The Status of the Preempt-RT Patch
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1 The Status of the Preempt-RT Patch Embedded Linux Conference Europe 217 Sebastian A. Siewior Linutronix GmbH October 24, 217 Sebastian A. Siewior Linutronix GmbH 1/35
2 1 Overview 2 The patchqueue 3 Summary Sebastian A. Siewior Linutronix GmbH 2/35
3 1 Overview 2 The patchqueue 3 Summary Sebastian A. Siewior Linutronix GmbH 3/35
4 What is PREEMPT-RT A patchset provided for certain kernels Provides realtime functionality Preempts softirq, spinlocks, IRQ-off regions Is super deterministic, not super fast Sebastian A. Siewior Linutronix GmbH 4/35
5 PREEMPT-RT Project was without funds for a few years LF announced RTL Collaborative Project in October 215 Documentation Testing Sebastian A. Siewior Linutronix GmbH 5/35
6 1 Overview 2 The patchqueue 3 Summary Sebastian A. Siewior Linutronix GmbH 6/35
7 v v rt14 v rt13 v rt12 v rt11 v rt1 v rt9 v rt8 v3.1.1-rt7 v3.1.1-rt6 v3.1.9-rt5 v3.1.9-rt4 v3.1.6-rt3 v3.1.6-rt2 v3.1.4-rt1 Sebastian A. Siewior Linutronix GmbH 7/35
8 v v rt25 v rt24 v rt23 v rt22 v rt21 v rt2 v rt19 v rt18 v rt17 v rt16 v rt15 v rt14 v rt13 v rt12 v rt11 v rt1 v rt9 v rt8 v rt7 v rt6 v rt5 v rt4 v rt3 v3.12.-rt2 v3.12.-rt1 Sebastian A. Siewior Linutronix GmbH 8/35
9 v v rt5 v rt4 v rt3 v rt2 v3.14.-rt1 Sebastian A. Siewior Linutronix GmbH 9/35
10 v v rt1 v rt9 v rt8 v rt7 v rt6 v rt5 v rt4 v rt3 v rt2 v rt1 Sebastian A. Siewior Linutronix GmbH 1/35
11 v v4..8-rt6 v4..8-rt5 v4..5-rt4 v4..5-rt3 v4..5-rt2 v4..4-rt1 Sebastian A. Siewior Linutronix GmbH 11/35
12 v v rt17 v rt16 v rt15 v rt14 v rt13 v rt12 v4.1.1-rt11 v4.1.1-rt1 v4.1.7-rt8 v4.1.7-rt7 v4.1.6-rt6 v4.1.5-rt5 v4.1.5-rt4 v4.1.3-rt3 v4.1.3-rt2 v4.1.2-rt1 Sebastian A. Siewior Linutronix GmbH 12/35
13 v TI GPIO rework v rt17 v rt16 v rt15 v rt14 v rt13 v rt12 v4.1.1-rt11 v4.1.1-rt1 v4.1.7-rt8 v4.1.7-rt7 v4.1.6-rt6 v4.1.5-rt5 v4.1.5-rt4 v4.1.3-rt3 v4.1.3-rt2 v4.1.2-rt1 Sebastian A. Siewior Linutronix GmbH 13/35
14 v v rt19 v rt18 v4.4.9-rt17 v4.4.7-rt16 v4.4.7-rt15 v4.4.6-rt14 v4.4.6-rt13 v4.4.6-rt12 v4.4.4-rt11 v4.4.4-rt1 v4.4.3-rt9 v4.4.3-rt8 v4.4.2-rt7 v4.4.1-rt6 v4.4.1-rt5 v4.4.1-rt4 v4.4-rt3 v4.4-rt2 v4.4-rc6-rt1 Sebastian A. Siewior Linutronix GmbH 14/35
15 v AT91, SWAIT in TIP v rt19 v rt18 v4.4.9-rt17 v4.4.7-rt16 v4.4.7-rt15 v4.4.6-rt14 v4.4.6-rt13 v4.4.6-rt12 v4.4.4-rt11 v4.4.4-rt1 v4.4.3-rt9 v4.4.3-rt8 v4.4.2-rt7 v4.4.1-rt6 v4.4.1-rt5 v4.4.1-rt4 v4.4-rt3 v4.4-rt2 v4.4-rc6-rt1 Sebastian A. Siewior Linutronix GmbH 15/35
16 v v4.6.7-rt14 v4.6.7-rt13 v4.6.7-rt12 v4.6.7-rt11 v4.6.5-rt1 v4.6.5-rt9 v4.6.4-rt8 v4.6.4-rt7 v4.6.4-rt6 v4.6.2-rt5 v4.6.2-rt4 v4.6.1-rt3 v4.6.1-rt2 v4.6-rc7-rt1 Sebastian A. Siewior Linutronix GmbH 16/35
17 v Timer wheel rework TIP v4.6.7-rt14 v4.6.7-rt13 v4.6.7-rt12 v4.6.7-rt11 v4.6.5-rt1 v4.6.5-rt9 v4.6.4-rt8 v4.6.4-rt7 v4.6.4-rt6 v4.6.2-rt5 v4.6.2-rt4 v4.6.1-rt3 v4.6.1-rt2 v4.6-rc7-rt1 Sebastian A. Siewior Linutronix GmbH 17/35
18 v v rt1 v rt9 v rt8 v rt7 v rt6 v4.8.6-rt5 v4.8.6-rt4 v4.8.2-rt3 v4.8.2-rt2 v4.8-rt1 Sebastian A. Siewior Linutronix GmbH 18/35
19 v v rt23 v rt22 v4.9.3-rt21 v4.9.3-rt2 v4.9.3-rt19 v rt18 v rt17 v4.9.2-rt16 v4.9.2-rt15 v rt14 v rt13 v rt12 v rt11 v rt1 v rt9 v rt8 v4.9.1-rt7 v4.9.9-rt6 v4.9.9-rt5 v4.9.6-rt4 v4.9.6-rt3 v4.9.4-rt2 v4.9-rt1 Sebastian A. Siewior Linutronix GmbH 19/35
20 v4.9 FUTEX rework More FUTEX v rt23 v rt22 v4.9.3-rt21 v4.9.3-rt2 v4.9.3-rt19 v rt18 v rt17 v4.9.2-rt16 v4.9.2-rt15 v rt14 v rt13 v rt12 v rt11 v rt1 v rt9 v rt8 v4.9.1-rt7 v4.9.9-rt6 v4.9.9-rt5 v4.9.6-rt4 v4.9.6-rt3 v4.9.4-rt2 v4.9-rt1 Sebastian A. Siewior Linutronix GmbH 2/35
21 v v rt16 v rt15 v rt14 v rt13 v rt12 v rt11 v rt1 v rt9 v rt8 v rt7 v rt6 v rt5 v rt4 v rt3 v rt2 v rt1 Sebastian A. Siewior Linutronix GmbH 21/35
22 v CPU-Hotplug rework Inter-event tracing HR-Timer rework v rt16 v rt15 v rt14 v rt13 v rt12 v rt11 v rt1 v rt9 v rt8 v rt7 v rt6 v rt5 v rt4 v rt3 v rt2 v rt1 Sebastian A. Siewior Linutronix GmbH 22/35
23 v v rt1 v rt1 Sebastian A. Siewior Linutronix GmbH 23/35
24 Summary v rt1 v rt16 v rt1 v rt23 v4.9-rt1 v rt1 v4.8-rt1 v4.6.7-rt14 v4.6-rc7-rt1 v rt19 v4.4-rc6-rt1 v rt17 v4.1.2-rt1 v4..8-rt6 v4..4-rt1 v rt1 v rt1 v rt5 v3.14.-rt1 v rt25 v3.12.-rt1 v rt14 v3.1.4-rt1 Sebastian A. Siewior Linutronix GmbH 24/35
25 Summary Queue cleanup v rt1 v rt16 v rt1 v rt23 v4.9-rt1 v rt1 v4.8-rt1 v4.6.7-rt14 v4.6-rc7-rt1 v rt19 v4.4-rc6-rt1 v rt17 v4.1.2-rt1 v4..8-rt6 v4..4-rt1 v rt1 v rt1 v rt5 v3.14.-rt1 v rt25 v3.12.-rt1 v rt14 v3.1.4-rt1 Sebastian A. Siewior Linutronix GmbH 25/35
26 1 Overview 2 The patchqueue 3 Summary Sebastian A. Siewior Linutronix GmbH 26/35
27 The focus during development v4.4 to v4.9 RT was mostly quiet Focus on upstream and CPU hotplug A few attempts were made in v4.9, finally in v4.11 The strategy changed a few times within RT Sebastian A. Siewior Linutronix GmbH 27/35
28 What RT version gets released Starting with v4.4 every other version Once Greg KH decides to make a different LTS, we follow that So we got RT for v4.8 and v4.9 we continue every other version until Greg KH v4.13 and v4.14 Sebastian A. Siewior Linutronix GmbH 28/35
29 What RT versions are maintained Basically every supported upstream kernel Steven Rostedt maintains most of them Julia Cartwright maintains the v4.1 tree Features are hardly backported, mostly fixes Sebastian A. Siewior Linutronix GmbH 29/35
30 Major pieces Page fault disable by s/39 timer wheel rework, made NO_HZ_FULL work CPU hotplug rework, started around v4.1 hrtimer rework (pending). Tom Zanussi s tracing: Inter-event (e.g. latency) support (pending). Sebastian A. Siewior Linutronix GmbH 3/35
31 Tiny pieces FUTEX rework. Closes PI-deboost problems, unbreaks SCHED_DEADLINE RW-Semaphore rework (unbreaks the radeon driver) RW-Lock rework. Helps CPU hotplug Fix for a bug exploited by GDB A lot driver and subsystem across tree. Sebastian A. Siewior Linutronix GmbH 31/35
32 Outstanding pieces MM bits. Shorter atomic sections in buddy / SLUB migrate disable local lock network bits printk, serial drivers signal delivery bit spinlocks / list_bl RCU Sebastian A. Siewior Linutronix GmbH 32/35
33 Outstanding pieces simple wait queues dcache try loops and cpu_chill() workqueue locking crypto, FPU sections sleeping spinlocks softirq bits various driver patches Sebastian A. Siewior Linutronix GmbH 33/35
34 Required patches vs nice to have Required features Sleeping spin locks Nice to have lazy preempt support Should have but preempt disabling handling, WARN_ON Sebastian A. Siewior Linutronix GmbH 34/35
35 Thank you for your attention Contact Linutronix GmbH Sebastian A. Siewior Auf dem Berg Uhldingen Germany bigeasy@linutronix.de Sebastian A. Siewior Linutronix GmbH 35/35
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