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bitbake: doc: bitbake-user-manual: Add definition for BB_PRESSURE_MAX variables

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Add the definitions for the BB_PRESSURE_MAX{CPU|IO|MEMORY} variables in the
bitbake varibales glossary. Further information on how to determine a good
threshold will be added to the Yocto reference manual in a later commit.

(Bitbake rev: c014281f72f4f54ec8e681ef2b8e1080de9ab5cf)

Signed-off-by: Aryaman Gupta <aryaman.gupta@windriver.com>
Signed-off-by: Randy Macleod <Randy.Macleod@windriver.com>
Signed-off-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Michael Opdenacker <michael.opdenacker@bootlin.com>
Reviewed-by: Quentin Schulz <foss+yocto@0leil.net>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Aryaman Gupta
2022-09-19 16:58:12 +02:00
committed by Richard Purdie
parent f761409551
commit 764bbf2a9b
1 changed files with 25 additions and 0 deletions
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bitbake/doc/bitbake-user-manual/bitbake-user-manual-ref-variables.rst
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@@ -483,6 +483,31 @@ overview of their function and contents.
You must set this variable in the external environment in order
for it to work.
:term:`BB_PRESSURE_MAX_CPU`
The threshold for maximum CPU pressure before BitBake prevents the
scheduling of new tasks. Once the :term:`BB_PRESSURE_MAX_CPU` threshold
is exceeded, new tasks are not started until the pressure subsides to
below the threshold. If :term:`BB_PRESSURE_MAX_CPU` is not set, CPU
pressure is not monitored. A threshold can be set in ``conf/local.conf``
as::
BB_PRESSURE_MAX_CPU = "500"
:term:`BB_PRESSURE_MAX_IO`
The threshold for maximum IO pressure experienced before BitBake
prevents the scheduling of new tasks. The IO pressure is regulated in the
same way as :term:`BB_PRESSURE_MAX_CPU`. At this point in time,
experiments show that IO pressure tends to be short-lived and regulating
just the CPU can help to reduce it.
:term:`BB_PRESSURE_MAX_MEMORY`
The threshold for maximum memory pressure experienced before BitBake
prevents the scheduling of new tasks. The memory pressure is regulated in
the same way as :term:`BB_PRESSURE_MAX_CPU`. Note that any memory
pressure indicates that a system is being pushed beyond its capacity. At
this point in time, experiments show that memory pressure tends to be
short-lived and regulating just the CPU can help to reduce it.
:term:`BB_RUNFMT`
Specifies the name of the executable script files (i.e. run files)
saved into ``${``\ :term:`T`\ ``}``. By default, the