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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-29 11:21:49 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-12-29 11:21:49 -0800 |
commit | 3868772b99e3146d02cf47e739d79022eba1d77c (patch) | |
tree | d32c0283496e6955937b618981766b5f0878724f /Documentation/trace | |
parent | 6f9d71c9c759b1e7d31189a4de228983192c7dc7 (diff) | |
parent | 942104a21ce4951420ddf6c6b3179a0627301f7e (diff) | |
download | linux-3868772b99e3146d02cf47e739d79022eba1d77c.tar.bz2 |
Merge tag 'docs-5.0' of git://git.lwn.net/linux
Pull documentation update from Jonathan Corbet:
"A fairly normal cycle for documentation stuff. We have a new document
on perf security, more Italian translations, more improvements to the
memory-management docs, improvements to the pathname lookup
documentation, and the usual array of smaller fixes.
As is often the case, there are a few reaches outside of
Documentation/ to adjust kerneldoc comments"
* tag 'docs-5.0' of git://git.lwn.net/linux: (38 commits)
docs: improve pathname-lookup document structure
configfs: fix wrong name of struct in documentation
docs/mm-api: link slab_common.c to "The Slab Cache" section
slab: make kmem_cache_create{_usercopy} description proper kernel-doc
doc:process: add links where missing
docs/core-api: make mm-api.rst more structured
x86, boot: documentation whitespace fixup
Documentation: devres: note checking needs when converting
doc:it: add some process/* translations
doc:it: fixes in process/1.Intro
Documentation: convert path-lookup from markdown to resturctured text
Documentation/admin-guide: update admin-guide index.rst
Documentation/admin-guide: introduce perf-security.rst file
scripts/kernel-doc: Fix struct and struct field attribute processing
Documentation: dev-tools: Fix typos in index.rst
Correct gen_init_cpio tool's documentation
Document /proc/pid PID reuse behavior
Documentation: update path-lookup.md for parallel lookups
Documentation: Use "while" instead of "whilst"
dmaengine: Add mailing list address to the documentation
...
Diffstat (limited to 'Documentation/trace')
-rw-r--r-- | Documentation/trace/ftrace.rst | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/Documentation/trace/ftrace.rst b/Documentation/trace/ftrace.rst index f82434f2795e..0131df7f5968 100644 --- a/Documentation/trace/ftrace.rst +++ b/Documentation/trace/ftrace.rst @@ -24,13 +24,13 @@ It can be used for debugging or analyzing latencies and performance issues that take place outside of user-space. Although ftrace is typically considered the function tracer, it -is really a frame work of several assorted tracing utilities. +is really a framework of several assorted tracing utilities. There's latency tracing to examine what occurs between interrupts disabled and enabled, as well as for preemption and from a time a task is woken to the task is actually scheduled in. One of the most common uses of ftrace is the event tracing. -Through out the kernel is hundreds of static event points that +Throughout the kernel is hundreds of static event points that can be enabled via the tracefs file system to see what is going on in certain parts of the kernel. @@ -462,7 +462,7 @@ of ftrace. Here is a list of some of the key files: mono_raw: This is the raw monotonic clock (CLOCK_MONOTONIC_RAW) - which is montonic but is not subject to any rate adjustments + which is monotonic but is not subject to any rate adjustments and ticks at the same rate as the hardware clocksource. boot: @@ -914,8 +914,8 @@ The above is mostly meaningful for kernel developers. current trace and the next trace. - '$' - greater than 1 second - - '@' - greater than 100 milisecond - - '*' - greater than 10 milisecond + - '@' - greater than 100 millisecond + - '*' - greater than 10 millisecond - '#' - greater than 1000 microsecond - '!' - greater than 100 microsecond - '+' - greater than 10 microsecond @@ -2541,7 +2541,7 @@ At compile time every C file object is run through the recordmcount program (located in the scripts directory). This program will parse the ELF headers in the C object to find all the locations in the .text section that call mcount. Starting -with gcc verson 4.6, the -mfentry has been added for x86, which +with gcc version 4.6, the -mfentry has been added for x86, which calls "__fentry__" instead of "mcount". Which is called before the creation of the stack frame. @@ -2978,7 +2978,7 @@ The following commands are supported: When the function is hit, it will dump the contents of the ftrace ring buffer to the console. This is useful if you need to debug something, and want to dump the trace when a certain function - is hit. Perhaps its a function that is called before a tripple + is hit. Perhaps it's a function that is called before a triple fault happens and does not allow you to get a regular dump. - cpudump: |