From: Jeremy Fitzhardinge <jeremy@goop.org>
To: Daniel Stodden <daniel.stodden@citrix.com>
Cc: Xen <xen-devel@lists.xensource.com>, Tom Kopec <tek@acm.org>
Subject: Re: [PATCH] blkfront: Move blkif_interrupt into a tasklet.
Date: Wed, 08 Sep 2010 16:37:02 +1000 [thread overview]
Message-ID: <4C872F0E.5010809@goop.org> (raw)
In-Reply-To: <1283912499.3138.170.camel@agari.van.xensource.com>
On 09/08/2010 12:21 PM, Daniel Stodden wrote:
> On Tue, 2010-09-07 at 22:03 -0400, Jeremy Fitzhardinge wrote:
>> On 09/03/2010 09:08 AM, Daniel Stodden wrote:
>>> We clearly spin_lock_irqsave all through the blkif_do_interrupt frame.
>>>
>>> It follows that something underneath quite unconditionally chose to
>>> reenable them again (?)
>>>
>>> Either: Can you add a bunch of similar WARN_ONs along that path?
>>>
>>> Or: This lock is quite coarse-grained. The lock only matters for queue
>>> access, and we know irqs are reenabled, so no need for flags. In fact we
>>> only need to spin_lock_irq around the __blk_end_ calls and
>>> kick_pending_.
>>>
>>> But I don't immediately see what's to blame, so I'd be curious.
>> It looks like __blk_end_request_all(req, error); (line 743) is returning
>> with interrupts enabled sometimes (not consistently). I had a quick
>> look through the code, but I couldn't see where it touches the interrupt
>> state at all.
> Oha. Was this found on 2.6.32 or later?
Yeah, xen/next-2.6.32.
J
next prev parent reply other threads:[~2010-09-08 6:37 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-23 6:54 Fix the occasional xen-blkfront deadlock, when irqbalancing Daniel Stodden
2010-08-23 6:54 ` [PATCH] blkfront: Move blkif_interrupt into a tasklet Daniel Stodden
2010-08-23 7:01 ` Daniel Stodden
2010-09-02 22:46 ` Jeremy Fitzhardinge
2010-09-02 23:08 ` Daniel Stodden
2010-09-07 1:39 ` blktap lockdep hiccup Jeremy Fitzhardinge
2010-09-07 1:46 ` Daniel Stodden
2010-09-08 2:03 ` [PATCH] blkfront: Move blkif_interrupt into a tasklet Jeremy Fitzhardinge
2010-09-08 2:21 ` Daniel Stodden
2010-09-08 6:37 ` Jeremy Fitzhardinge [this message]
2010-09-23 16:08 ` Andrew Jones
2010-09-23 16:23 ` Jeremy Fitzhardinge
2010-09-23 16:38 ` Paolo Bonzini
2010-09-23 18:36 ` Jeremy Fitzhardinge
2010-09-24 7:14 ` Andrew Jones
2010-09-24 18:50 ` Jeremy Fitzhardinge
2010-09-27 7:41 ` Andrew Jones
2010-09-27 9:46 ` Daniel Stodden
2010-09-27 10:21 ` Andrew Jones
2011-08-16 11:26 ` imammedo
2011-08-16 14:57 ` Konrad Rzeszutek Wilk
2011-08-17 2:38 ` Konrad Rzeszutek Wilk
2011-08-17 7:30 ` Paolo Bonzini
2011-08-17 9:07 ` Igor Mammedov
2011-08-24 15:36 ` Konrad Rzeszutek Wilk
2011-08-24 16:36 ` Igor Mammedov
2011-08-29 19:46 ` Konrad Rzeszutek Wilk
2011-08-31 23:47 ` [PATCH] xen: x86_32: do not enable iterrupts when returning from exception in interrupt context Igor Mammedov
2011-08-31 23:47 ` Igor Mammedov
2011-08-31 22:37 ` Jeremy Fitzhardinge
2011-08-31 22:37 ` Jeremy Fitzhardinge
2011-09-01 8:19 ` Igor Mammedov
2011-09-01 11:46 ` [PATCH v2] " Igor Mammedov
2011-09-01 11:46 ` Igor Mammedov
2011-09-01 15:45 ` Konrad Rzeszutek Wilk
2011-09-01 16:46 ` Jeremy Fitzhardinge
2011-09-02 8:18 ` Igor Mammedov
2011-09-02 13:40 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-09-02 13:40 ` Konrad Rzeszutek Wilk
2011-09-02 14:01 ` [Xen-devel] " Igor Mammedov
2011-09-02 14:47 ` Konrad Rzeszutek Wilk
2011-09-02 14:47 ` Konrad Rzeszutek Wilk
2011-09-06 9:16 ` [Xen-devel] " Igor Mammedov
2011-09-06 9:16 ` Igor Mammedov
2011-09-02 9:19 ` Igor Mammedov
2011-09-02 10:00 ` Keir Fraser
2010-08-23 21:09 ` Fix the occasional xen-blkfront deadlock, when irqbalancing Jeremy Fitzhardinge
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