On 13-03-08 12:01 PM, Darren Hart wrote:
On 03/04/2013 08:04 PM, Insop Song wrote:
Hi,
I am preparing a new meta layer for testing and promoting a
sched_deadline scheduler, called "meta-dl". I am planning to add
scheduler testing tools and different kernel versions as well.
- http://insop.github.com/meta-dl/
Note that qemux86 doesn't support the EMGD graphics driver. You mention
this and its license in the README, but it isn't necessary. If you are
pulling that in, there is a problem with your recipes.
wow. mailing list delays are making this conversation *extremely*
painful and disjointed.
I highly recommend you do not use USB keys for real-time storage. I
would also suggest avoiding the hddimg as a test vehicle as it consumes
memory and other resources for the live image. If anything, use the live
image as an installer only.
For some added safety, consider using poky/contrib/ddimage instead of
dd. It is a simple wrapper script around DD which offers a device
blacklist and uses sysfs to present the user with some helpful
information to confirm the operation.
So you are using the sched_deadline patches, but not PREEMPT_RT, is that
right? I had always assumed sched_deadline ran on top of PREEMPT_RT (but
I haven't every tried building it myself).
sched_deadline applies to mainline, right on top of CFS as a scheduler
class. So in fact, I wouldn't suggest it with preempt-rt at all at the
moment.
What you have here is a good experimental layer. Looking forward, please
consider:
o Incorporating sched_deadline as a kernel feature into the
linux-yocto_3.8 kernel. We can easily add recipes to build a
linux-yocto-deadline kernel and you will get all the benefits of the
yocto tooling, testing, bugfixing, and free forward porting.
Already done. I've had it in linux-yocto-3.8 since I first introduced
it. We just need the supporting userspace to easily change the
scheduler class for a process.
o Incorporating your tests into (poky|oe-core)/meta/recipes-rt
Or if they aren't fully 'core', our new meta-realtime that I'd like
to have created shortly.
Cheers,
Bruce
With the help of hands-on kernel lab (thank you Tom and Darren), I am
able to make kernel with sched_deadline enabled.
Now, I am having some trouble of adding testing tools to this meta-dl,
and hope I can get some help from you.
- problem: adding a new software into my meta-dl layer
- symtom and questions?
1. bitbake core-image-minimal (normal image build) won't include the
additional program that I listed in .bb file below
2. If I do "bitbake schedtool-dl -c install" it builds and install,
but at "i586" location instead of my machine staging rootfs
(dl-qemux86)
- Here is my .bb file that pulls an additional program.
https://github.com/insop/meta-dl/blob/sched-dl-V7/recipes-tools/schedtool-dl/schedtool-dl.bb
===
DESCRIPTION = "schedtool-dl (scheduler test tool) for deadline scheduler"
HOMEPAGE = "https://github.com/insop/schedtool-dl"
SECTION = "base"
LICENSE = "GPLv2"
LIC_FILES_CHKSUM =
"file://Makefile;endline=55;md5=e4b4e8ed9c2132e1d727a1bb5e3bd984"
PR = "r1"
SRC_URI = "git://github.com/insop/schedtool-dl.git;protocol=git"
SRCREV = "${AUTOREV}"
S = "${WORKDIR}/git"
do_compile() {
oe_runmake
}
do_install() {
oe_runmake install DESTDIR=${D}
}
PARALLEL_MAKE = ""
Hopefully you can find the missing dependency in your makefile that
makes this necessary. This slows the build down and cumulatively, this
becomes a problem. This setting should always be considered a band-aid
and should have a comment starting with "FIXME: " ;-)
BBCLASSEXTEND = "native"
COMPATIBLE_MACHINE_dl-qemux86 = "dl-qemux86"
====
- I've updated my conf/layer.conf file to include above file
https://github.com/insop/meta-dl/blob/sched-dl-V7/conf/layer.conf
====
# We have a conf and classes directory, add to BBPATH
BBPATH := "${BBPATH}:${LAYERDIR}"
# We have a recipes directory, add to BBFILES
BBFILES := "${BBFILES} ${LAYERDIR}/recipes-*/*/*.bb \
${LAYERDIR}/recipes-*/*/*.bbappend"
BBFILE_COLLECTIONS += "dl-qemux86"
BBFILE_PATTERN_dl-qemux86 := "^${LAYERDIR}/"
BBFILE_PRIORITY_dl-qemux86 = "6"
=====
Thank you.
Regards,
Insop
- ref:
1. sched_deadline:
https://events.linuxfoundation.org/events/linuxcon-europe/song
2. sched_deadline:
http://events.linuxfoundation.org/images/stories/slides/elc2013_kobayashi.pdf?a
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