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From: "Steven Hartland" <killing@multiplay.co.uk>
To: "K. Macy" <kmacy@freebsd.org>
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Subject: Re: zfs pool import hangs on [tx->tx_sync_done_cv]
Date: Mon, 13 Oct 2014 20:14:30 +0100
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Cc: Mark Martinec <Mark.Martinec+freebsd@ijs.si>,
 "freebsd-fs@FreeBSD.org" <freebsd-fs@freebsd.org>,
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----- Original Message ----- 
From: "K. Macy" <kmacy@freebsd.org>
To: "Steven Hartland" <killing@multiplay.co.uk>
Cc: "Mark Martinec" <Mark.Martinec+freebsd@ijs.si>; "freebsd-fs@FreeBSD.org" <freebsd-fs@freebsd.org>; "FreeBSD Stable" 
<freebsd-stable@freebsd.org>
Sent: Monday, October 13, 2014 7:43 PM
Subject: Re: zfs pool import hangs on [tx->tx_sync_done_cv]


>>> A recent quick read of the code would lead me to believe that
>>
>> Yer I would have got the zio details but typically its "optimised out" by
>> the
>> compiler, so will need some effort to track that down unfortunately :(
>
> FYI it isn't actually optimized out. The debug info accounting just
> isn't very good about tracking the values in registers. You'll see in
> my last mail that just looking at the assembler makes it pretty
> obvious that zio was in %r14. HTH.
>
> Cheers.
>
>
> -K
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