| From: |
| Ingo Molnar <mingo@elte.hu> |
| To: |
| linux-kernel@vger.kernel.org |
| Subject: |
| [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.21 |
| Date: |
| Mon, 8 Nov 2004 17:57:18 +0100 |
| Cc: |
| Lee Revell <rlrevell@joe-job.com>,
Rui Nuno Capela <rncbc@rncbc.org>,
Mark_H_Johnson@Raytheon.com, "K.R. Foley" <kr@cybsft.com>,
Bill Huey <bhuey@lnxw.com>, Adam Heath <doogie@debian.org>,
Florian Schmidt <mista.tapas@gmx.net>,
Thomas Gleixner <tglx@linutronix.de>,
Michal Schmidt <xschmi00@stud.feec.vutbr.cz>,
Fernando Pablo Lopez-Lezcano <nando@ccrma.Stanford.EDU>,
Karsten Wiese <annabellesgarden@yahoo.de>,
Gunther Persoons <gunther_persoons@spymac.com>, emann@mrv.com,
Shane Shrybman <shrybman@aei.ca> |
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...
http://kernel.org/pub/linux/kernel/people/akpm/patches/2....
http://redhat.com/~mingo/realtime-preempt/realtime-preemp...
Ingo
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