Re: [rfc patch] hotplug: Call mmdrop_delayed() in sched_cpu_dying() if... | linux-rt-users

[ANNOUNCE] 4.8-rt1 · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-06
[patch] ftrace: Fix latency trace header alignment · Mike Galbraith <hidden> · 2016-10-16
Re: [patch] ftrace: Fix latency trace header alignment · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-17
[patch] drivers,connector: Protect send_msg() with a local lock for RT · Mike Galbraith <hidden> · 2016-10-16
Re: [patch] drivers,connector: Protect send_msg() with a local lock for RT · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-17
[patch] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Mike Galbraith <hidden> · 2016-10-16
Re: [patch] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-17
Re: [patch] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Mike Galbraith <hidden> · 2016-10-17
Re: [patch] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-17
Re: [patch] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Mike Galbraith <hidden> · 2016-10-17
Re: [patch] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Mike Galbraith <hidden> · 2016-10-17
[patch v2] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Mike Galbraith <hidden> · 2016-10-19
Re: [patch v2] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-19
Re: [patch v2] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Mike Galbraith <hidden> · 2016-10-20
Re: [patch v2] drivers/zram: Don't disable preemption in zcomp_stream_get/put() · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-20
[patch ]mm/zs_malloc: Fix bit spinlock replacement · Mike Galbraith <hidden> · 2016-10-16
Re: [patch ]mm/zs_malloc: Fix bit spinlock replacement · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-17
Re: [patch ]mm/zs_malloc: Fix bit spinlock replacement · Mike Galbraith <hidden> · 2016-10-17
[patch v2 ] mm/zs_malloc: Fix bit spinlock replacement · Mike Galbraith <hidden> · 2016-10-19
Re: [patch v2 ] mm/zs_malloc: Fix bit spinlock replacement · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-20
[rfc patch] hotplug: Call mmdrop_delayed() in sched_cpu_dying() if PREEMPT_RT_FULL · Mike Galbraith <hidden> · 2016-10-20
Re: [rfc patch] hotplug: Call mmdrop_delayed() in sched_cpu_dying() if PREEMPT_RT_FULL · Sebastian Andrzej Siewior <bigeasy@linutronix.de> · 2016-10-20

Re: [rfc patch] hotplug: Call mmdrop_delayed() in sched_cpu_dying() if PREEMPT_RT_FULL

From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: 2016-10-20 11:21:50
Also in: lkml

On 2016-10-20 11:34:03 [+0200], Mike Galbraith wrote:

My 64 core box just passed an hour running Steven's hotplug stress
script along with stockfish and futextests (tip-rt.today w. hotplug
hacks you saw a while back), and seems content to just keep on grinding
away.  Without it, box quickly becomes a doorstop.

This is new. It is v4.7-rc1 new. The hotplug rework moved the notified
around and after

e9cd8fa4fcfd ("sched/migration: Move calc_load_migrate() into CPU_DYING")
f2785ddb5367 ("sched/hotplug: Move migration CPU_DYING to sched_cpu_dying()")

we have no more CPU_DEAD, just CPU_DYING which is invoked with
interrupts off. I don't see anything wrong with pushing this over to
RCU.

Sebastian

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