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Arnaldo Carvalho de Melo aac3361f6d perf ftrace latency: Fix unit on histogram first entry when using --use-nsec [ Upstream commit `064d569e20` ] 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>		History 2024-12-09 10:32:25 +01:00
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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.