Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule

From	Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Newsgroups	linux.kernel
Subject	Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule
Date	2016-04-07 18:50 +0200
Message-ID	<rlli2-6NG-19@gated-at.bofh.it> (permalink)
References	(3 earlier) <rgang-Yq-7@gated-at.bofh.it> <rgaZZ-1gK-33@gated-at.bofh.it> <riEqS-P8-21@gated-at.bofh.it> <rjeE2-1I4-15@gated-at.bofh.it> <rjkgq-5Ym-7@gated-at.bofh.it>
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On 04/02/2016 05:12 AM, Mike Galbraith wrote:
>> By the time I improved hotplug I played with this. I had a few ideas but
>> it didn't fly in the end. Today however I ended up with this:
> 
> Yeah, but that fails the duct tape test too.  Mine is below, and is the
> extra sticky variety ;-)  With busted 0299 patch reverted and those two
> applied, my DL980 took a beating for ~36 hours before I aborted it.. ie
> hotplug road seemingly has no more -rt specific potholes.

just to be clear: The patch I attached did _not_ work for you.

> If that lock dies, we can unpin when entering lock slow path and pin
> again post acquisition with no ABBA worries as well, and not only does
> existing hotplug work heaping truckloads better, -rt can perhaps help
> spot trouble as the rewrite proceeds.
> 
> Current state is more broken than ever.. if that's possible.

And the two patches you attached here did?

> 
> 	-Mike

Sebastian

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Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-07 18:50 +0200
  Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-07 21:10 +0200
    Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-08 12:40 +0200
      Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 14:20 +0200
  Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 08:40 +0200
  Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 15:50 +0200
    Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-08 16:00 +0200
      Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 16:20 +0200
        Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Sebastian Andrzej Siewior <bigeasy@linutronix.de> - 2016-04-08 17:00 +0200
          Re: [PATCH RT 4/6] rt/locking: Reenable migration accross schedule Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-04-08 18:50 +0200

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