On 05/08/2012 09:45 PM, Scott Lavender wrote:
On Tue, May 8, 2012 at 11:02 AM, Ralf Mardorf<[email protected]>wrote:
I've got no time to read the whole thread, since I need to repair my
mixer. However, for a full preempt non-rt kernel there is no patch
required. It only depends to the config of a vanilla kernel.
Regarding to the CONFIG options in the previous post, there are some
CONFIG options missing, but those are already set for e.g. the
lowlatency kernel for Ubuntu Studio precise.
Regards,
Ralf
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I apologize. I realize my previous email was not as clear as I intended.
Ralph, the patch I mentioned was for the delta against the official Ubuntu
kernel. For those who are not aware, Studio starts with the official
Ubuntu kernel and changes a few compile flags. These changes are applied
in a patch.
Also, I meant to say that it seems disproportionate that the -lowlatency
kernel needs to be MANUALLY rebuilt for every kernel update given how close
they are and how easy it appears it can be automated with config options.
I don't think this is true.
There are at least two separate things that differ between the
ubuntu-precise kernel, and the ubuntu-precise-lowlatency kernel.
One is a patch to the code (which I assume is the two line patch that
has been under discussion), which as I explained previously will not be
needed anymore.
The other is the configuration used for the build. For the
configuration, we only need to set a few configs differently from the
standard ubuntu kernel (it's a long list), so that we get our
-lowlatency flavor kernel.
And after adding the configs that Ralph mentioned to the ones that we
already have specific for -lowlatency, as well as the configs that makes
the current patch unnessecary, we get this list:
CONFIG_CMDLINE_BOOL=y
CONFIG_CMDLINE="threadirqs"
# CONFIG_RCU_BOOST is not set
# CONFIG_NTP_PPS is not set
# CONFIG_RCU_CPU_STALL_DETECTOR is not set
# CONFIG_RCU_CPU_STALL_VERBOSE is not set
# CONFIG_PREEMPT_TRACER is not set
CONFIG_TREE_PREEMPT_RCU=y
CONFIG_PREEMPT_RCU=y
CONFIG_PREEMPT_NOTIFIERS=y
# CONFIG_PREEMPT_NONE is not set
# CONFIG_PREEMPT_VOLUNTARY is not set
CONFIG_PREEMPT=y
CONFIG_HZ_1000=y
CONFIG_HZ=1000
CONFIG_SLAB=y
# CONFIG_EXPERT is not set
# CONFIG_NO_HZ is not set
# CONFIG_DEBUG_KERNEL is not set
Using these configs on top of the default configs for the ubuntu-precise
kernel we get our current -lowlatency.
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