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ref-manual: Added new python3 profile-optimization migration topic

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(From yocto-docs rev: 108adb60eabf43ddd4fa91f26b701e7a2930dcee)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Scott Rifenbark
2018-11-09 14:38:23 -08:00
committed by Richard Purdie
parent 44d52d9c72
commit 7d0a2ece0b
1 changed files with 33 additions and 0 deletions
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documentation/ref-manual/migration.xml
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@@ -6203,6 +6203,39 @@ id=f4d4f99cfbc2396e49c1613a7d237b9e57f06f81'>commit message</ulink>.
</para>
</section>
<section id='migration-2.6-python-3-profile-guided-optimizations'>
<title>Python 3 Profile-Guided Optimization</title>
<para>
The <filename>python3</filename> recipe now enables profile-guided
optimization.
Using this optimization requires a little extra build time in
exchange for improved performance on the target at runtime.
And, the optimization is only enabled if the current
<link linkend='var-MACHINE'><filename>MACHINE</filename></link>
has support for user-mode emulation in QEMU (i.e. "qemu-usermode"
is in
<link linkend='var-MACHINE_FEATURES'><filename>MACHINE_FEATURES</filename></link>,
which it is by default).
</para>
<para>
If you wish to disable Python profile-guided optimization
regardless of the value of
<filename>MACHINE_FEATURES</filename>, then ensure that
<link linkend='var-PACKAGECONFIG'><filename>PACKAGECONFIG</filename></link>
for the <filename>python3</filename> recipe does not contain "pgo".
You could accomplish the latter using the following at the
configuration level:
<literallayout class='monospaced'>
PACKAGECONFIG_remove_pn-python3 = "pgo"
</literallayout>
Alternatively, you can set
<filename>PACKAGECONFIG</filename> using an append file for the
<filename>python3</filename> recipe.
</para>
</section>
<section id='migration-2.6-miscellaneous-changes'>
<title>Miscellaneous Changes</title>