From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Davidlohr Bueso <davidlohr@hp.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
linuxppc-dev@lists.ozlabs.org,
LKML <linux-kernel@vger.kernel.org>,
paulus@samba.org, tglx@linutronix.de,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
torvalds@linux-foundation.org, mingo@kernel.org
Subject: Re: Tasks stuck in futex code (in 3.14-rc6)
Date: Thu, 20 Mar 2014 15:38:48 +0530 [thread overview]
Message-ID: <20140320100848.GC10406@linux.vnet.ibm.com> (raw)
In-Reply-To: <1395295019.2612.11.camel@buesod1.americas.hpqcorp.net>
> This problem suggests that we missed a wakeup for a task that was adding
> itself to the queue in a wait path. And the only place that can happen
> is with the hb spinlock check for any pending waiters. Just in case we
> missed some assumption about checking the hash bucket spinlock as a way
> of detecting any waiters (powerpc?), could you revert this commit and
> try the original atomic operations variant:
>
> https://lkml.org/lkml/2013/12/19/630
I think the above url and the commit id that I reverted i.e
git://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b0c29f79ecea0b6fbcefc999
are the same.
Or am I missing something?
--
Thanks and Regards
Srikar Dronamraju
WARNING: multiple messages have this Message-ID (diff)
From: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
To: Davidlohr Bueso <davidlohr@hp.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
torvalds@linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
paulus@samba.org, tglx@linutronix.de,
Paul McKenney <paulmck@linux.vnet.ibm.com>,
linuxppc-dev@lists.ozlabs.org, mingo@kernel.org
Subject: Re: Tasks stuck in futex code (in 3.14-rc6)
Date: Thu, 20 Mar 2014 15:38:48 +0530 [thread overview]
Message-ID: <20140320100848.GC10406@linux.vnet.ibm.com> (raw)
In-Reply-To: <1395295019.2612.11.camel@buesod1.americas.hpqcorp.net>
> This problem suggests that we missed a wakeup for a task that was adding
> itself to the queue in a wait path. And the only place that can happen
> is with the hb spinlock check for any pending waiters. Just in case we
> missed some assumption about checking the hash bucket spinlock as a way
> of detecting any waiters (powerpc?), could you revert this commit and
> try the original atomic operations variant:
>
> https://lkml.org/lkml/2013/12/19/630
I think the above url and the commit id that I reverted i.e
git://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b0c29f79ecea0b6fbcefc999
are the same.
Or am I missing something?
--
Thanks and Regards
Srikar Dronamraju
next prev parent reply other threads:[~2014-03-20 10:08 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-19 15:26 Tasks stuck in futex code (in 3.14-rc6) Srikar Dronamraju
2014-03-19 15:26 ` Srikar Dronamraju
2014-03-19 15:47 ` Peter Zijlstra
2014-03-19 15:47 ` Peter Zijlstra
2014-03-19 16:09 ` Srikar Dronamraju
2014-03-19 16:09 ` Srikar Dronamraju
2014-03-19 17:08 ` Peter Zijlstra
2014-03-19 17:08 ` Peter Zijlstra
2014-03-19 18:06 ` Davidlohr Bueso
2014-03-19 18:06 ` Davidlohr Bueso
2014-03-20 5:33 ` Srikar Dronamraju
2014-03-20 5:33 ` Srikar Dronamraju
2014-03-20 5:56 ` Davidlohr Bueso
2014-03-20 5:56 ` Davidlohr Bueso
2014-03-20 10:08 ` Srikar Dronamraju [this message]
2014-03-20 10:08 ` Srikar Dronamraju
2014-03-20 15:06 ` Davidlohr Bueso
2014-03-20 15:06 ` Davidlohr Bueso
2014-03-20 16:31 ` Davidlohr Bueso
2014-03-20 16:31 ` Davidlohr Bueso
2014-03-20 20:23 ` Benjamin Herrenschmidt
2014-03-20 20:23 ` Benjamin Herrenschmidt
2014-03-20 16:41 ` Linus Torvalds
2014-03-20 16:41 ` Linus Torvalds
2014-03-20 17:18 ` Davidlohr Bueso
2014-03-20 17:18 ` Davidlohr Bueso
2014-03-20 17:42 ` Linus Torvalds
2014-03-20 17:42 ` Linus Torvalds
2014-03-20 18:03 ` Davidlohr Bueso
2014-03-20 18:03 ` Davidlohr Bueso
2014-03-20 18:16 ` Linus Torvalds
2014-03-20 18:16 ` Linus Torvalds
2014-03-20 18:36 ` Linus Torvalds
2014-03-20 18:36 ` Linus Torvalds
2014-03-20 19:08 ` Davidlohr Bueso
2014-03-20 19:08 ` Davidlohr Bueso
2014-03-20 19:25 ` Linus Torvalds
2014-03-20 19:25 ` Linus Torvalds
2014-03-20 20:20 ` Davidlohr Bueso
2014-03-20 20:20 ` Davidlohr Bueso
2014-03-20 20:36 ` Linus Torvalds
2014-03-20 20:36 ` Linus Torvalds
2014-03-21 4:55 ` Srikar Dronamraju
2014-03-21 4:55 ` Srikar Dronamraju
2014-03-21 5:24 ` Linus Torvalds
2014-03-21 5:24 ` Linus Torvalds
2014-03-22 2:27 ` Srikar Dronamraju
2014-03-22 2:27 ` Srikar Dronamraju
2014-03-22 3:36 ` Davidlohr Bueso
2014-03-22 3:36 ` Davidlohr Bueso
2014-03-20 7:23 ` Peter Zijlstra
2014-03-20 7:23 ` Peter Zijlstra
2014-03-19 16:04 ` Linus Torvalds
2014-03-19 16:04 ` Linus Torvalds
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