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Linux kernel source tree
dd01b985c5
It's an optional feature and remains 0 when bucket range is not given.
And it makes the histogram goes to the last entry always because any
latency (num) is greater than or equal to 0.
Before:
$ sudo ./perf ftrace latency -a -T do_futex sleep 1
# DURATION | COUNT | GRAPH |
0 - 0 us | 0 | |
1 - 2 us | 0 | |
2 - 4 us | 0 | |
4 - 8 us | 0 | |
8 - 16 us | 0 | |
16 - 32 us | 0 | |
32 - 64 us | 0 | |
64 - 128 us | 0 | |
128 - 256 us | 0 | |
256 - 512 us | 0 | |
512 - 1024 us | 0 | |
1 - 2 ms | 0 | |
2 - 4 ms | 0 | |
4 - 8 ms | 0 | |
8 - 16 ms | 0 | |
16 - 32 ms | 0 | |
32 - 64 ms | 0 | |
64 - 128 ms | 0 | |
128 - 256 ms | 0 | |
256 - 512 ms | 0 | |
512 - 1024 ms | 0 | |
1 - ... s | 1353 | ############################################## |
After:
$ sudo ./perf ftrace latency -a -T do_futex sleep 1
# DURATION | COUNT | GRAPH |
0 - 0 us | 321 | ########### |
1 - 2 us | 132 | #### |
2 - 4 us | 202 | ####### |
4 - 8 us | 188 | ###### |
8 - 16 us | 16 | |
16 - 32 us | 12 | |
32 - 64 us | 30 | # |
64 - 128 us | 98 | ### |
128 - 256 us | 53 | # |
256 - 512 us | 57 | ## |
512 - 1024 us | 9 | |
1 - 2 ms | 9 | |
2 - 4 ms | 1 | |
4 - 8 ms | 98 | ### |
8 - 16 ms | 5 | |
16 - 32 ms | 7 | |
32 - 64 ms | 32 | # |
64 - 128 ms | 10 | |
128 - 256 ms | 10 | |
256 - 512 ms | 2 | |
512 - 1024 ms | 0 | |
1 - ... s | 0 | |
Fixes:
|
||
|---|---|---|
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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 reStructuredText 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.