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[ Upstream commit 064d569e20e82c065b1dec9d20c29c7087bb1a00 ]
The use_nsec arg wasn't being taken into account when printing the first
histogram entry, fix it:
root@number:~# perf ftrace latency --use-nsec -T switch_mm_irqs_off -a sleep 2
# DURATION | COUNT | GRAPH |
0 - 1 us | 0 | |
1 - 2 ns | 0 | |
2 - 4 ns | 0 | |
4 - 8 ns | 0 | |
8 - 16 ns | 0 | |
16 - 32 ns | 0 | |
32 - 64 ns | 125 | |
64 - 128 ns | 335 | |
128 - 256 ns | 2155 | #### |
256 - 512 ns | 9996 | ################### |
512 - 1024 ns | 4958 | ######### |
1 - 2 us | 4636 | ######### |
2 - 4 us | 1053 | ## |
4 - 8 us | 15 | |
8 - 16 us | 1 | |
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 - ... ms | 0 | |
root@number:~#
After:
root@number:~# perf ftrace latency --use-nsec -T switch_mm_irqs_off -a sleep 2
# DURATION | COUNT | GRAPH |
0 - 1 ns | 0 | |
1 - 2 ns | 0 | |
2 - 4 ns | 0 | |
4 - 8 ns | 0 | |
8 - 16 ns | 0 | |
16 - 32 ns | 0 | |
32 - 64 ns | 19 | |
64 - 128 ns | 94 | |
128 - 256 ns | 2191 | #### |
256 - 512 ns | 9719 | #################### |
512 - 1024 ns | 5330 | ########### |
1 - 2 us | 4104 | ######## |
2 - 4 us | 807 | # |
4 - 8 us | 9 | |
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 - ... ms | 0 | |
root@number:~#
Fixes: 84005bb614 ("perf ftrace latency: Add -n/--use-nsec option")
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Gabriele Monaco <gmonaco@redhat.com>
Link: https://lore.kernel.org/r/ZyE3frB-hMXHCnMO@x1
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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.