Dear RT folks!
I'm pleased to announce the v3.18.7-rt1 patch set. It was running over
the weekend on my x86 box and was still alive this morning. However it
is still the first release for the v3.18 -RT series.
I haven't follow the mailing list or commented / applied any patches
from the list for -RT while being busy getting this release done (except
one patch I needed to have anyway). This is about to change. I will try to
go through my RT-inbox before doing the next release.
Changes since v3.14.25-rt22
- rebased to v3.18
- Added "Work Simple" from Daniel Wagner. I needed it for cgroup's RCU
handling.
- "timers: do not raise softirq unconditionally" has been reverted. It
has been added to optimize the FULL NOHZ case on CPUs which could avoid
a softirq / timer wake up. Its been reverted because it breaks the
switch to highres.
- added a few patches to get MQ-BLK and cgroups working.
Known issues:
- bcache is disabled.
- lazy preempt on x86_64 leads to a crash with some load.
- CPU hotplug works in general. Steven's test script however
deadlocks usually on the second invocation.
- xor / raid_pq
I had max latency jumping up to 67563us on one CPU while the next
lower max was 58us. I tracked it down to module's init code of
xor and raid_pq. Both disable preemption while measuring the
measuring the performance of the individual implementation.
The RT patch against 3.18.7 can be found here:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patch-3.18.7-rt1.patch.xz
The split quilt queue is available at:
https://www.kernel.org/pub/linux/kernel/projects/rt/3.18/patches-3.18.7-rt1.tar.xz
Sebastian
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