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Richard Purdie
19c75e92a1
This fsync was added for belt and braces protection for things like sstate on NFS. To be honest, it probably doesn't buy much, if the rename isn't atomic, all bets are off anyway and there are bigger issues to worry about. The issue is that at the end of every task, the dump_sig() code is triggered to save out information about the task and this was triggering an fsync(fd). Whilst it may select the file descriptor, on file systems like ext4, it will require large parts of the journal to be written out so it can have significant impact. latencytop showed an average fsync() call overhead of about 2s and if that happens for 5000 tasks, the time mounts up. This blocks the next task execution by that time. We therefore drop the fsync since in reality its causing problems and is unlikely to buy much. (Bitbake rev: 46fd841319479f6079d850b3813e64bd8c2680a3) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Poky
====
Poky is an integration of various components to form a complete prepackaged
build system and development environment. It features support for building
customised embedded device style images. There are reference demo images
featuring a X11/Matchbox/GTK themed UI called Sato. The system supports
cross-architecture application development using QEMU emulation and a
standalone toolchain and SDK with IDE integration.
Additional information on the specifics of hardware that Poky supports
is available in README.hardware. Further hardware support can easily be added
in the form of layers which extend the systems capabilities in a modular way.
As an integration layer Poky consists of several upstream projects such as
BitBake, OpenEmbedded-Core, Yocto documentation and various sources of information
e.g. for the hardware support. Poky is in turn a component of the Yocto Project.
The Yocto Project has extensive documentation about the system including a
reference manual which can be found at:
http://yoctoproject.org/documentation
OpenEmbedded-Core is a layer containing the core metadata for current versions
of OpenEmbedded. It is distro-less (can build a functional image with
DISTRO = "nodistro") and contains only emulated machine support.
For information about OpenEmbedded, see the OpenEmbedded website:
http://www.openembedded.org/
Where to Send Patches
=====================
As Poky is an integration repository, patches against the various components
should be sent to their respective upstreams.
bitbake:
bitbake-devel@lists.openembedded.org
meta-yocto:
poky@yoctoproject.org
Most everything else should be sent to the OpenEmbedded Core mailing list. If
in doubt, check the oe-core git repository for the content you intend to modify.
Before sending, be sure the patches apply cleanly to the current oe-core git
repository.
openembedded-core@lists.openembedded.org
Note: The scripts directory should be treated with extra care as it is a mix
of oe-core and poky-specific files.