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Re: [ANNOUNCE] 4.4-rc6-rt1

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  Re: [ANNOUNCE] 4.4-rc6-rt1 Grygorii Strashko <grygorii.strashko@ti.com> - 2016-01-22 16:40 +0100
    Re: [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-22 16:50 +0100
      Re: [ANNOUNCE] 4.4-rc6-rt1 Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-01-22 21:50 +0100

#1315076 — Re: [ANNOUNCE] 4.4-rc6-rt1

On 12/24/2015 12:57 AM, Sebastian Andrzej Siewior wrote:
> Please don't continue reading before christmas eve (or morning,
> depending on your schedule). If you don't celebrate christmas,
> well go ahead.
>
> Dear RT folks!
>
> I'm pleased to announce the v4.4-rc6-rt1 patch set. I tested it on my
> AMD A10, 64bit. Nothing exploded so far, filesystem is still there.
> I haven't tested it on anything else. Before someone asks: this does not
> mean it does *not* work on ARM I simply did not try it.
>
> If you are brave then download it, install it and have fun. If something
> breaks, please report it. If your machine starts blinking like a
> christmas tree while using the patch then *please* send a photo.
>
> Changes since v4.1.15-rt17:
>    - rebase to v4.4-rc6
>
> Known issues (inherited from v4.1-RT):
>        - bcache stays disabled
>
>        - CPU hotplug is not better than before
>
>        - The netlink_release() OOPS, reported by Clark, is still on the
>          list, but unsolved due to lack of information
>
>        - Christoph Mathys reported a stall in cgroup locking code while using
>          Linux containers.
>
> You can get this release via the git tree at:
>
>      git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git v4.4-rc6-rt1
>
> The RT patch against 4.4-rc6 can be found here:
>
>      https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patch-4.4-rc6-rt1.patch.xz
>
> The split quilt queue is available at:
>
>      https://cdn.kernel.org/pub/linux/kernel/projects/rt/4.4/patches-4.4-rc6-rt1.tar.xz
>

Additional note: RCU_BOOST now depends on RCU_EXPERT, so commit
3da4cab "rcu: make RCU_BOOST default on RT" is nop now.

config RCU_BOOST
	bool "Enable RCU priority boosting"
	depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
	default y if PREEMPT_RT_FULL

-- 
regards,
-grygorii

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#1315079

On 01/22/2016 04:35 PM, Grygorii Strashko wrote:
> Additional note: RCU_BOOST now depends on RCU_EXPERT, so commit
> 3da4cab "rcu: make RCU_BOOST default on RT" is nop now.
> 
> config RCU_BOOST
>     bool "Enable RCU priority boosting"
>     depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
>     default y if PREEMPT_RT_FULL

yeah, I've been thinking about giving the experts menu item an y on RT
as well.

Sebastian

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#1315271

* Sebastian Andrzej Siewior | 2016-01-22 16:48:09 [+0100]:

>On 01/22/2016 04:35 PM, Grygorii Strashko wrote:
>> Additional note: RCU_BOOST now depends on RCU_EXPERT, so commit
>> 3da4cab "rcu: make RCU_BOOST default on RT" is nop now.
>> 
>> config RCU_BOOST
>>     bool "Enable RCU priority boosting"
>>     depends on RT_MUTEXES && PREEMPT_RCU && RCU_EXPERT
>>     default y if PREEMPT_RT_FULL
>
>yeah, I've been thinking about giving the experts menu item an y on RT
>as well.

Subject: [PATCH] RCU: make RCU_EXPERT y on RT

because we want RCU_BOOST y on RT

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 init/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/init/Kconfig b/init/Kconfig
index 6f4408adf62d..a7c81c0911da 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -498,7 +498,7 @@ config TINY_RCU
 
 config RCU_EXPERT
 	bool "Make expert-level adjustments to RCU configuration"
-	default n
+	default y if PREEMPT_RT_FULL
 	help
 	  This option needs to be enabled if you wish to make
 	  expert-level adjustments to RCU configuration.  By default,
-- 
2.7.0.rc3

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