:00
scripts/decodecode: fix trapping instruction formatting
2020-05-14 07:58:29 +02:00
depmod: handle the case of /sbin/depmod without /sbin in PATH
2021-01-12 20:16:10 +01:00
scripts: switch explicitly to Python 3
2021-05-22 11:38:30 +02:00
cert host tools: Stop complaining about deprecated OpenSSL functions
2022-11-25 17:42:10 +01:00
scripts/faddr2line: Fix regression in name resolution on ppc64le
2022-12-08 11:23:02 +01:00
kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y
2021-09-22 12:26:26 +02:00
tweewide: Fix most Shebang lines
2021-05-22 11:38:30 +02:00
scripts: headers_install: Exit with error on config leak
2020-06-24 17:50:33 +02:00
kbuild: remove the target in signal traps when interrupted
2022-10-26 13:22:46 +02:00
leaking_addresses: Always print a trailing newline
2021-11-17 09:48:31 +01:00
bpf: Support llvm-objcopy for vmlinux BTF
2020-06-17 16:40:20 +02:00
scripts: set proper OpenSSL include dir also for sign-file
2021-02-26 10:10:27 +01:00
kbuild: Fix objtool dependency for 'OBJECT_FILES_NON_STANDARD_<obj> := n'
2021-07-14 16:53:20 +02:00
Makefile.extrawarn: Move -Wcast-function-type-strict to W=1
2022-10-07 09:16:57 +02:00
gcc-plugins: Undefine LATENT_ENTROPY_PLUGIN when plugin disabled for a file
2022-08-25 11:18:31 +02:00
kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables
2020-09-03 11:27:10 +02:00
kbuild: Fix include path in scripts/Makefile.modpost
2022-09-05 10:27:45 +02:00
kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables
2020-09-03 11:27:10 +02:00
kbuild: mkcompile_h: consider timestamp if KBUILD_BUILD_TIMESTAMP is set
2021-07-25 14:35:12 +02:00
mksysmap: Fix the mismatch of 'L0' symbols in System.map
2022-09-28 11:03:59 +02:00
scripts: add dummy report mode to add_namespace.cocci
2020-08-11 15:33:35 +02:00
ftrace: Have recordmcount use w8 to read relp->r_info in arm64_is_fake_mcount
2021-03-09 11:09:39 +01:00
recordmcount: Correct st_shndx handling
2021-06-30 08:47:49 -04:00
recordmcount.pl: fix typo in s390 mcount regex
2022-01-05 12:37:44 +01:00
scripts/setlocalversion: make git describe output more reliable
2020-11-01 12:01:01 +01:00
tweewide: Fix most Shebang lines
2021-05-22 11:38:30 +02:00
cert host tools: Stop complaining about deprecated OpenSSL functions
2022-11-25 17:42:10 +01:00
tweewide: Fix most Shebang lines
2021-05-22 11:38:30 +02:00
tweewide: Fix most Shebang lines
2021-05-22 11:38:30 +02:00
Makefile: fix GDB warning with CONFIG_RELR
2021-07-14 16:53:12 +02:00
kbuild: add variables for compression tools
2020-09-03 11:27:10 +02:00
bcb65adaa9