|From:||Ingo Molnar <email@example.com>|
|Subject:||2.6.13-rt6, ktimer subsystem|
|Date:||Tue, 13 Sep 2005 12:00:40 +0200|
|Cc:||Thomas Gleixner <firstname.lastname@example.org>, Steven Rostedt <email@example.com>, firstname.lastname@example.org, George Anzinger <email@example.com>|
i have released the 2.6.13-rt6 tree, which can be downloaded from the usual place: http://redhat.com/~mingo/realtime-preempt/ there are lots of small updates all across and there's a big feature as well in this release: a complete rework of the high-resolution timers framework, from Thomas Gleixner, called 'ktimers'. under the ktimer framework the HR (and posix) timers live in a separate domain, have their own (per-CPU) rbtree to stay scalable and deterministic even with a high number of timers. Another positive effect of the introduction of separate ktimers is that kernel/timer.c is now using preemptible locks again, removing the cascade() worst-case latency. The cleanup factor is high as well: the ktimer framework slashes 1300+ lines off the HRT code. See kernel/ktimer.c for details. the end-effect of ktimers is a much more deterministic HRT engine. The original merging of HR timers into the stock timer wheel was a Bad Idea (tm). We intend to push the ktimer subsystem upstream as well. Changes since 2.6.13-rt1: - new ktimer subsystem to cleanly implement High Resolution Timers (Thomas Gleixner) - BKL fix for the new pi-lock code (Steven Rostedt) - SMP fix for the new pi-lock code (Steven Rostedt) - ALL_TASKS_PI updates (Daniel Walker, Steven Rostedt) - trace-irqs fix (Daniel Walker) - add raw_irqs_disabled() into the might_sleep() check (Daniel Walker) - turned off ALL_TASKS_PI - ide_lock updates - ioapic build fix - HRT build fixes to build a 2.6.13-rt6 tree, the following patches should be applied: http://kernel.org/pub/linux/kernel/v2.6/linux-2.6.13.tar.bz2 http://redhat.com/~mingo/realtime-preempt/patch-2.6.13-rt6 Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to firstname.lastname@example.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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