lkml.org 
[lkml]   [2004]   [Nov]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
Subject[patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.21

i have released the -V0.7.21 Real-Time Preemption patch, which can be
downloaded from the usual place:

http://redhat.com/~mingo/realtime-preempt/

this release includes fixes and debugging-improvements.

Changes since -V0.7.20:

- reverted the modlist_lock change - it caused more problems than it
solved.

- implemented irqs-off critical section timing/tracing, inspired by the
positive results Thomas Gleixner got with a different kind of cli/sti
tracer. To activate it, enable CONFIG_CRITICAL_TIMING and
CONFIG_CRITICAL_IRQSOFF_TIMING and cli/sti latencies will be reported
'integrated' into the preempt on/off latencies.

- sped up tracing in a number of ways. Performance of the tracer slowly
eroded in the past week or two, it needed alignment and size fixes ,
inlining/branch-prediction updates and i got rid of unnecessary code.
The max latency is now traced in cycles - this got rid of an
expensive 64-bit division in the fastpath. (the /proc/sys tunables
are still in usecs so userspace should not notice anything.) It's
still not cheap but roughly 5 times faster than -V0.7.20's tracer, on
a fast desktop box.

- renamed CONFIG_PREEMPT_REALTIME to CONFIG_PREEMPT_RT - it's shorter.

- renamed CONFIG_PREEMPT_TIMING to CONFIG_CRITICAL_TIMING and
introduced CONFIG_CRITICAL_IRQSOFF_TIMING to enable cli/sti timing.

to create a -V0.7.21 tree from scratch, the patching order is:

http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.9.tar.bz2
http://kernel.org/pub/linux/kernel/v2.6/testing/patch-2.6.10-rc1.bz2
http://kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.10-rc1/2.6.10-rc1-mm3/2.6.10-rc1-mm3.bz2
http://redhat.com/~mingo/realtime-preempt/realtime-preempt-2.6.10-rc1-mm3-V0.7.21

Ingo
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:07    [W:1.105 / U:4.396 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site